阅读说明：本技术 冷热水混合阀 (Cold and hot water mixing valve ) 是由 川岛拓麻 根岸功 丸山善太 畠山七海 于 2019-07-18 设计创作，主要内容包括：本发明提供不降低热水调温性能,而可抑制噪音的冷热水混合阀。本发明涉及冷热水混合阀,其至少具有：具有热水流入口A、冷水流入口B、混合冷热水的混合室C和排出混合水的混合水口D的筒状的壳体1,收纳在所述壳体内的作动器4,和调节所述热水流入口和冷水流入口的开度的控制阀体2；控制阀体通过所述作动器的伸缩而在壳体的轴线方向进退,按照冷热水混合的温度为设定温度来调节热水和冷水的比例；其中,具备在所述壳体1与控制阀体2间、并且在所述热水流入口A与冷水流入口B之间所配置的一个O型圈10,所述O型圈10由六氟丙烯-偏氟乙烯共聚物(FKM)或丁基橡胶形成。(The present invention relates to a hot and cold water mixing valve capable of suppressing noise without deteriorating hot water temperature regulation performance, and at least comprises a cylindrical housing 1 having a hot water inlet A, a cold water inlet B, a mixing chamber C for mixing hot and cold water, and a mixing water port D for discharging mixed water, an actuator 4 housed in the housing, and a control valve body 2 for adjusting the opening degrees of the hot water inlet and the cold water inlet, wherein the control valve body is advanced and retreated in the axial direction of the housing by the expansion and contraction of the actuator, and the ratio of the hot water and the cold water is adjusted so that the temperature of the hot and cold water mixture is a set temperature, wherein O-rings 10 are provided between the housing 1 and the control valve body 2 and between the hot water inlet A and the cold water inlet B, and the O-rings 10 are formed of hexafluoropropylene-vinylidene fluoride copolymer (FKM) or butyl rubber.)

1. A hot and cold water mixing valve having at least:

a cylindrical housing having a hot water inlet, a cold water inlet, a mixing chamber for mixing cold water and hot water, and a mixing nozzle for discharging mixed water,

an actuator housed in the case, and

a control valve body for adjusting the opening degree of the hot water inlet and the cold water inlet;

the control valve body advances and retreats in the axial direction of the shell through the extension and contraction of the actuator, and is adjusted according to the temperature of the cold-hot water mixed water as the set temperature;

the cold and hot water mixing valve is characterized by comprising O-rings arranged between the shell and the control valve body and between the hot water inlet and the cold water inlet,

the O-ring is made of hexafluoropropylene-vinylidene fluoride copolymer (FKM) or butyl rubber.

2. A mixer valve in accordance with claim 1, wherein the compression ratio of the O-ring is 8.3% or less.

3. A mixer valve according to claim 1 or claim 2, wherein the O-ring is disposed in a region from a midpoint between the hot water inlet port and the cold water inlet port to the hot water inlet port.

Technical Field

The present invention relates to a mixer valve ( water mixing plug), and more particularly to a mixer valve that suppresses the generation of noise (abnormal noise).

Background

, since then, cold and hot water mixing valves have been widely used in sanitary equipment for showers, bathtubs, and washstands (サニタリー -mounted products) as means for mixing hot water and cold water to produce mixed water at a predetermined temperature set by a user as .

In general, a hot and cold water mixing valve includes: the water heater comprises a shell with a mixing chamber for mixing hot water and cold water, an inlet of the hot water and an inlet of the cold water which are arranged on the shell, and a control valve body which is accommodated in the shell and is used for adjusting the opening degree of the inlet of the hot water and the opening degree of the inlet of the cold water.

Further, a temperature sensing spring (actuator) made of a shape memory alloy is provided inside the mixing chamber, and biases the control valve body in a direction to reduce the opening degree of the inlet for hot water and to expand the opening degree of the inlet for cold water (safety check).

Further, a biasing spring (biasing body (pressure-sensitive force-receiving body)) is housed inside the housing, and is biased in a direction opposite to the temperature-sensitive spring with respect to the control valve body.

When the temperature of the mixed water of hot water and cold water flowing in from the hot water inlet and the cold water inlet is higher than the set temperature, the temperature sensing spring (actuator) made of the shape memory alloy deforms in shape and the elastic force increases, whereby the control valve body moves in the direction of the hot water inlet to reduce the opening of the hot water inlet, and enlarges the opening of the cold water inlet.

This reduces the inflow of hot water, while increases the inflow of cold water, lowering the temperature of the mixed water, and finally, when the temperature of the mixed water is the set temperature, the control valve body is balanced and stopped at that position.

When the temperature of the mixed water of hot water and cold water is lower than the set temperature, is further improved, and the opening of the inlet of hot water is enlarged by moving the control valve body in the direction of the inlet of cold water by deforming the shape of the temperature sensing spring made of the shape memory alloy and reducing the elastic force, and is further improved by reducing the opening of the inlet of cold water.

Therefore, the inflow amount of hot water is increased, and the inflow amount of cold water is decreased to raise the temperature of the mixed water, and finally, when the temperature of the mixed water is the set temperature, the control valve body is balanced and stopped at the position.

However, it is known that, in the hot and cold water mixing valve, when the opening degree of the inlet of the hot water is very small under high pressure conditions, the flow rate of the inlet of the hot water becomes very high, and thus the control valve for controlling the flow rate vibrates, which causes noise.

In order to solve this problem, various proposals have been made.

For example, japanese patent application laid-open No. 2016- (japanese patent laid-open) No. 125663 discloses a thermostatic valve body (サーモスタットカートリッジ) that prevents pressure fluctuation (サージ) from occurring in a cold water supply passage.

Specifically disclosed is a thermostatic cartridge wherein a regulator body for regulating the mixing ratio of hot water and cold water forms a water annular gap (ギャップ) containing a damping region together with a cartridge housing (カートリッジハウジング) , the water annular gap communicating with a water regulating gap.

In addition, Japanese Utility model laid-open publication No. 6-010681 and Japanese Utility model registration No. 2558665 are designed to be suppressed to 3kg/cm²When the hot water is supplied at a high pressure, the valve body vibrates due to the force generated by the flow of the hot water and collides with the inner periphery of the valve body holding part or the return spring at the periphery thereof to generate a pop or rattle noise, and a valve body support structure of a constant temperature type mixing valve is disclosed, in which (1) the hardness of a plurality of O-rings provided in the valve body holding part holding the outer periphery of the valve body is 85 to 95, (2) the diameters of both ends of the outer periphery of the valve body are made smaller than the diameter of the central part to ensure a gap with the inner periphery of the valve body holding part, and (3) the diameter of a part surrounded by the return spring of the valve body cylindrical part is made smaller than the end cap insertion part (エン) of the front end (tip) of the cylindrical partドキャップ inserting portion) has a small diameter, and (4) a seat for preventing the radial movement of the spring (スプリング) is provided in the valve body and the end cap that support the end of the return spring that biases the valve body in the axial direction.

Further, japanese patent application laid-open No. 10-292872 discloses that when the compression margin of an O-ring for sealing between a movable valve element and a housing is reduced (generation つぶし) and a sealing member is changed to reduce a frictional force, the following ability of the movable valve element with respect to expansion and contraction of a temperature sensitive spring (actuator) is improved, and the movable valve element vibrates at a high frequency, thereby generating noise.

However, as described in japanese patent application laid-open No. 2016-125663, there is a problem that a water adjusting gap becomes a resistance and a flow rate is reduced by providing a water annular gap communicating with the water adjusting gap and providing a damping region in the water annular gap.

Further, as described in japanese utility model application laid-open No. 6-010681 and japanese utility model registration No. 2558665, there is a problem that the outer peripheral portion of the valve body is held by a plurality of O-rings, and the sliding resistance increases, so that the sliding of the valve body is hindered, and the temperature control performance is lowered.

Further, as described above, japanese patent application laid-open No. 10-292872 discloses that it is not preferable to reduce the compression margin of the O-ring and to change the sealing member so as to reduce the frictional force in order to suppress the generation of noise. However, there is a problem that the temperature adjusting performance is lowered because the movable valve body (control valve body) has low followability to expansion and contraction of the temperature sensitive spring (actuator) by increasing the compression margin of the O-ring and increasing the frictional force.

Disclosure of Invention

The present inventors have conducted extensive studies on a cold and hot water mixing valve in which the generation of the above-described noise is suppressed without reducing the temperature regulation performance, on the premise that a water annular gap having a damping region is not provided as described in japanese patent application laid-open No. 2016-125663, and on the other hand, since the use of a plurality of O-rings to hold the outer peripheral portion of a valve body increases the sliding resistance (due to an increase in the frictional force) as described in japanese utility model registration No. 6-010681 and No. 2558665, it is proposed to use O-rings to hold the outer peripheral portion of the valve body, and further, unlike the description in japanese patent application laid-open No. 10-292872, it has been found that the noise can be suppressed without reducing the temperature regulation performance by supporting the control valve body with the O-rings made of a specific material even when the compression margin of the O-rings is reduced and the frictional force between the control valve body and the O-rings is small, and thus the present invention has been completed.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a hot and cold water mixing valve capable of improving temperature adjustment performance and suppressing noise generation.

The hot and cold water mixing valve according to the present invention for solving the above problems includes at least a cylindrical housing having a hot water inlet, a cold water inlet, a mixing chamber for mixing hot and cold water, and a mixing gate for discharging mixed water, an actuator housed in the housing, and a control valve body for adjusting the opening degrees of the hot water inlet and the cold water inlet, wherein the control valve body is advanced and retreated in the axial direction of the housing by expansion and contraction of the actuator, and is adjusted so that the temperature of the mixed water is a set temperature, and the hot and cold water mixing valve is characterized by comprising O-rings disposed between the housing and the control valve body and between the hot water inlet and the cold water inlet, the O-rings being made of hexafluoropropylene-vinylidene fluoride copolymer (FKM) or butyl rubber.

As described above, since O-rings are disposed between the housing and the control valve body and between the hot water inlet and the cold water inlet, the sliding resistance of the valve body is reduced as compared with the case where a plurality of O-rings are disposed, the control valve body has good followability to the expansion and contraction of the actuator, and the temperature control performance can be improved.

Furthermore, since hexafluoropropylene-vinylidene fluoride copolymer (FKM) or butyl rubber is a material having a small rebound resilience, it is excellent in impact absorbability.

Therefore, the O-ring made of hexafluoropropylene-vinylidene fluoride copolymer (FKM) or the O-ring made of butyl rubber can absorb the vibration of the control valve body, so that the generation of noise can be further suppressed .

Further, since the repulsive force (light repulsive force) of hexafluoropropylene-vinylidene fluoride copolymer (FKM) or butyl rubber, which is a material having a small rebound resilience, is small, the repulsive force from the O-ring can be reduced, and the sliding resistance of the control valve body can be further reduced steps.

As described above, the cold and hot water mixing valve according to the present invention has a small sliding resistance of the valve body, and has good followability of the control valve body with respect to expansion and contraction of the actuator, so that the temperature control performance can be improved, and generation of noise can be suppressed.

Here, the compression ratio of the O-ring is preferably 8.3% or less.

When the compression ratio of the O-ring is increased, the repulsive force from the O-ring becomes large, which is not preferable because the sliding resistance of the control valve body becomes large.

In the case of , the compressibility is reduced to further reduce the impact absorption of the O-ring , so that the vibration of the control valve body can be further absorbed at and the generation of noise can be further suppressed at .

Note that, the compression ratio of 0% is not preferable from the viewpoint of sealing property because the O-ring is not deformed. In consideration of the sealing property, the compressibility is most preferably about 3% to 8.3%.

Further, it is desirable that the O-ring is disposed in a region from a midpoint between the hot water inlet and the cold water inlet to the hot water inlet, and the O-ring is disposed at a position closer to a distal end portion (hot water valve) of the control valve body.

The front end portion (hot water valve) of the control valve body is the most vibrating portion, and by supporting the portion with the O-ring, the generation of noise can be further suppressed .

As described above, according to the present invention, it is possible to obtain a hot and cold water mixing valve capable of improving temperature regulation performance and suppressing noise generation.

Drawings

Fig. 1 is a longitudinal sectional view showing an embodiment according to the present invention.

Fig. 2 is a plan view of the control valve body.

FIG. 3 is a side view of the control valve body shown in FIG. 2.

FIG. 4 is an I-I cross-sectional view of the control valve body shown in FIG. 2.

FIG. 5 is a sectional view II-II of the control valve body shown in FIG. 2.

Fig. 6 is an enlarged view of a main portion of fig. 1.

Fig. 7 is a diagram for explaining the compression ratio of the O-ring.

Fig. 8 is a diagram showing the arrangement position of the O-ring in comparative example 1.

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to fig. 1 to 7. First, a general structure of the hot and cold water mixing valve will be described with reference to fig. 1.

As shown in fig. 1, the hot and cold water mixing valve 1 is incorporated (inserted) into a cylindrical case (not shown) as an outer basket, and is formed in a valve body shape as shown in fig. 1.

O-rings 11, 12, and 13 provided on the outer peripheral surface of the hot and cold water mixing valve 1 are provided to ensure airtightness between the hot and cold water mixing valve 1 and the housing when the valve is mounted in the housing.

The housing is provided with, for example, a discharge pipe, a shower hose, and the like, and is configured to discharge the hot/cold water mixture at a set temperature generated by the hot/cold water mixing valve 1.

The hot and cold water mixing valve 1 is assembled by housing a control valve mechanism including a control valve body 2 in a cylindrical housing 1.

The housing 1 includes a 1 st body 1a and a 2 nd body 1b which are cylindrical, and the 1 st body 1a and the 2 nd body 1b (screwed portion 1c) which are cylindrical are screwed to each other at the end side of the 1 st body 1a, and are formed in a cylindrical shape as a whole.

A hot water inlet a through which hot water flows and a cold water inlet B through which cold water flows are formed in parallel in the axial direction in the cylindrical wall of the housing 1, and a mixing chamber C communicating with the hot water inlet a and the cold water inlet B is formed from the inside of the hot water inlet a of the housing 1 toward the end (right side in fig. 1) of the housing 1 on the side.

At an end of the mixing chamber C, a mixed water outlet D for discharging a mixed water of cold and hot water is formed. The hot water flowing in from the hot water inlet a and the cold water flowing in from the cold water inlet B flow into the mixing chamber C, respectively, the cold water and the hot water are mixed in the mixing chamber C, and are discharged from the mixed water outlet D.

In addition, the 1 st body 1a has a hot water valve seat 1d at a position inside the hot water inlet a and a cold water valve seat 1e at a position inside the cold water inlet B.

A control valve body 2 movable in the axial direction of the housing 1 is installed between a hot water valve seat 1d and a cold water valve seat 1e formed in the housing 1. the control valve body 2 is formed in a cylindrical shape, and a hot water valve 2a is formed at an side end (left side end in FIG. 1) of the cylindrical wall, and a cold water valve 2b is formed at another side end (left side end in FIG. 1).

The control valve body 2 is supported by O-rings 10 made of a specific material provided between the hot water inlet A and the cold water inlet B, and the supporting structure of the O-rings 10 and the O-rings 10 will be described in detail below.

Further, a biasing body 3 biasing the control valve body 2 on the cold water valve seat 1e side and an actuator 4 biasing the control valve body 2 on the hot water valve seat 1d side are incorporated in the housing 1.

The biasing member 3 is formed of a material having a constant spring constant. The biasing member 3 is, for example, a coil spring made of stainless steel, but the specific configuration is not particularly limited.

The actuator 4 is configured to expand and contract in response to a temperature change. Examples of the actuator 4 include a shape memory alloy (sma) spring formed of a material whose spring constant changes depending on temperature, and a wax element, but the specific configuration is not particularly limited.

As shown in fig. 1, the actuator 4 is supported between a spring bracket 7 formed inside the 2 nd body 1b (inside the mixing chamber D) and the outside of the bottom 2D of the control valve body 2.

The control valve body 2 adjusts the distance between the hot water valve 2a and the hot water valve seat 1d and the distance between the cold water valve 2b and the cold water valve seat 1e by the balance of the loads applied from the biasing body 3 and the actuator 4. With this configuration, the hot and cold water mixing valve 1 adjusts the mixing ratio of the hot water flowing from the hot water inlet a and the cold water flowing from the cold water inlet B.

Further, a temperature control device (an adjustment bolt 5a, an adjustment bolt shaft 6) that receives a rotational operation from a temperature control dial (a knob 5) and adjusts the axial position of the control valve body 2 by changing the axial load applied to the biasing member 3 in accordance with the rotational operation is incorporated in the housing 1. That is, by rotating the knob 5 to which the temperature dial is attached, the adjusting bolt 5a is rotated, the adjusting bolt shaft 6 is slid in the axial direction, and the control valve body 2 is moved by the biasing body 3.

Thus, the user can set or change the position of the control valve body 2 by operating the temperature adjustment dial according to the discharge of the mixed water at a desired temperature.

In fig. 1, reference numeral 8 denotes a return spring of the adjusting bolt shaft 6, and ends are locked to the fixing member 9, and ends are locked to the adjusting bolt shaft 6, and the adjusting bolt shaft 6 is movable in the axial direction without being shaken ("" たつき) by the return spring 8.

Next, the control valve body 2, the O-ring 10, and the support structure of the O-ring 10 will be described with reference to fig. 2 to 7.

As shown in fig. 2 to 5, the control valve body 2 is provided with: the valve element 2A is formed in a cylindrical shape, a biasing member housing part 2B formed in a bottomed cylindrical shape is provided inside the valve element 2A, a rib part (リブ)2C extending in the axial direction to connect the valve element 2A and the biasing member housing part 2B, and a shaft part 2E extending in the axial direction from the bottom part 2D of the biasing member housing part 2B to the outside.

As shown in fig. 1, the shaft portion 2E is slidably inserted into a shaft guide hole 1f formed in the 1 st body portion 1a, and configured to guide the movement of the control valve body 2.

The control valve body 2 is formed by molding a heat-resistant PPS (polyphenylene sulfide) resin or PSF (polysulfone) resin, for example.

As described above, the hot water valve 2A is formed at the -side end (the upper end in fig. 4) of the cylinder wall of the valve body 2A, and the cold water valve 2b is formed at the -side end (the lower end in fig. 4).

As shown in fig. 1 and 6, the outer peripheral surface of the valve body 2A is supported by O-rings 10, and the valve body 2A is configured to be slidable in the axial direction while forming a hermetic seal between the hot water valve 2A and the cold water valve 2 b.

The biasing body 3 is housed in the biasing body housing part 2B, and the -side end of the biasing body 3 is locked to the inner surface of the bottom part 2D of the biasing body housing part 2B, whereby the control valve body 2 can be slid toward the cold water valve 2B by the repulsive force of the biasing body 3.

The -side end of the actuator 4 is locked to the outer surface of the bottom 2D of the biasing member housing 2B, and the control valve body 2 is thereby slid toward the hot water valve 2a by the repulsive force of the actuator 4.

As shown in fig. 3, 5, and 6, a communication hole 2c is provided in the bottom portion 2D and the cylindrical wall of the bias storage portion 2B on the bottom portion side. The communication hole 2C is configured to guide hot water and cold water (mainly hot water) entering the bias storage portion 2B to the mixing chamber C.

Further, a rib 2C connecting the valve body 2A and the biasing member housing portion 2B is provided at 6 in the circumferential direction and extended in the axial direction.

Thereby, the flow passage 2d is formed between the inner peripheral surface of the valve body 2A and the outer peripheral surface of the bias receiver 2B while connecting the valve body 2A and the bias receiver 2B. The flow path 2d is a structure for guiding hot water and cold water (mainly hot water) to the mixing chamber C.

Next, the O-ring 10 will be explained.

When the hot water is supplied at a high pressure, the valve element 2A vibrates due to the force generated by the flow of the hot water, thereby generating noise. In order to suppress this noise, hexafluoropropylene-vinylidene fluoride copolymer (FKM) or butyl rubber is used as a material of the O-ring 10.

The hexafluoropropylene-vinylidene fluoride copolymer (FKM) has the properties of heat resistance, small rebound resilience and excellent impact absorbability. In addition, butyl rubber has properties of heat resistance, small rebound resilience, and excellent impact absorption, as in hexafluoropropylene-vinylidene fluoride copolymer (FKM).

In particular, since hexafluoropropylene-vinylidene fluoride copolymer (FKM) and butyl rubber have low rebound resilience, when the compression ratio of the O-ring is the same, the repulsive force can be reduced, and the sliding resistance of the valve body can be reduced.

Incidentally, the EPDM (ethylene propylene diene rubber) which is a material of the O-ring for supporting the valve element 2A, which is generally used, is not suitable because of its poor impact absorption property and large rebound resilience, and shows that the rebound resilience of the general EPDM (ethylene propylene diene rubber) is about 61%, the hardness thereof is about 70 °, the rebound resilience of the hexafluoropropylene-vinylidene fluoride copolymer (FKM) is about 14%, and the hardness thereof is about 70 °.

Further, silicone rubber is also unsuitable because of its poor impact absorption and large rebound resilience, as with EPDM (ethylene propylene diene rubber).

Further, when the butyl rubber and the hexafluoropropylene-vinylidene fluoride copolymer (FKM) are compared, the hexafluoropropylene-vinylidene fluoride copolymer (FKM) is more preferable from the viewpoint of chlorine resistance, heat resistance and oil resistance.

Further, , the O-ring 10 is disposed between the valve body 2A and the 1 st body 1a with a compression ratio of 8.3% or less.

By using hexafluoropropylene-vinylidene fluoride copolymer (FKM) or butyl rubber having excellent impact absorbability to reduce the compressibility of the O-ring 10, the sliding resistance of the valve body can be reduced while suppressing the generation of noise, the following ability of the control valve body with respect to the expansion and contraction of the actuator 4 is excellent, and the temperature adjusting performance can be improved.

Here, as shown in fig. 7, when the diameter in the case of no load is X and the diameter in the case of load is Y, the compression ratio is X/Y × 100.

In the O-ring 10 having a small rebound resilience, the smaller the compression ratio, the smaller the repulsive force, the smaller the sliding resistance of the valve element 2A, and the better the followability of the control valve element 2 to the expansion and contraction of the actuator 4, whereby the temperature regulation performance can be improved. Further, the compression ratio of 0% is not preferable from the viewpoint of sealing property because the O-ring is not deformed. Therefore, considering the sealing property, the compressibility is most preferably about 3% to 8.3%.

As shown in fig. 1 and 6, the control valve body 2 is supported by O-rings 10, and specifically, O-rings are used to hold the outer peripheral portion of the valve body 2A.

Although it is conceivable to support the control valve element 2 by a plurality of O-rings, since sliding resistance increases and temperature regulation performance may decrease, O-rings are used to hold the outer peripheral portion of the valve element 2A in the present invention.

Further, as shown in fig. 6, the O-ring is disposed in a region E from a middle point P between the center C1 of the hot water inlet a and the center C2 of the cold water inlet B to the hot water inlet a. That is, the O-ring 10 is provided on the inner circumferential surface of the 1 st body 1a so as to support the hot water valve 2A side with respect to the middle of the valve body 2A in the axial direction.

As shown in fig. 6, it is preferable that: when the center point P between the center C1 of the hot water inlet a and the center C2 of the cold water inlet B and the center C1 of the hot water inlet a is an intermediate point Q, the O-ring 10 is preferably provided in the region F between the intermediate point P and the intermediate point Q.

The length of the region F is different depending on the length between the center C1 of the hot water inlet a and the center C2 of the cold water inlet B, but is usually about 3mm to 4 mm.

Since the O-ring 10 supporting the control valve element 2 is made of a specific material as described above, the vibration of the valve element 2 can be further absorbed by its shock absorption (since the rebound resilience is small), and the generation of noise can be further suppressed by its small rebound resilience, and the sliding resistance of the control valve element 2 is reduced, the following ability of the control valve element with respect to the expansion and contraction of the actuator 4 is good, and the temperature control performance can be improved.

Even when the compression ratio of the O-ring 10 supporting the control valve element 2 is set to 8.3% or less, the shock absorbing performance is further improved by steps, and the vibration of the valve element 2 can be further absorbed by steps, and further, since the compression ratio of the O-ring 10 is set to 8.3% or less, the sliding resistance of the valve element 2A is reduced, the following performance of the control valve element with respect to the expansion and contraction of the actuator 4 is good, and the temperature control performance can be improved.

Further, since the O-ring 10 made of the specific material is provided on the hot water valve seat side than the intermediate point of the distance connecting the center of the hot water inlet a and the center of the cold water inlet B and the control valve body 2 is supported by the O-rings 10, it is possible to absorb the vibration of the valve body 2 at the steps and suppress the generation of noise at the steps, and since it is supported by the O-rings 10, the sliding resistance of the valve body 2A is reduced, the following performance of the control valve body with respect to the expansion and contraction of the actuator 4 is good, and the temperature control performance can be improved.