JPH071559Y2 - Air venting mechanism for pressure regulator and unload valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pressure regulating valve and an unloading valve having an air bleeding function, and more specifically, to mechanical (forced) valve elements regardless of whether fluid is flowing or not. It is related to a pressure regulating valve and a unloading valve that can be reliably opened by pulling up.

[Conventional technology]

In the conventional pressure regulating valve for adjusting the discharge pressure of the pump, the valve body is pressed against the valve seat by the urging means, and the preload of the urging means is changed to adjust the pressure regulating value of the pressure regulating valve.

In addition, in the conventional unload valve that reduces the load on the pump during unloading, the piston moves integrally with the valve body,
When the liquid on the outlet side is stopped, the pressure on the outlet side is sealed at a higher pressure and is displaced against the biasing means, so that the valve body separates from the valve seat and connects the inlet side to the bypass side. ing.

On the other hand, at the time of starting the operation of the pump, if the chemical that is the liquid feed causes the valve and the valve seat to stick to each other, or if the air remains on the discharge side of the pump, the suction failure of the pump and the pump troubled by the suction failure may occur. It will cause seizure of each sliding part and it is necessary to remove air.

In the pressure regulating valve and the unloading valve, even if the preload of the urging means is set to zero, the force for positively displacing the valve body and the piston does not occur. May remain in the closed position. Therefore, in the conventional pump device, it is not sufficient to remove the preload of the biasing means of the pressure regulating valve and the unloading valve to eliminate air, and in addition to the pressure regulating valve and the unloading valve, the air releasing valve is used. Are provided (eg, Japanese Utility Model Publication No. 60-41677 and Japanese Utility Model Publication No. 57-6857).

[Problems to be solved by the device]

Providing an air vent valve in addition to the pressure regulating valve and the unload valve of claim 2 is disadvantageous in terms of cost, space, and maintenance.

An object of the present invention is to provide an air bleeding mechanism in a pressure regulating valve and an unloading valve, which has the original functions of the pressure regulating valve and the unloading valve and can achieve a reliable air bleeding function.

[Means for Solving the Problems]

This invention will be described using the reference numerals of the drawings corresponding to the embodiments.

The pressure regulating valve (10) is a valve body (28) which can be seated on a valve seat (18) and controls the flow of liquid to the escape port (16), and this valve body (28) is a valve seat (18). Urging means for urging toward (34)
And a case body (24) for accommodating the biasing means (34) at least partially inside, and the case body (24) is screwed to the outside and is biased by axial displacement with respect to the case body (24). A pressure regulating grip for adjusting the preload of the means (34), that is, a rotating member (36) and a rod-shaped member (46) that is displaced integrally with the valve body (28) and is exposed at the end to the outside of the rotating member (36). And the rotating member (36) which is fastened to the exposed portion of the rod-shaped member (46).
Has a contact body (48) which is brought into contact with and carried by the rotating member (36) when it is axially displaced by a predetermined amount or more with respect to the case body (24).

The unload valve (50) can be seated on the valve seat (65), and the valve body (66) that controls the flow of liquid from the inlet side (54) to the bypass side (64) and the outlet side (62) When the liquid on the outlet side (62) is stopped by the liquid pressure and is stopped, the piston (78) displaces against the biasing means (94) to separate the valve body (66) from the valve seat (65). ), A case body (60) at least partially accommodating the biasing means (94), and the case body (60) is screwed onto the case body (60) and biased by axial displacement with respect to the case body (60). A pressure regulating grip for adjusting the preload of the means (94), that is, a rotating member (86) and a rod-shaped member (displaced in the axial direction integrally with the piston (78) and exposed to the outside of the rotating member (86) at the end ( 96) and the rotating member (86) which is fastened to the exposed portion of the rod-shaped member (96) and is axially displaced with respect to the case body (60) by a predetermined amount or more, the rotating member (86). It made and a contact member (98) entrained in contact with.

[Action]

 First, the operation of the device of claim 1 will be described.

When the pressure regulating valve (10) is caused to perform a pressure regulating action, the rotating member (36) is rotated with respect to the case body (24), and the length of the biasing means (34) is reduced, whereby the biasing means ( Set the preload of 34) to a value greater than zero. When the liquid pressure on the pressure adjusting side is less than the predetermined value, the valve body (28) is pressed against the valve seat (18) by the urging means (34), and the liquid on the pressure adjusting side is released (16).
Not washed away. When the fluid pressure on the pressure regulating side becomes equal to or higher than a predetermined value, the valve body (28) receives the fluid pressure and separates from the valve seat (18) against the biasing means (34), and the fluid on the pressure regulating side escapes. It is flowed to the mouth (16) and the hydraulic pressure on the pressure regulating side drops.

When the pressure regulating valve (10) is made to perform an air bleeding action, the rotating member (36) is rotated with respect to the case body (24) in a direction to release the preload of the urging means (34). The rotating member (36) is
When it moves with respect to the case body (24) in the axial direction by a predetermined amount or more, it comes into contact with the contact body (48). When the rotating member (36) is further rotated with respect to the case body (24) and further moved in the axial direction with respect to the case body (24), the rod-shaped member (46) rotates via the contact body (48). Entrained by the member (36), the valve body (28) is forcibly separated from the valve seat (18), and the pressure regulating valve (1
0) is open.

Next, the operation of the device of claim 2 will be described.

When the unloading valve (50) is set to perform the unloading function, the rotating member (86) is rotated with respect to the case body (60) to reduce the length of the biasing means (94). The preload of the biasing means (94) is set to a value larger than zero. Liquid such as cleaning liquid is discharged from the unload valve (50) outlet side (6
When ejected by 2), the piston (78) is pressed by the biasing means (94), the valve body (66) is also pressed by the valve seat (65), and the liquid on the inlet side (54) is pressurized. Check valves (70)
Press to open and flow to the outlet side (62). When the ejection of the liquid on the outlet side (62) is stopped and the flow of the liquid on the outlet side (62) stops, the check valve (70) closes. At this time, the outlet side (62) is filled with a pressure equal to or higher than the initial pressure (back pressure) because the flow is closed. The enclosed pressure is applied to the piston (78) through the passage (84). The piston (78) receives hydraulic pressure and moves against the biasing means (94), and the valve body (66) is entrained by the piston (78) to separate from the valve seat (65) and to the inlet. The liquid on the side (54) is flowed to the bypass side (64).

If you want the unloading valve (50) to release air,
In the direction to release the preload of the biasing means (94), the rotating member (8
Rotate 6) with respect to the case body (60). Rotating member (8
6) is a predetermined amount or more in the axial direction with respect to the case body (60),
When it moves, it comes into contact with the contact body (98). Rotating member (86)
Is further rotated with respect to the case body (60) and further moved in the axial direction with respect to the case body (60), the rod-shaped member (96) is moved by the rotating member (86) via the contact body (98). The piston (78) is forcibly moved toward the abutment body (98), the valve body (66) is separated from the valve seat (65), and the inlet side (54) and the bypass side (64) are taken along. Connected and air is evacuated via the bypass side (64).

〔Example〕

 The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a vertical sectional view of the pressure regulating valve 10 of claim 1. Regulator valve
The body 12 of 10 has a pressure adjusting port 14 and a relief port 16 which are in communication with each other. The pressure adjusting port 14 is connected to the discharge port of the pump, and the relief port 16 is connected to a liquid storage tank or the like via a return hose. A valve seat 18 and a valve collar 22 having a through hole 20 formed in a peripheral wall are fitted and inserted into an inner hole of the body 12 which is opened on the side opposite to the pressure adjusting port 14, and the spring case 24 is Screw part
At 26, the valve seat 18 and the valve collar 22 are screwed into the aforementioned inner hole of the body 12 to press the valve seat 18 and the valve collar 22 to the inner hole of the body 12 toward the step portion. The valve body 28 has a valve packing 30 fitted around the periphery thereof.
It is arranged so as to slide on the inner hole of the body 12 on the outer periphery of the. The spring seat 32 as the urging means is the spring case 24.
The compression coil spring 34 is slidably disposed in the
Is compressed between the rear portion of the valve seat and the spring seat 32, and
Pushing towards 18. The cap-shaped pressure adjusting grip 36 is screwed into the outer peripheral threaded portion 40 of the spring case 24 at the inner peripheral threaded portion 38 and is displaced relative to the spring case 24 in the axial direction by relative rotation with respect to the spring case 24. Has become. The pipe-shaped push screw 42 is screwed onto the opening end surface of the pressure-regulating grip 36,
It is in contact with the spring seat 32 at one end. Set screw 44 is
The pressure adjusting grip 36 is screwed onto the end portion of the push screw 42 from the outside to prevent the push screw 42 from rotating relative to the pressure adjusting grip 36. The valve rod 46 is screwed and fixed to the back surface of the valve body 28 at one end, penetrates the centers of the spring seat 32 and the push screw 42 relative to them in the axial direction, and is adjusted at the other end. The pressure grip 36 and the set screw 44 are exposed to the outside. E
The retaining ring 48 is fastened to the exposed end of the valve stem 46 and
Set screw 44 or push screw as an integral part of 36
It is possible to contact 42.

The operation of the pressure regulating valve 10 will be described.

When the pressure regulating valve 10 is caused to perform a pressure regulating operation, the pressure regulating grip 36 serving as a rotating member is rotated with respect to the spring case 24 serving as a case body, and the lengths of both ends of the compression coil spring 34 are reduced. Set the preload of spring 34 to a value greater than zero. When the hydraulic pressure on the pressure adjusting side (generally the hydraulic pressure) is less than a predetermined value, the force applied to the front side of the valve body 28 is small, and
28 is pressed against the valve seat 18 by the compression coil spring 34,
The liquid of 14 does not flow to the escape port 16. When the hydraulic pressure of the pressure adjusting port 14 becomes equal to or higher than a predetermined value, the valve body 28 receives the hydraulic pressure and separates from the valve seat 18 against the compression coil spring 34, and the liquid of the pressure adjusting port 14 becomes
It is flowed to the escape port 16 and the hydraulic pressure at the pressure adjusting port 14 decreases.

When the pressure regulating valve 10 is made to perform an air bleeding action, the pressure regulating grip 36 is rotated with respect to the spring case 24 in a direction to release the preload of the compression coil spring 34. The pressure regulating grip 36 has a spring case 24.
On the other hand, when it moves in the axial direction by a predetermined amount or more, it comes into contact with the E-shaped retaining ring 48 as the contact body. When the pressure regulating grip 36 is further rotated with respect to the spring case 24 and moved in the axial direction with respect to the spring case 24, the valve rod 46 as a rod-shaped member is carried by the pressure regulating grip 36 via the E-shaped retaining ring 48. And the valve body 28 is the valve seat
Forcibly separated from 18, the pressure regulating valve 10 is opened and air is evacuated through the escape port 16.

FIG. 2 is a vertical sectional view of the unload valve 50 according to claim 2.
An inlet 54 is formed in the body 52 of the unload valve 50, the adapter 56 is from the side opposite to the inlet 54, and the valve retainer 58 and the case body 60 are from the direction away from the inlet 54 by 90 °. It is screwed on and assembled. Adapter 56 and valve retainer
An outlet 62 and a bypass port 64 are formed at 58,
It communicates with the entrance 54. The inlet 54 is connected to the discharge port of the pump, the outlet 62 is connected to, for example, a gun nozzle, and the bypass port 64 is connected to a liquid storage tank via a return hose. The valve seat 65 is fixed to the inner end surface of the valve retainer 58, and the spherical valve element 66 can be seated on the valve seat 65, and the inlet 54 and the bypass port
Control the connection with 64. The check valve body 68 is slidably disposed in the adapter 56 and can be seated on the tapered valve seat 70 of the body 52 at the tip portion thereof, and controls the connection between the inlet 54 and the outlet 62. The communication passage 72 is formed in the check valve body 68, and the liquid at the inlet 54 reaches the outlet 62 via the communication passage 72 when the tip of the check valve body 68 is separated from the tapered valve seat 70. . Valve holder 74
Holds the valve body 66 so that the valve body 66 does not come off.
The piston 78 is slidably arranged in the case body 60, and is integrally connected to the valve holder 74 via the rod portion 80. The piston chamber 82 is defined on the lower surface side of the piston 78, and communicates with the outlet 62 via the passage 84. Cap-shaped pressure regulating grip 86
Is threadedly engaged with the threaded portion 90 at the upper end of the case body 60 via the threaded portion 88 on the inner peripheral side, and can be axially displaced with respect to the threaded portion 90 by relative rotation with respect to the threaded portion 90. Spring seat 92
Is in contact with the back side of the piston 78 and is slidable in the case body 60 in the axial direction. The compression coil spring 94 abuts the end face of the pressure regulating grip 86 and the spring seat 92 at both ends, and urges the piston 78 toward the valve body 66. The valve seat 96 is screwed and fixed to the piston 78 at the lower end, penetrates through the closed end face of the pressure regulating grip 86 so as to be relatively movable in the axial direction, and is exposed to the outside of the pressure regulating grip 86. The E-shaped retaining ring 98 is fastened to the exposed end portion of the valve rod 96 and can come into contact with the closed end surface portion of the pressure regulating grip 86.

The operation of the unload valve 50 will be described.

When the unloading valve 50 is set to perform the unloading function, the pressure regulating grip 86 is rotated with respect to the case body 60, and the length of the compression coil spring 94 is reduced to reduce the length of the compression coil spring 94. Set the preload to a value greater than zero.
When the gun nozzle or the like connected to the outlet 62 is opened and the liquid such as the cleaning liquid is ejected on the outlet 62 side of the unloading valve 50, the piston 78 is pressed by the compression coil spring 94, and the valve body 66 also. Pressed by the valve seat 65, the liquid at the inlet 54 is pressurized and flows to the outlet 62 through the communication passage 72 of the check valve body 68. When the gun nozzle or the like on the outlet 62 side is closed, the ejection of liquid on the outlet 62 side is stopped, and the flow of liquid at the outlet 62 stops, the tip of the check valve body 68 comes into contact with the tapered valve seat 70 of the body 52. Since the back pressure equal to or higher than the initial pressure is sealed on the outlet side, the piston 78 receives the hydraulic pressure in the piston chamber 82 and moves against the compression coil spring 94.
Entrained by the piston 78 via the valve holder 74 and the valve holder 74, the liquid at the inlet 54 separates from the valve seat 65 and flows to the bypass port 64.

When the unloading valve 50 is to perform the air bleeding action, the pressure regulating grip 86 is rotated with respect to the case body 60 in the direction to release the preload of the compression coil spring 94. Pressure regulating grip 86 is a case body
When it moves in the axial direction by a predetermined amount or more with respect to 60, it comes into contact with the E-shaped retaining ring 98. When the pressure regulating grip 86 is further rotated with respect to the case body 60 and moved in the axial direction with respect to the case body 60,
The rod 96 is axially entrained by the pressure-regulating grip 86 via the E-shaped retaining ring 98, the piston 78 is forcibly moved toward the E-shaped retaining ring 98, and the valve element 66 is connected to the rod portion 80 and the valve. Piston through holder 74
It is displaced together with 78 and is forcibly separated from the valve seat 65. In this way, the air in the pump device is evacuated through the bypass port 64.

[Effect of device]

According to the pressure regulating valve of the first aspect, the rotating member is rotated with respect to the case body, and the preload of the biasing means is released. Further, the rotating member abuts on the body that moves in the axial direction integrally with the valve body through the rod-shaped member, and the rotating member displaces the valve body through the abutment body and the rod-shaped member, and the valve body is valved. Since it is forcibly separated from the seat, the pressure regulating valve can have a reliable air bleeding function regardless of sticking of the valve body.

According to the unloading valve of the second aspect, the rotating member is rotated with respect to the case body, and the preload of the biasing means is released. Further, the rotating member comes into contact with the contact body that moves in the axial direction integrally with the piston through the rod-shaped member, and the rotating member forcibly displaces the piston through the contact body and the rod-shaped member, and the valve body Is surely set to a free state, so that the unload valve can have a reliable air bleeding function regardless of sticking of the piston or the like.

The pressure regulating valve and the unloading valve of the present invention ensure that the valve body is mechanically (forcibly) pulled up by the action of the pressure regulating grip (rotating member) to maintain the open state regardless of whether the fluid is flowing or not. Since it has an air venting function, it is possible to remove the residual liquid inside, and it is possible to easily avoid deformation and rupture due to freezing and expansion that often occur in cold regions, for example, and an air venting device separate from the pressure regulating valve and the unloading valve. Need not be provided,
The pump device as a whole can contribute to space reduction, cost reduction, and simplification of maintenance, and depending on the degree of protrusion of the rod-shaped member from the pressure-regulating grip, the air-releasing state or the pressure-regulating state can be obtained. It is extremely useful for practical use that it is possible to visually determine whether there is any.

[Brief description of drawings]

1 and 2 are vertical sectional views of a pressure regulating valve and an unloading valve according to an embodiment of the present invention, respectively. 10 ... Pressure regulating valve, 16 ... Relief port, 18 ... Valve seat, 24 ... Spring case (case body), 28 ... Valve body, 34 ... Compression coil spring (biasing means), 36 ... Pressure grip (rotating member), 46 ……
Valve rod (rod-shaped member), 48 ...... E-shaped retaining ring (contact body), 50 ...
… Unload valve, 54 …… Inlet, 60 …… Case body, 62 ……
Outlet, 64 ... Bypass port, 65 ... Valve seat, 66 ... Valve body, 78
...... Piston, 86 ...... Pressure adjusting grip (rotating member), 94 ...... Compression coil spring (biasing means), 96 ...... Valve rod (rod member),
98 …… E-shaped retaining ring (contact body).

Claims (2)

[Scope of utility model registration request] 1. An escape port (16) which can be seated on a valve seat (18).
Valve body (28) for controlling the flow of liquid to the
Biasing means (34) for urging 8) toward the valve seat (18).
A case body (24) for accommodating the urging means (34) at least partially inside, and a case body (24) screwed to the outside of the case body (24) and axially displaced with respect to the case body (24). A pressure regulating grip for adjusting the preload of the urging means (34), that is, a rotating member (36) and a rod-like member whose body is displaced integrally with the valve body (28) and whose end is exposed to the outside of the rotating member (36). The member (46) and the rotating member (36), which is fastened to the exposed portion of the rod-shaped member (46) and axially displaced by a predetermined amount or more with respect to the case body (24), of the rotating member (36). ), And an abutment body (48) which is brought into contact with and is carried by the air pressure control valve. 2. The valve seat (65) can be seated and the inlet side (54)
From the valve body (66) that controls the flow of liquid from the outlet side to the bypass side (64) and when the liquid on the outlet side (62) is stopped by sliding under the liquid pressure on the outlet side (62). A case in which the piston (78) that displaces against the biasing means (94) to separate the valve body (66) from the valve seat (65) and the biasing means (94) are at least partially housed inside. A body (60) and a pressure regulating grip or a rotating member (which is screwed to the outside of the case body (60) to adjust the preload of the urging means (94) by axial displacement with respect to the case body (60). 86) and the piston (7
8) Displaces in the axial direction integrally with the rotary member (8
6) The rod-shaped member (96) exposed to the outside of the rod-shaped member (6) and the rotating member (86) which is fastened to the exposed portion of the rod-shaped member (96) is axially displaced with respect to the case body (60) by a predetermined amount or more. In some cases, the air bleeding mechanism in the unload valve, comprising an abutting body (98) that is brought into contact with and carried by the rotating member (86).