阅读说明：本技术 一种扭簧助力中高压蒸汽疏水阀 (Torsion spring assisted medium-high pressure steam trap ) 是由 雷娟 李治辉 杜金明 杨芳军 于 2021-10-12 设计创作，主要内容包括：本发明公开一种扭簧助力中高压蒸汽疏水阀。本发明所述疏水阀包括阀盖和阀体组成阀壳,所述阀壳内设置有控制架、杠杆、浮球、阀座、阀芯、扭簧,杠杆的一端连接浮球,杠杆的另一端安装扭簧。本装置优点是结构中的扭簧易换,开阀压力调节范围广,中高压差下工作性能稳定、可靠,体积小；外置空气排放阀,内置蒸汽解锁阀,能消除空气气堵和蒸汽汽锁,安装方便,能够在线维修。(The invention discloses a torsion spring assisted medium-high pressure steam trap. The drain valve comprises a valve cover and a valve body which form a valve shell, wherein a control frame, a lever, a floating ball, a valve seat, a valve core and a torsion spring are arranged in the valve shell, one end of the lever is connected with the floating ball, and the other end of the lever is provided with the torsion spring. The device has the advantages that the torsion spring in the structure is easy to replace, the valve opening pressure adjusting range is wide, the working performance under the medium-high pressure difference is stable and reliable, and the volume is small; the external air discharge valve and the built-in steam unlocking valve can eliminate air blockage and steam lock, and the device is convenient to install and can be maintained on line.)

1. The utility model provides a high pressure steam trap in torsional spring helping hand, includes valve gap (1) and valve body (3) constitution valve casing, be provided with control frame (12), lever (6), floater (11), disk seat (18), case (20), torsional spring (22) in the valve casing, floater (11) are connected to the one end of lever (6), and torsional spring (22), its characterized in that are installed to the other end of lever (6):

an unlocking valve seat hole (29) is formed in the inner end face of the valve cover (1), and an unlocking valve seat (24) is installed in the unlocking valve seat hole (29); threads are arranged in the unlocking valve seat hole (29), and the threads in the unlocking valve seat hole (29) are matched with the unlocking valve seat (24); the unlocking valve seat hole (29) is communicated with an L-shaped flow passage hole (30), and the L-shaped flow passage hole (30) is communicated with a valve cover water outlet flow passage hole (33) through a valve cover flow passage connecting hole (31); a sealing gasket positioning hole (32) is formed in the opening of the L-shaped flow passage hole (30), and the sealing gasket positioning hole (32) is communicated with the inner cavity of the valve body (3);

one end of the valve body (3) is provided with a water inlet hole (38) communicated with the inner cavity of the valve body (3), and the other end of the valve body (3) is provided with a water outlet hole (39) communicated with a water outlet flow passage hole (33) of the valve cover; a water outlet flange (10-1) and a water inlet flange (10) are respectively welded at two ends of the valve body (3), and the water inlet flange (10) and the water outlet flange (10-1) are horizontally concentric;

a filter screen (4) is arranged in the valve body (3), and small holes which are uniformly distributed are formed in the filter screen (4); the control frame (12) is arranged in a cavity formed by the valve body (3) and the filter screen (4); valve body (3) top is equipped with evacuation valve seat hole (37), evacuation valve seat hole (37) and valve body (3) inner chamber switch-on are provided with the screw thread in evacuation valve seat hole (37), screw thread and evacuation valve seat (8) matching in the evacuation valve seat hole (37).

2. The torsion spring assisted medium and high pressure steam trap of claim 1, wherein: a valve seat hole (45) is formed in the control frame (12), and a valve seat (18) is arranged in the valve seat hole (45); the bottom hole of the valve seat hole (45) is communicated with the water outlet hole (40) of the control frame; the inner wall of the valve seat hole (45) is provided with threads, and the threads of the valve seat hole (45) are matched with the valve seat (18);

the left side and the right side of the control frame (12) are symmetrically provided with two cantilevers which are respectively a control frame suspension wall a (41) and a control frame suspension wall b (41-1); a suspension wall through hole a (42) is arranged on the suspension wall a (41) of the control frame, and a suspension wall through hole b (42-1) is arranged on the suspension wall b (41-1) of the control frame; a valve core through hole (50) is formed in the lever (6), a valve core (20) is arranged in the hole, and the position of the valve core is limited by a split washer (21); the left side and the right side of the lever (6) are symmetrically provided with two side wings, namely a lever cantilever a (48) and a lever cantilever b (48-1), and through holes (49) are formed in the lever cantilever a (48) and the lever cantilever b (48-1); the pin shaft (23) sequentially penetrates through the suspended wall through hole a (42), the lever cantilever a (48), the lever cantilever b (48-1) and the suspended wall through hole b (42-1), and the other end of the pin shaft (23) is fixed by a cotter pin (52); the lever (6) is welded with the floating ball (11); a torsion spring fixing hole (43) is formed in the suspension wall b (41-1) of the control frame; one end of the torsion spring (22) is a torsion spring fixed end (27) which is inserted into the torsion spring fixed hole (43) for fixation, and the other end is a torsion spring acting end (28) which is supported on the bottom surface of the lever (6); the spiral center of the torsion spring (22) is a torsion spring hole (26), and the pin shaft (23) also penetrates through the torsion spring hole (26).

3. The torsion spring assisted medium and high pressure steam trap of claim 2, wherein: a screw plug pad (9) is arranged between the emptying valve seat (8) and the valve body (3); and a screw plug pad (25) is arranged between the unlocking valve (24) and the valve cover (1).

4. The torsion spring assisted medium and high pressure steam trap of claim 3, wherein: a step emptying hole (53) is formed in the center of the emptying valve seat (8), a conical sealing hole (54) is formed in the opening of the step emptying hole (53), and the conical sealing hole (54) is matched with a sealing surface (56) on the emptying valve core (7) to form line sealing; the emptying valve core (7) is provided with external threads which are matched with threaded holes formed in the emptying valve seat (8); and a small exhaust through hole (55) is formed in the side wall of the evacuation valve seat (8), and the small exhaust through hole (55) is communicated with a cavity formed by the evacuation valve seat (8) and the evacuation valve core (7).

5. The torsion spring assisted medium and high pressure steam trap of claim 4, wherein: the center of the valve seat (18) is provided with a step liquid drainage through hole (47), the small end of the step liquid drainage through hole (47) is in contact seal with the valve core (20), and the large end is communicated with the water outlet flow passage through hole (40).

6. The torsion spring assisted medium and high pressure steam trap of claim 5, wherein: the unlocking valve seat (24) is provided with a labyrinth small through hole (57), one end of the labyrinth small through hole (57) is communicated with the valve cavity, the other end of the labyrinth small through hole is communicated with the valve cover L-shaped flow channel hole (30), and then the labyrinth small through hole is communicated with the valve body water outlet hole (39) through the flow channel connecting hole (31) and the valve cover water outlet flow channel hole (33).

7. The torsion spring assisted medium and high pressure steam trap of claim 6, wherein: the control frame (12) is provided with a screw through hole (44) through the control frame, and the control frame (12) and the valve cover (1) are fixed by penetrating through the screw through hole (44) through a screw (13); a sealing gasket (14) is arranged between the control frame (12) and the valve cover (1); the end face of the valve cover (1) is provided with a wrapping groove a (32) for placing a sealing gasket (14); a sealing gasket (19) is arranged between the valve seat (18) and the control frame (12); and the end surface of the control frame (12) is provided with a wrapping groove b (46) for placing a sealing gasket (19).

8. The torsion spring assisted medium and high pressure steam trap of claim 7, wherein: a sealing gasket (2) is arranged between the valve cover (1) and the valve body (3), a covered edge groove c (36) for placing the sealing gasket (2) is formed in the end face of the valve body (3), and a water outlet through hole is formed in the position, corresponding to the valve cover water outlet flow passage through hole (33) and the valve body water outlet hole (39), of the sealing gasket (2).

9. The torsion spring assisted medium and high pressure steam trap of claim 8, wherein: the end face of the valve cover (1) is provided with a valve cover bolt through hole (35), and the end face of the valve body (3) is provided with a valve body bolt through hole (35-1); valve gap bolt through-hole (35) correspond with valve body bolt through-hole (35-1), run through stud (17) between valve gap bolt through-hole (35) and valve body bolt through-hole (35-1), stud (17) are fixed through the I type hexagon nut (16) rather than matching, be provided with spring washer (15) between I type hexagon nut (16) and valve gap (1).

Technical Field

The invention relates to a special valve with stable and reliable working performance and adjustable valve opening pressure under medium-high pressure difference, belongs to the field of steam trap valves, and particularly relates to a torsion spring assisted medium-high pressure steam trap valve.

Background

With the continuous deep development of the country on the energy-saving and emission-reducing work, the lever floating ball type steam trap has wide usability as a self-operated trap. Different forms of drain valves are selected under different working conditions, at present, the known lever floating ball type steam drain valve has two structural forms of a single valve seat and a double valve seat, the double valve seat sealing is difficult to realize the simultaneous sealing of the two valve seats, and the air leakage is large generally; the single valve seat is sealed under medium-high pressure difference, the static pressure of a valve opening is multiplied along with the increase of the pressure difference, the required valve opening force is correspondingly increased, and a lever is lengthened or the diameter of a floating ball is increased for opening the valve, so that the volume of the drain valve is increased; and increase the floater diameter, in order to guarantee the bearing strength of floater, the wall thickness just must increase, and the weight of floater increases thereupon, causes the trap to open the difficulty, leads to trap unable normal work. At present, a single-valve-seat lever floating ball type steam trap with the pressure difference of more than 6.5MPa.G is not available at home and abroad, so that the requirement of selecting a trap for small-volume high-pressure-difference steam heating equipment cannot be met.

Disclosure of Invention

The invention aims to provide a torsion spring assisted medium-high pressure steam trap, which can realize stable and reliable work under the pressure difference of more than 6.5MPa.G, has small volume, can eliminate air blockage and steam lock, is convenient to install and can be maintained on line.

In order to achieve the purpose, the torsion spring power-assisted medium-high pressure steam trap valve comprises a valve cover and a valve body which form a valve shell, wherein a control frame, a lever, a floating ball, a valve seat, a valve core and a torsion spring are arranged in the valve shell, one end of the lever is connected with the floating ball, and the other end of the lever is provided with the torsion spring;

an unlocking valve seat hole is formed in the inner end face of the valve cover, and an unlocking valve seat is arranged in the unlocking valve seat hole; threads are arranged in the unlocking valve seat hole, and the threads in the unlocking valve seat hole are matched with the unlocking valve seat; the unlocking valve seat hole is communicated with the L-shaped runner hole, and the L-shaped runner hole is communicated with the valve cover water outlet runner hole through the valve cover runner connecting hole; the opening part of the L-shaped flow passage is provided with a sealing gasket positioning hole which is communicated with the inner cavity of the valve body;

one end of the valve body is provided with a water inlet hole communicated with the inner cavity of the valve body, and the other end of the valve body is provided with a water outlet hole communicated with a water outlet flow passage hole of the valve cover; a water outlet flange and a water inlet flange are respectively welded at the two ends of the valve body, and the water inlet flange and the water outlet flange are horizontally concentric;

a filter screen is arranged in the valve body, and small holes which are uniformly distributed are formed in the filter screen; the control frame is arranged in a cavity formed by the valve body and the filter screen; the valve body top is equipped with evacuation disk seat hole, evacuation disk seat hole and valve body inner chamber switch-on are provided with the screw thread in the evacuation disk seat hole, the screw thread in the evacuation disk seat hole matches with the evacuation disk seat.

The control frame is provided with a valve seat hole, and a valve seat is arranged in the valve seat hole; the bottom hole of the valve seat hole is communicated with the water outlet hole of the control frame; the inner wall of the valve seat hole is provided with threads, and the threads of the valve seat hole are matched with the valve seat;

the left side and the right side of the control frame are symmetrically provided with two cantilevers which are respectively a control frame suspension wall a and a control frame suspension wall b; a suspension wall through hole a is formed in the suspension wall a of the control frame, and a suspension wall through hole b is formed in the suspension wall b of the control frame; the lever is provided with a valve core through hole, a valve core is arranged in the hole and limited by a split retainer ring; the left side and the right side of the lever are symmetrically provided with two side wings which are a lever cantilever a and a lever cantilever b respectively, and through holes are formed in the lever cantilever a and the lever cantilever b; the pin shaft sequentially penetrates through the suspension wall through hole a, the lever cantilever b and the suspension wall through hole b, and the other end of the pin shaft is fixed by a cotter pin; the lever is welded with the floating ball; a torsional spring fixing hole is formed in the suspension wall b of the control frame; one end of the torsion spring is a torsion spring fixed end which is inserted into the torsion spring fixed hole for fixation, and the other end of the torsion spring is a torsion spring acting end which is supported on the bottom surface of the lever; the center of the torsion spring spiral is a torsion spring hole, and the pin shaft penetrates through the torsion spring hole.

A screw plug pad is arranged between the emptying valve seat and the valve body; and a screw plug pad is arranged between the unlocking valve and the valve cover.

A step emptying hole is formed in the center of the emptying valve seat, a conical sealing hole is formed in the opening of the step emptying hole, and the conical sealing hole is matched with a sealing surface on the emptying valve core to form line sealing; the emptying valve core is provided with external threads which are matched with threaded holes formed in the emptying valve seat; and the side wall of the emptying valve seat is provided with a small exhaust through hole which is communicated with a cavity formed by the emptying valve seat and the emptying valve core.

The center of the valve seat is provided with a step liquid drainage through hole, the small end of the step liquid drainage through hole is in contact seal with the valve core, and the large end of the step liquid drainage through hole is communicated with the water outlet flow passage through hole.

The unlocking valve seat is provided with a labyrinth small through hole, one end of the labyrinth small through hole is communicated with the valve cavity, the other end of the labyrinth small through hole is communicated with the L-shaped runner hole of the valve cover, and then the labyrinth small through hole is communicated with the water outlet hole of the valve body through the water outlet runner hole of the valve cover through the runner connecting hole.

The control frame is provided with a screw through hole, and the control frame and the valve cover are fixed by penetrating through the screw through hole through a screw; a sealing gasket is arranged between the control frame and the valve cover; the end face of the valve cover is provided with a wrapping groove a for placing a sealing gasket; a sealing gasket is arranged between the valve seat and the control frame; and the end surface of the control frame is provided with a covered edge groove b for placing a sealing gasket.

A sealing gasket is arranged between the valve cover and the valve body, an edge covering groove c for placing the sealing gasket is arranged on the end face of the valve body, and a water outlet through hole is formed in the position, corresponding to the water outlet hole of the valve cover, of the sealing gasket, and the water outlet through hole is formed in the position, corresponding to the water outlet hole of the valve body, of the sealing gasket.

The end face of the valve cover is provided with a valve cover bolt through hole, and the end face of the valve body is provided with a valve body bolt through hole; the valve bonnet bolt through-hole corresponds with valve body bolt through-hole, run through stud between valve bonnet bolt through-hole and the valve body bolt through-hole, stud is fixed through the I type hexagon nut rather than matcing, be provided with spring washer between I type hexagon nut and the valve bonnet.

The torsion spring power-assisted medium-high pressure steam trap has the beneficial effects that: the invention is suitable for a middle-high pressure difference saturated steam main pipe, a heat tracing pipeline, a steam conveying pipeline and steam indirect heating equipment. The torsion spring is used for assisting in balancing the opening static pressure of the drain valve under high pressure difference, and the problems that the static pressure is large above 6.5MPa.G, and the drain valve is difficult to open can be effectively solved. The torsion spring is easy to change, the valve opening pressure adjusting range is wide, and the working performance is stable and reliable; the volume is small. The external air discharge valve can eliminate air blockage and can be started quickly; the steam lock release valve is arranged in the steam lock release device, so that steam lock can be eliminated, and the steam lock release device works stably; the installation is convenient, and the online maintenance can be realized.

Drawings

FIG. 1 is a schematic cross-sectional view of the structure of the present invention;

FIG. 2 is a left side view of FIG. 1;

fig. 3 is a schematic structural view of the valve cover 1 in fig. 1;

FIG. 4 is a schematic cross-sectional view of FIG. 3

FIG. 5 is a schematic sectional view of the valve body 3 in FIG. 1;

FIG. 6 is a schematic cross-sectional view of the top view structure of FIG. 5;

FIG. 7 is an enlarged view of a portion of FIG. 1 at A;

FIG. 8 is a left side view of FIG. 7;

FIG. 9 is a schematic structural view of the torsion spring 22 of FIG. 7;

FIG. 10 is a top view of FIG. 9;

FIG. 11 is a schematic structural view of the control frame 12 of FIG. 7;

FIG. 12 is a left side view of FIG. 11;

FIG. 13 is a schematic view of the structure of the lever 6 in FIG. 7;

FIG. 14 is a left side view of FIG. 13;

FIG. 15 is a schematic view of air, non-condensable gas, steam, low temperature condensed water and high temperature condensed water in a cavity of a torsion spring assisted medium-high pressure trap of the present invention;

FIG. 16 is a schematic view of the initial removal of cold air and non-condensable gases in accordance with the principles of the present invention;

FIG. 17 is a schematic view showing the valve-closed state of the exhaust valve when steam and high-temperature condensed water enter in the working principle of the present invention;

FIG. 18 is a schematic view showing the state of the float floating and the valve opening in the working principle of the present invention;

FIG. 19 is a schematic view showing the operation principle of the present invention, wherein the float ball is reset and the valve is closed;

in the figure: 1-valve cover, 2-middle flange sealing gasket, 3-valve body, 4-filter screen, 5-lifting ring, 6-lever, 7-emptying valve core, 8-emptying valve seat, 9-emptying valve sealing gasket, 10-inlet flange, 10-1-outlet flange, 11-floating ball, 12-control frame, 13-screw, 14-control frame sealing gasket, 15-spring washer, 16-hexagon nut, 17-stud, 18-valve seat, 19-valve seat sealing gasket, 20-valve core, 21-open retainer ring, 22-torsion spring, 23-pin shaft, 24-unlocking valve seat, 25-unlocking valve seat sealing gasket, 26-torsion spring inner hole, 27-torsion spring fixed end, 28-torsion spring action end, 29-unlocking valve seat hole, etc, 30-L-shaped flow passage hole, 31-flow passage connecting hole, 32-edge covering groove a, 33-valve cover water outlet flow passage hole, 34-control frame connecting threaded hole, 35-valve cover bolt connecting hole, 36-edge covering groove c, 37-emptying valve seat hole, 38-valve body water inlet hole, 39-valve body water outlet hole, 40-control frame water outlet hole, 41-control frame suspension wall a, 41-1-control frame suspension wall b, 42-suspension wall through hole a, 42-1-suspension wall through hole b, 43-torsion spring fixing hole, 44-control frame connecting hole, 45-valve seat hole, 46-edge covering groove b, 47-valve seat step liquid discharge hole, 48-lever suspension arm a, 48-1-lever suspension wall b, 49-lever suspension wall through hole, 50-valve core through hole, 51-floating ball connecting end, 52-split pin, 53-step emptying hole, 54-conical sealing hole, 55-small exhaust through hole, 56-emptying valve core sealing surface and 57-small labyrinth through hole.

Detailed Description

Example 1

As shown in fig. 1-19, the torsion spring assisted medium-high pressure steam trap of the present invention comprises a valve cover 1 and a valve body 3, which form a valve casing, wherein a control frame 12, a lever 6, a floating ball 11, a valve seat 18, a valve core 20 and a torsion spring 22 are arranged in the valve casing, one end of the lever 6 is connected with the floating ball 11, and the other end of the lever 6 is provided with the torsion spring 22; an unlocking valve seat hole 29 is formed in the inner end face of the valve cover 1, and an unlocking valve seat 24 is arranged in the unlocking valve seat hole 29; threads are arranged in the unlocking valve seat hole 29, and the threads in the unlocking valve seat hole 29 are matched with the unlocking valve seat 24; the unlocking valve seat hole 29 is communicated with an L-shaped runner hole 30, and the L-shaped runner hole 30 is communicated with a valve cover water outlet runner hole 33 through a valve cover runner connecting hole 31; a sealing gasket positioning hole 32 is arranged at the opening part of the L-shaped flow passage hole 30, and the sealing gasket positioning hole 32 is communicated with the inner cavity of the valve body 3;

one end of the valve body 3 is provided with a water inlet hole 38 communicated with the inner cavity of the valve body 3, and the other end of the valve body 3 is provided with a water outlet hole 39 communicated with a valve cover water outlet flow passage hole 33; a water outlet flange 10-1 and a water inlet flange 10 are respectively welded at two ends of the valve body 3, and the water inlet flange 10 and the water outlet flange 10-1 are horizontally concentric;

a filter screen 4 is arranged in the valve body 3, and small holes which are uniformly distributed are formed in the filter screen 4; the control frame 12 is arranged in a cavity formed by the valve body 3 and the filter screen 4; the top of the valve body 3 is provided with an emptying valve seat hole 37, the emptying valve seat hole 37 is communicated with the inner cavity of the valve body 3, threads are arranged in the emptying valve seat hole 37, and the threads in the emptying valve seat hole 37 are matched with the emptying valve seat 8.

A valve seat hole 45 is formed in the control frame 12, and a valve seat 18 is arranged in the valve seat hole 45; the bottom hole of the valve seat hole 45 is communicated with the control frame water outlet hole 40; the inner wall of the valve seat hole 45 is provided with threads, and the threads of the valve seat hole 45 are matched with the valve seat 18;

the left side and the right side of the control frame 12 are symmetrically provided with two cantilevers which are respectively a control frame suspension wall a41 and a control frame suspension wall b 41-1; a suspension wall through hole a42 is formed in the suspension wall a41 of the control frame, and a suspension wall through hole b42-1 is formed in the suspension wall b41-1 of the control frame; a valve core through hole 50 is formed in the lever 6, a valve core 20 is arranged in the hole, and the position is limited by a split retainer ring 21; the left side and the right side of the lever 6 are symmetrically provided with two side wings, namely a lever cantilever a48 and a lever cantilever b48-1, and through holes 49 are formed in the lever cantilever a48 and the lever cantilever b 48-1; the pin shaft 23 sequentially penetrates through the suspended wall through hole a42, the lever cantilever a48, the lever cantilever b48-1 and the suspended wall through hole b42-1, and the other end of the pin shaft 23 is fixed by a cotter pin 52; the lever 6 is welded with the floating ball 11; a torsion spring fixing hole 43 is formed in the suspension wall b41-1 of the control frame; one end of the torsion spring 22 is a torsion spring fixed end 27 which is inserted into the torsion spring fixed hole 43 for fixing, and the other end is a torsion spring acting end 28 which is supported on the bottom surface of the lever 6; the spiral center of the torsion spring 22 is a torsion spring hole 26, and the pin shaft 23 also penetrates through the torsion spring hole 26; when the drain valve works normally, a certain supporting force is given to the lever to help balance the static opening pressure of the drain valve under high pressure difference, and the drain valve is opened easily; the torsion spring is easy to replace, and the differential pressure of the opened valve can be adjusted.

A screw plug pad 9 is arranged between the emptying valve seat 8 and the valve body 3; a screw plug pad 25 is arranged between the unlocking valve 24 and the valve cover 1.

A step emptying hole 53 is formed in the center of the emptying valve seat 8, a conical sealing hole 54 is formed in the opening of the step emptying hole 53, and the conical sealing hole 54 is matched with a sealing surface 56 on the emptying valve core 7 to form line sealing; the emptying valve core 7 is provided with external threads which are matched with threaded holes formed in the emptying valve seat 8; and a small exhaust through hole 55 is formed in the side wall of the emptying valve seat 8, and the small exhaust through hole 55 is communicated with a cavity formed by the emptying valve seat 8 and the emptying valve core 7.

The center of the valve seat 18 is provided with a step drainage through hole 47, the small end of the step drainage through hole 47 is in contact seal with the valve core 20, and the large end is communicated with the water outlet flow passage through hole 40.

The unlocking valve seat 24 is provided with a labyrinth small through hole 57, and the labyrinth small through hole 57 has the following functions: a small amount of steam is changed into condensate through the small labyrinth holes, so that the valve cavity is kept smooth, steam lock is eliminated, and the drain valve continuously works; one end of the labyrinth small through hole 57 is communicated with the valve cavity, and the other end is communicated with the valve cover L-shaped flow passage hole 30, and further communicated with the valve body water outlet hole 39 through the valve cover water outlet flow passage hole 33 through the flow passage connecting hole 31.

The control frame 12 is provided with a screw through hole 44 through which the control frame 12 and the valve cover 1 are fixed by a screw 13 penetrating the screw through hole 44; a sealing gasket 14 is arranged between the control frame 12 and the valve cover 1; the end face of the valve cover 1 is provided with a wrapping groove a32 for placing a sealing gasket 14, so that the position of the sealing gasket 14 is prevented from deviating when the control frame 12 is connected with the valve cover 1; a sealing gasket 19 is arranged between the valve seat 18 and the control frame 12; the end face of the control frame 12 is provided with a wrapping groove b46 for placing the sealing gasket 19, so that the sealing gasket 19 is prevented from deviating when the valve seat 18 is connected with the control frame 12.

A sealing gasket 2 is arranged between the valve cover 1 and the valve body 3, an edge-covering groove c36 for placing the sealing gasket 2 is arranged on the end face of the valve body 3, so that the position deviation of the sealing gasket 2 is prevented when the valve body 3 is connected with the valve cover 1, and a water outlet through hole is formed in the sealing gasket 2 at the position corresponding to the valve cover water outlet flow passage through hole 33 and the valve body water outlet hole 39; the filter screen 4 plays a role in filtering impurities on one hand and plays a certain role in protecting the floating ball 11 on the other hand, so that direct impact of high-speed liquid flow on the floating ball 11 is prevented; the floating ball 11 has high compression strength, good sealing performance and corrosion resistance.

The end face of the valve cover 1 is provided with a valve cover bolt through hole 35, and the end face of the valve body 3 is provided with a valve body bolt through hole 35-1; the valve cover bolt through hole 35 corresponds to the valve body bolt through hole 35-1, the stud 17 penetrates through the valve cover bolt through hole 35 and the valve body bolt through hole 35-1, the stud 17 is fixed through the I-shaped hexagon nut 16 matched with the stud 17, and the spring washer 15 is arranged between the I-shaped hexagon nut 16 and the valve cover 1.

After the invention is installed on the pipeline, the operation is automatically started as shown in the schematic diagrams of fig. 15, 16, 17, 18 and 19: when the valve is started again for the first time or when the valve is stopped, firstly, the inlet valve is slowly opened, air or a mixture of non-condensable gas and condensed water in the pipeline passes through the water inlet flange 10 at the left end of the valve body 3 and enters the inner cavity of the valve body 1 through the water inlet hole 38 of the valve body, and then the valve core 7 of the drain valve is manually opened, so that the air or the mixture of non-condensable gas and condensed water entering the drain valve rapidly passes through the step drain hole 53 of the drain valve seat 8 and the tapered sealing hole 54 and is discharged from the small exhaust through hole 55; as shown in fig. 14;

then the emptying valve core 7 is manually closed, so that the emptying valve core sealing surface 56 is in contact with the conical sealing hole 54 for sealing; at this time, the more the condensed liquid entering the inner cavity of the valve body 3 gathers, the drain valve of the invention is closed, as shown in figure 15;

then, a large amount of high-temperature condensed water which flows in starts to gather in the valve shell, the floating ball 7 floats upwards under the action of buoyancy and leaves the orifice 38, and the condensed water is rapidly discharged from the step liquid discharge through hole 31 of the emptying valve seat 8 through the water discharge orifice 39, the water outlet flow passage hole 19, the water outlet through hole 37, the water outlet flow passage key groove-shaped through hole 43 and the water outlet hole 42 in sequence, which is shown in figure 16;

as the liquid level decreases, the floating ball 7 continues to contact the orifice 38 again, and the trap of the present invention is closed, see fig. 17;

when the condensed water continues to flow, the water level in the valve casing rises, the floating ball 7 rises away from the opening 38, the trap of the present invention is opened, and the condensed water is removed, as shown in fig. 18;

and then the opening of the orifice 38 is automatically adjusted along with the inflow of the condensed water, so that the floating ball 7 moves up and down, the proportional continuous drainage is realized, and no condensed water is accumulated in the equipment, thereby maintaining the stable process temperature and ensuring the highest production efficiency of the equipment. And this operation is repeated cyclically.

When the back pressure of the trap rises and there is backflow of condensate, the condensate will push the check valve spool 10 to move to close the drain opening 39, functioning as a check valve, see fig. 19.

In summary, the following steps: the three-point supporting floating ball structure is adopted, the size proportion is accurate, the liquid is accurately discharged, the floating ball is always forced to roll to the orifice 38 under the support of other two points to form three-point support, the sealing performance is good, the drain valve has the advantages of less air leakage or no air leakage, the working performance is stable and reliable, the valve seat erosion caused by poor sealing is reduced, and the service life is prolonged;

the check valve core is arranged in the flow channel of the emptying valve seat 8, has a check function, can effectively prevent condensate from flowing back to form water hammer to damage the interior of the floating ball drain valve body, and can stably play a role in steam resistance and water drainage;

the invention adopts the U-shaped bimetallic strip to remove air, prevents air blockage, is quick to start and can continuously discharge condensed water.