阅读说明：本技术 一种压力可调式自力式压力调节阀及其使用方法 (Pressure-adjustable self-operated pressure regulating valve and use method thereof ) 是由 沈必亮 李聪 王晓春 何一军 丁学良 姚文亮 于 2021-06-29 设计创作，主要内容包括：本发明公开了一种压力可调式自力式压力调节阀及其使用方法,涉及调节阀技术领域,包括阀体、连接管、气缸筒、气压缸、推进缸,所述阀体两侧固定连接有对称的连接管,在管道对接到密封槽上,旋转夹紧螺栓减小移动块与压紧片的间隙,夹紧环紧固在管道上,推进螺栓在收紧柱上旋转,带动移动块向连接管方向运动,将管道插入密封槽固定,在推进柄推进固定块,将固定块上的旋转卡条移动,旋转卡条运动到不同限位槽压力仓内为不同压力等级,在旋转卡条的上表面对应限位槽的上表面处,旋转四个旋转卡条,将其上表面贴合限位槽上表面固定。本发明阀体安装方便,压力调节阀的压力可进行调整,适应性强,可作用于不同的工作环境,实用性强,适合推广。(The invention discloses a pressure adjustable self-operated pressure regulating valve and a use method thereof, and relates to the technical field of regulating valves. The valve body is convenient to install, the pressure of the pressure regulating valve can be regulated, the adaptability is strong, the valve body can act on different working environments, the practicability is strong, and the valve body is suitable for popularization.)

1. A pressure adjustable self-operated pressure regulating valve comprises a valve body (1), a connecting pipe (2), a cylinder barrel (13), a pneumatic cylinder (14) and a propelling cylinder (15), it is characterized in that two sides of the valve body (1) are fixedly connected with symmetrical connecting pipes (2), a sealing groove (36) is arranged on the outer side of the connecting pipe (2), a fixing ring (3) is fixedly arranged on the surface of the connecting pipe (2), tightening columns (6) are uniformly and fixedly arranged on the fixing ring (3), the surfaces of the tightening columns (6) are provided with pushing threads (37), a moving block (7) is arranged on the tightening column (6) in a sliding way, the other side of the moving block (7) is connected with a pushing bolt (9) which is connected with the tightening column (6) through a thread in a sliding way, two sides of the moving block (7) are connected with clamping pieces (38) through clamping bolts (10), and the clamping pieces (38) are fixedly connected with clamping rings (8);

a propelling column (16) is arranged in the propelling cylinder (15), a propelling handle (17) is fixedly arranged at one end of the propelling column (16) positioned outside the propelling cylinder (15), a fixing block (22) is fixedly connected at the other end of the propelling column (16), an air pressure column (23) is fixedly connected to the lower surface of the fixing block (22), an air pressure plug (24) is fixedly connected at the other end of the air pressure column (23), the air pressure plug (24) is positioned in a pressure chamber (25) of the air pressure cylinder (14), the air pressure cylinder (14) is fixedly connected with a cylinder barrel (13), the pressure chamber (25) is hermetically connected with a motion chamber (28), a piston rod (26) is arranged in the motion chamber (28) in a sliding manner, a piston (27) is fixedly arranged on the upper surface of the piston rod (26), a valve rod (30) is fixedly connected at the other end of the piston rod (27), and a dust ring (29) is fixedly arranged at the connecting position of the piston rod (27) positioned on the valve rod (30), the lower surface of the cylinder barrel (13) is fixedly connected with a connecting flange (11), the connecting flange (11) is connected with a connecting pipe (5) through a fixing bolt (12), a guide sleeve (31) is fixedly arranged in the connecting pipe (5), the valve rod (30) penetrates through the guide sleeve (31), a valve seat (33) which is separated from the valve body (1) is fixedly arranged on the valve body (1), and a valve hole (40) is formed in the position, corresponding to the valve rod (30), of the valve seat (33). A valve seat core (32) matched with the valve rod (30) is fixedly arranged at the valve hole (40);

the position that impels jar (15) to correspond fixed block (22) is equipped with spout (18), spout (18) one side is fixed to be equipped with length and rather than assorted stopper (19), stopper (19) are gone up even and are equipped with spacing groove (20), fixed block (22) are located one side of spout (18) and are fixed to be equipped with spacing axle (39), spacing axle (39) are connected with rotatory card strip (21) through the pivot, the thickness and the spacing groove (20) phase-match of rotatory card strip (21).

2. The pressure-adjustable self-operated pressure regulating valve as claimed in claim 1, wherein a gap is formed between the clamping piece (38) and the moving block (7) through a clamping bolt (10), the clamping ring (8) has toughness, friction lines are formed on the inner side surface of the clamping ring, the sealing groove (36) is matched with a pipeline connected with the connecting pipe (2), and a sealing gasket is arranged inside the sealing groove.

3. Pressure-regulating self-operated pressure regulating valve according to claim 1, characterized in that the pressure plug (24) is connected in a sealing manner to the inside of the pressure chamber (25) and the piston (27) is connected in a sealing manner to the inside of the motion chamber (28).

4. The pressure-adjustable self-operated pressure regulating valve as claimed in claim 1, wherein the dust ring (29) is slidably connected to the inner side wall of the motion cabin (28), and a water retaining ring is arranged in the guide sleeve (31).

5. The pressure-adjustable self-operated pressure regulating valve according to claim 1, wherein a stabilizing seat (4) is fixedly arranged on the lower surface of the valve body (1), a stabilizing groove (34) is formed in the position, corresponding to the piston rod (26), of the stabilizing seat (4) in the valve body (1), and a stabilizing column (35) is fixedly arranged in the position, corresponding to the stabilizing groove (34), of the piston rod (26).

6. The method of claim 1, comprising the steps of:

1) installation: the pipeline is butted to the sealing groove (36), the gap between the moving block (7) and the pressing piece (38) is reduced by rotating the clamping bolt (10), the clamping ring (8) is fastened on the pipeline, the pushing bolt (9) rotates on the tightening column (6), the moving block (7) is driven to move towards the direction of the connecting pipe (2), and the pipeline is inserted into the sealing groove (36) and fixed.

2) Adjusting pressure: the fixed block (22) is pushed by the pushing handle (17), the rotary clamping strip (21) on the fixed block (22) is moved, the upper surface of the rotary clamping strip (21) corresponds to the upper surface of the limiting groove (20), and the rotary clamping strip (21) moves to different pressure bins (25) of the limiting groove (20) to form different pressure levels.

3) Fixing: the position of the pushing handle (17) is kept unchanged at the position, corresponding to the upper surface of the limiting groove (20), of the upper surfaces of the rotating clamping strips (21), the upper surfaces of the four rotating clamping strips (21) are attached to the upper surface of the limiting groove (20), and the inner arc surfaces of the four rotating clamping strips are attached to the outer side surface of the pushing cylinder (15).

7. The use method of the pressure-adjustable self-operated pressure regulating valve according to claim 6, wherein the upper surface of the rotary clamping strip (21) is provided with friction lines corresponding to the upper surface of the limiting groove (20), the limiting shaft (39) is made of steel, and lubricating oil is coated on the limiting shaft (39).

Technical Field

The invention belongs to the technical field of regulating valves, and particularly relates to a pressure-adjustable self-operated pressure regulating valve and a using method thereof.

Background

The self-operated pressure regulating valve is divided into three series of self-operated pressure, pressure difference and flow regulating valves. The self-operated pressure regulating valve is divided into a front valve type and a rear valve type according to the position of a pressure taking point, when the pressure taking point is in front of the valve, the pressure taking point is used for regulating the pressure in front of the valve to be constant, and when the pressure taking point is behind the valve, the pressure taking point is used for regulating the pressure behind the valve to be constant; the existing self-operated pressure regulating valve generally provides pressure of the valve on the valve seat through a spring, and when the pressure acting on the valve exceeds a certain value, the valve is opened to regulate the internal pressure of a pipeline.

Disclosure of Invention

The invention aims to provide a pressure-adjustable self-operated pressure regulating valve and a use method thereof.

The invention provides the following technical scheme: a pressure-adjustable self-operated pressure regulating valve comprises a valve body, connecting pipes, a cylinder barrel, a pneumatic cylinder and a pushing cylinder, wherein the two sides of the valve body are fixedly connected with the symmetrical connecting pipes, sealing grooves are formed in the outer sides of the connecting pipes, fixing rings are fixedly arranged on the surfaces of the connecting pipes, tightening columns are uniformly and fixedly arranged on the fixing rings, pushing threads are arranged on the surfaces of the tightening columns, moving blocks are arranged on the tightening columns in a sliding mode, pushing bolts which are connected to the tightening columns through threads are connected to the other sides of the moving blocks in a sliding mode, the two sides of each moving block are connected with clamping pieces through clamping bolts, and the clamping pieces are fixedly connected with clamping rings;

a propelling column is arranged in the propelling cylinder, a propelling handle is fixedly arranged at one end of the propelling column, which is positioned outside the propelling cylinder, a fixed block is fixedly connected at the other end of the propelling column, a pneumatic column is fixedly connected at the lower surface of the fixed block, a pneumatic plug is fixedly connected at the other end of the pneumatic column, the pneumatic plug is positioned in a pressure bin of the pneumatic cylinder, the pneumatic cylinder is fixedly connected with a cylinder barrel, the pressure bin is hermetically connected with a motion bin, a piston rod is arranged in the motion bin in a sliding manner, a piston is fixedly arranged on the upper surface of the piston rod, a valve rod is fixedly connected at the other end of the piston rod, a dust ring is fixedly arranged at the joint of the piston rod, a connecting flange is fixedly connected at the lower surface of the cylinder barrel, the connecting flange is connected with a connecting pipe through a fixing bolt, a guide sleeve is fixedly arranged in the connecting pipe, the valve rod penetrates through the guide sleeve, and a valve seat for separating the interior of the valve body is fixedly arranged in the connecting pipe, and a valve hole is formed in the valve seat corresponding to the valve rod. A valve seat core matched with the valve rod is fixedly arranged at the valve hole of the valve rod;

the position that advances the jar and correspond the fixed block is equipped with the spout, the fixed length that is equipped with in spout one side rather than assorted stopper, even being equipped with the spacing groove on the stopper, the fixed spacing axle that is equipped with in one side that the fixed block is located the spout, spacing axle is connected with rotatory card strip through the pivot, the thickness and the spacing groove phase-match of rotatory card strip.

Preferably, a gap is formed between the clamping piece and the moving block through a clamping bolt, the clamping ring has toughness, friction grains are arranged on the inner side surface of the clamping ring, the sealing groove is matched with a pipeline connected with the connecting pipe, and a sealing gasket is arranged inside the sealing groove.

Preferably, the pneumatic plug is hermetically connected with the inner side of the pressure chamber, and the piston is hermetically connected with the inner side of the motion chamber.

Preferably, the dustproof ring is connected with the inner side wall of the motion cabin in a sliding mode, and a water retaining ring is arranged in the guide sleeve.

Preferably, the lower surface of the valve body is fixedly provided with a stabilizing seat, the stabilizing seat is positioned in the valve body and provided with a stabilizing groove corresponding to the position of the piston rod, and the piston rod is fixedly provided with a stabilizing column corresponding to the position of the stabilizing groove.

In order to realize the purpose, the invention also discloses the following technical scheme: a use method of a pressure-adjustable self-operated pressure regulating valve comprises the following steps:

1) installation: the pipeline is in butt joint with the sealing groove, the gap between the moving block and the pressing piece is reduced by rotating the clamping bolt, the clamping ring is fastened on the pipeline, the pushing bolt rotates on the tightening column to drive the moving block to move towards the direction of the connecting pipe, and the pipeline is inserted into the sealing groove to be fixed.

2) Adjusting pressure: the fixed block is pushed by the pushing handle, the rotary clamping strip on the fixed block is moved, the upper surface of the rotary clamping strip corresponds to the upper surface of the limiting groove, and the rotary clamping strip moves to different limiting groove pressure bins to be in different pressure levels.

3) Fixing: and the positions of the pushing handles are kept unchanged at the positions, corresponding to the upper surfaces of the limiting grooves, of the upper surfaces of the rotary clamping strips, the four rotary clamping strips are rotated, the upper surfaces of the rotary clamping strips are attached to the upper surfaces of the limiting grooves, and the inner arc surfaces of the rotary clamping strips are attached to the outer side surfaces of the pushing cylinders.

Preferably, the upper surface of rotatory card strip is equipped with the friction line to the upper surface that corresponds the spacing groove, spacing axle is steel structure, and spacing axle department scribbles and has smeared lubricating oil.

The invention has the beneficial effects that: valve body simple to operate, pressure regulating valve's pressure can be adjusted, and strong adaptability can act on different operational environment, and the practicality is strong:

(1) the pipeline clamping device is provided with the connecting pipe, the pipeline is butted on the sealing groove, the clamping bolt is rotated to reduce the gap between the movable block and the pressing piece, the clamping ring is fastened on the pipeline, the pushing bolt rotates on the tightening column through the pushing thread to drive the movable block to move towards the direction of the connecting pipe, the movable block drives the pressing piece and the clamping ring to move, the pipeline is inserted into the sealing groove to be fixed, and the pipeline clamping device can be installed by only rotating the pushing bolt and the clamping bolt.

(2) The invention is provided with a pressure bin, a fixed block is pushed by a pushing handle, a rotary clamping strip on the fixed block moves in a sliding groove through a limiting shaft, the upper surface of the rotary clamping strip corresponds to the upper surface of a limiting groove, and in the process of downward movement of the fixed block, a pressure plug presses the pressure bin down, so that the rotary clamping strip moves into the pressure bins of different limiting grooves and has different pressure levels.

(3) The four rotary clamping strips are rotated, the upper surfaces of the four rotary clamping strips are attached to the upper surface of the limiting groove, the inner side cambered surface of the rotary clamping strips is attached to the outer side surface of the pushing cylinder, and after the positions of the rotary clamping strips are fixed, the air pressure plug is fixed, so that the pressure in the pressure bin is kept stable, and the pressure in the piston and the pressure in the valve rod are kept stable.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is an overall schematic view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is an enlarged view of the invention at A;

FIG. 4 is a schematic view of the present invention at a chute;

figure 5 is a schematic view of the moving block of the present invention;

labeled as: 1 valve body, 2 connecting pipes, 3 fixing rings, 4 stabilizing seats, 5 connecting pipes, 6 tightening columns, 7 moving blocks, 8 clamping rings, 9 pushing bolts, 10 clamping bolts, 11 connecting flanges, 12 fixing bolts, 13 cylinder barrels, 14 pneumatic cylinders, 15 pushing cylinders, 16 pushing columns, 17 pushing handles, 18 sliding grooves, 19 limiting blocks, 20 limiting grooves, 21 rotating clamping strips, 22 fixing blocks, 23 pneumatic columns, 24 pneumatic plugs, 25 pressure chambers, 26 piston rods, 27 pistons, 28 moving chambers, 29 dust rings, 30 valve rods, 31 guide sleeves, 32 valve seat cores, 33 valve seats, 34 stabilizing grooves, 35 stabilizing columns, 36 sealing grooves, 37 pushing threads, 38 pressing sheets, 39 limiting shafts and 40 valve holes.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided" and "connected" are to be interpreted broadly, e.g. as a fixed connection, a detachable connection or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The structural features of the present invention will now be described in detail with reference to the accompanying drawings.

Referring to fig. 1-5, a pressure adjustable self-operated pressure regulating valve comprises a valve body 1, a connecting pipe 2, a cylinder barrel 13, a pneumatic cylinder 14 and a pushing cylinder 15, wherein the two sides of the valve body 1 are fixedly connected with the symmetrical connecting pipe 2, a sealing groove 36 is arranged on the outer side of the connecting pipe 2, an external pipeline is connected through the sealing groove 36, a fixing ring 3 is fixedly arranged on the surface of the connecting pipe 2, a tightening column 6 is fixed through the fixing ring 3, the tightening column 6 is uniformly and fixedly provided with a tightening column 6, a pushing thread 37 is arranged on the surface of the tightening column 6, a moving block 7 and a pushing bolt 9 are carried through the tightening column 6, a moving block 7 is slidably arranged on the tightening column 6, the moving block 7 slides on the tightening column 6 to drive a clamping ring 8 to move, and the other side of the moving block 7 is slidably connected with the pushing bolt 9 which is connected on the tightening column 6 through a thread, the pushing bolt 9 rotates on the pushing thread 37 to realize the sliding of the moving block 7, clamping pieces 38 are connected to two sides of the moving block 7 through the clamping bolt 10, a clamping ring 8 is fixedly connected to the clamping pieces 38, and the pipeline is clamped through the clamping ring 8.

Referring to fig. 2, a pushing column 16 is arranged in the pushing cylinder 15, one end of the pushing column 16, which is located outside the pushing cylinder 15, is fixedly provided with a pushing handle 17, the pushing column 16 is pushed by the pushing handle 17, the other end of the pushing column 16 is fixedly connected with a fixing block 22, the fixing block 22 is connected with a limiting shaft 39 and a pneumatic cylinder 23, the lower surface of the fixing block 22 is fixedly connected with the pneumatic cylinder 23, the other end of the pneumatic cylinder 23 is fixedly connected with a pneumatic plug 24, the pressure in the pressure chamber 25 is adjusted by the pneumatic plug 24, the pneumatic plug 24 is located in the pressure chamber 25 of the pneumatic cylinder 14, the pneumatic cylinder 14 is fixedly connected with the cylinder barrel 13, the pressure chamber 25 is hermetically connected with a motion chamber 28, a motion space for the piston 27 is provided by the motion chamber 28, a piston rod 26 is slidably arranged in the motion chamber 28, a piston 27 is fixedly arranged on the upper surface of the piston rod 26, and the other end of the piston rod 27 is fixedly connected with a valve rod 30, the valve is characterized in that the valve rod 30 is connected with a stabilizing column 35, a dust ring 29 is fixedly arranged at the joint of the valve rod 30 of the piston rod 27, the dust ring 29 prevents impurities from entering the cylinder barrel 13, a connecting flange 11 is fixedly connected to the lower surface of the cylinder barrel 13, the connecting flange 11 is connected with a connecting pipe 5 through a fixing bolt 12, the cylinder barrel 13 is fixed through the connecting pipe 5, a guide sleeve 31 is fixedly arranged in the connecting pipe 5, the valve rod 30 penetrates through the guide sleeve 31 and limits the valve rod 30 through the guide sleeve 31, a valve seat 33 for separating the interior of the valve body 1 is fixedly arranged on the valve body 1, the valve body 1 is separated into two air chambers through the valve seat 33, a valve hole 40 is arranged at the position of the valve seat 33 corresponding to the valve rod 30, the valve hole 40 is matched with the valve seat core 32 to form a valve, and the valve rod 30 is fixedly provided with the valve seat core 32 matched with the valve hole 40.

Referring to fig. 4, the position that advances jar 15 and corresponds fixed block 22 is equipped with spout 18, provides spacing axle 39's motion space through spout 18, the fixed stopper 19 that is equipped with length and its assorted in spout 18 one side, the even spacing groove 20 that is equipped with on the stopper 19, it is fixed to rotation card strip 21 through spacing groove 20, fixed block 22 is located one side of spout 18 and is fixed and is equipped with spacing axle 39, makes rotatory card strip 21 can the transverse rotation through spacing axle 39, spacing axle 39 is connected with rotatory card strip 21 through the pivot, fixes the position of fixed block 22 through rotatory card strip 21, the thickness and the spacing groove 20 phase-match of rotatory card strip 21 make rotatory card strip 21 can block into spacing groove 20.

Referring to fig. 5, a gap is formed between the clamping piece 38 and the moving block 7 through the clamping bolt 10, so that the clamping rings 8 are in a separated state, the clamping rings 8 have toughness, friction lines are arranged on the inner side surfaces, after the clamping bolt 10 is tightened, the clamping rings 8 have large friction force with the outer sides of pipes, the sealing groove 36 is matched with the pipe connected with the connecting pipe 2, and a sealing gasket is arranged inside the sealing groove to enable the pipe to be inserted into the sealing groove 36 to keep a sealing state.

Referring to fig. 2, the air pressure plug 24 is hermetically connected with the inner side of the pressure chamber 25, and the piston 27 is hermetically connected with the inner side of the motion chamber 28, so that the pressure chamber 25 is kept in a sealed state.

Referring to fig. 2, the dust ring 29 is slidably connected to the inner sidewall of the motion cabin 28 to protect and block the motion cabin, and a water retaining ring is provided in the guide sleeve 31 to prevent liquid from entering the cylinder 13.

Referring to fig. 2, a stabilizing seat 4 is fixedly arranged on the lower surface of the valve body 1, a stabilizing groove 34 is carried by the stabilizing seat 4, a stabilizing groove 34 is arranged at a position, corresponding to the piston rod 26, of the stabilizing seat 4 in the valve body 1, a stabilizing column 35 is arranged in the stabilizing groove 34, a stabilizing column 35 is fixedly arranged at a position, corresponding to the stabilizing groove 34, of the piston rod 26, and the valve rod 30 is kept stable under the matching of the stabilizing column 35 and the limiting sleeve 20 in the stabilizing groove 34.

Referring to fig. 4, the upper surface of the rotary clamping strip 21 is provided with friction lines corresponding to the upper surface of the limiting groove 20, so that when the rotary clamping strip 21 is in the limiting groove 20, the rotary clamping strip is prevented from moving in the limiting groove 20 by upward pressure from the fixing block 22, the limiting shaft 39 is of a steel structure, the limiting shaft 39 is prevented from collapsing under the action of pressure, and lubricating oil is coated on the limiting shaft 39, so that the rotary clamping strip 21 can rotate freely.

According to the pressure-adjustable self-operated pressure regulating valve and the use method thereof, the valve body is convenient to mount, the pressure of the pressure regulating valve can be adjusted, the adaptability is strong, the pressure regulating valve can act on different working environments, the practicability is strong, and the pressure regulating valve is suitable for popularization.

Specifically, when the pipeline installation device is used, referring to fig. 1, 3 and 5, the valve body 1 is placed at a designated position through the stabilizing seat 4, the pipeline is abutted to the sealing groove 36, the clamping bolt 10 is rotated to reduce the gap between the moving block 7 and the pressing piece 38, the clamping ring 8 is fastened on the pipeline, the pushing bolt 9 is rotated on the tightening column 6 through the pushing thread 37 to drive the moving block 7 to move towards the connecting pipe 2, the moving block 7 drives the pressing piece 38 and the clamping ring 8 to move, the pipeline is inserted into the sealing groove 36 to be fixed, and in the pipeline installation process, the pipeline installation device can be realized only by rotating the pushing bolt 9 and the clamping bolt 10;

referring to fig. 2, after the pipeline is fixed on the connecting pipe 2, the pushing handle 17 is used to push the fixing block 22, so that the rotary clamping strip 21 on the fixing block 22 moves in the sliding groove 18 through the limiting shaft 39, the upper surface of the rotary clamping strip 21 corresponds to the upper surface of the limiting groove 20, and in the process that the fixing block 22 moves downwards, the air pressure plug 24 presses the pressure chamber 25 downwards, so that the rotary clamping strip 21 moves to different limiting grooves 20 and pressure chambers 25 with different pressure levels;

referring to fig. 4, after the pressure in the pressure chamber 25 is determined, the position of the pushing handle 17 is kept unchanged at the position where the upper surface of the rotating clamping strip 21 corresponds to the upper surface of the limiting groove 20, the four rotating clamping strips 21 are rotated, the upper surfaces of the rotating clamping strips 21 are attached to the upper surface of the limiting groove 20, the inner arc surfaces of the rotating clamping strips are attached to the outer side surface of the pushing cylinder 15, the upper surfaces of the rotating clamping strips 21 are provided with friction lines corresponding to the upper surface of the limiting groove 20, so that the rotating clamping strips 21 are prevented from moving in the limiting groove 20 by the upward pressure brought by the fixing block 22 when in the limiting groove 20, the limiting shaft 39 is coated with lubricating oil, the rotating clamping strips 21 can freely rotate, after the position of the rotating clamping strips 21 is fixed, the air pressure plug 24 is fixed, the pressure in the pressure chamber 25 is kept stable, the pressure in the piston 27 and the valve rod 30 is kept stable, the pressure brought by the valve seat core 32 is kept constant, when the pressure on the valve seat core 32 needs to be changed, lubricating oil is coated on the position of the limiting shaft 39, so that the rotary clamping strip 21 can rotate freely, the rotary clamping strip 21 is pulled out of the limiting groove 20 and can be released, the fixing block 22 can move freely in the pushing cylinder 15, and the pressure in the pressure bin 25 is adjusted.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.