JPH01316574A - pressure regulating valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pressure regulating valve for regulating the discharge pressure of a pump, and more particularly to a pressure regulating valve having pressure relief and air venting functions.

[Conventional technology]

3 to 5 relate to a conventional pressure regulating valve 10, and FIG. 3 is a longitudinal sectional view of the pressure regulating valve 10. As shown in FIG. Body 1 of pressure regulating valve 10
A flange 14 is connected to the lower surface of 2 by bolts 16,
The inlet 18 and the outlet 20 are formed in the lower part of the flange 14 and the side of the body 12, respectively, and are in communication with each other. The inlet 18 communicates with the outlet of a pump serving as a pressure regulator, and excess liquid is returned to the tank or the like through the outlet 20. The valve seat 22 is fitted into an annular groove at the junction between the body 12 and the flange 14 between the inlet 18 and the outlet 20, and the O-ring 24 provides a seal around the periphery of the valve seat 22. ,Also.

The O-ring 26 maintains a seal at the contact portion between the flange 14 and the valve seat 22, respectively.

FIG. 4 is a plan view of the valve seat 22, and FIG. 5 is a sectional view taken along the line -V in FIG. The annular groove 28 is formed on the outer periphery of the valve seat 22, and has an annular projection 30 projecting in the axial direction at the upstream end. The pressure relief groove 32 has an annular projection 30
The annular projection 30 is formed at one location in the circumferential direction of the annular projection 30, and the inside and outside of the annular projection 300 are communicated in the radial direction.

Returning to FIG. 3, the valve body 34 is disposed on the downstream side of the valve seat 22 so as to be freely displaceable in the axial direction, and can be seated on the annular projection 30 of the valve seat 22. The spring seat 36 is disposed within the body 12 so as to be freely displaceable in the axial direction so that its center line coincides with that of the valve body 34, and the compression coil spring 38
and the spring seat 36, and the valve body 34 is connected to the valve seat 22.
It is biased towards. The pressure adjusting screw 40 is screwed into the upper end of the body 12 and is freely displaceable with respect to the body 12 in the axial direction. The push screw 42 is.

It is screwed and fixed to the pressure adjustment screw 40, is displaced integrally with the pressure adjustment screw 40 in the axial direction, and presses the spring seat 36 toward the valve body 34 at the lower end. Connect the pressure adjusting screw 40 to the body 12.
By rotating the pressure adjusting screw 40. relative to the body 12. The axial positions of the push screw 42 and the spring seat 36 change, and the initial load of the compression coil spring 38 changes.

As a result, the hydraulic pressure at the inlet 18 when the valve body 34 separates from the valve seat 22, that is, the pressure regulation value changes. 0 ring 44
is fitted into the annular groove of the spring seat 36 to maintain a seal around the periphery of the spring seat 36.

During operation of the pump, when the pump discharge pressure is less than the set value, the valve body 34 is pressed against the valve seat 22 by the compression coil spring 38, and there is almost no flow of liquid from the inlet 18 to the outlet 20 (pressure There is a small amount through the cutout groove 32.)
. When the pump discharge pressure exceeds the set value, the valve body 34 separates from the valve seat 22 against the compression coil spring 38, the liquid in the inlet 18 flows to the outlet 20, and the pump discharge pressure decreases to the set value.

When the discharge side of the pump is connected to a gun nozzle that is opened and closed by an operator, when the pump is stopped, liquid remains on the discharge side of the pump, and the liquid pressure on the discharge side of the pump is maintained at a predetermined value or higher. This becomes a load during the next operation of the pump, and may become a hindrance when starting operation of the pump. In this pressure regulating valve 10, the residual pressure on the discharge side of the pump is released to the outlet 20 via the pressure release groove 32 of the valve seat 22.
Since the pressure decreases, it is possible to prevent the next start of operation of the pump from being hindered by the residual pressure.

If air or the like is present in the pump chamber when the pump starts operating, and the gun nozzle is closed, it will be difficult for the pump to suck in liquid, and the pump may be damaged due to dry operation. In this pressure regulating valve 10.

The inlet 18 and the outlet 20 are connected to the pressure relief groove 32 of the valve seat 22.
Because they communicate with each other through the pressure relief groove 3
2 to avoid dry running of the pump.

[Problem that the invention seeks to solve]

The problems with the conventional pressure regulating valve 10 are listed below.

(1) The liquid flows concentratedly into the pressure relief groove 32.

The pressure relief groove 32 is likely to wear out, and the portions of the inner surface of the body 12 that are hit by the liquid ejected from the pressure relief groove 32 are likely to be worn out.

(2) The pressure relief groove 32 is easily clogged with foreign matter.

(3) Since the flow cross-sectional area of the pressure release groove 32 is fixed, the amount of air release cannot be increased.

(4) When the valve body 34 is opened, the flow of liquid in the area of the valve body 34 becomes uneven due to the pressure relief groove 32, which tends to cause valve noise.

(5) During pressure regulation, the valve body 34 and the valve seat 22 repeatedly collide with each other, resulting in significant wear on both.

An object of the present invention is to solve the above-mentioned problems in a pressure regulating valve.

[Means for solving problems]

The invention will be described using reference numerals in the drawings that correspond to the embodiments.

The pressure regulating valve (46) of claim 1 includes an inlet (50) connected to the pressure regulating section, an outlet (52) through which liquid led from the inlet (50) flows out, and an inlet (50). A valve seat (54) disposed between the valve seat (50) and the outflow port (52), and a valve disposed downstream of the valve seat (54) so as to be freely displaceable in the axial direction of the valve seat (54). a spring (66) that biases the valve body (64) toward the valve seat (54), and a valve seat (54).
The valve body (64
) and a stop flange (68) that sets the displacement limit of the valve body (64) in the upstream direction by contact with the valve body (64).

The pressure regulating valve (76) according to a second aspect of the present invention includes an inlet (80) connected to the pressure regulating part, an outlet (82) from which the liquid led from the inlet (80) flows out, and an inlet ( A valve seat (80) disposed movably between the outlet (82)
84), a spring (94) that urges the valve seat (84) in the upstream direction, and a stopper (94) that sets the displacement limit of the valve S (84) in the upstream direction by contact with the valve seat (84). 86)
And the valve! The valve body (96) is disposed upstream of the valve seat (84) and has a valve body (96) whose position in the axial direction of the valve seat (84) can be adjusted.

[Effect]

In the invention of claim 1, by adjusting the position of the stopper (68) with respect to the direction of the valve seat (54), the valve body (64) is carried downstream by the stopper (68) against the spring (66). , the size of the annular gap between the valve body (64) and the valve seat (54) increases. When this pressure regulating valve (46) is applied to a metering pump, the working pressure can be uniquely determined by the set amount of this annular gap. therefore.

The position of the stopper (68) in the axial direction of the valve seat (54) is changed so that the desired pressure regulation value is obtained.
) and the valve body (64).

When the operation of the pump is temporarily stopped but the amount of liquid passing through the inlet (50) increases and the liquid pressure at the inlet (50) exceeds the limit value (working pressure), the valve closes. body(
64) moves away from the valve seat (54) against the spring (66);
The liquid at the inlet (50) passes through the annular gap at a uniform and distributed flow rate in the circumferential direction of the annular gap, and flows through the annular gap at the outlet (50).
2), and at this time, the hydraulic pressure at the inlet (50) increases above the limit value (working pressure).

When the operation of the pump is stopped, the liquid on the discharge side of the pump, that is, the liquid at the inlet (80) passes through the annular gap at a uniform and distributed flow rate in the circumferential direction of the annular gap,
At this time, the annular gap between the valve body (64) and the valve seat (54) is held by the stopper (68), so that the inlet (50) and the outlet of the pressure regulating valve are (5
2) is reliably maintained in communication.

Therefore, the hydraulic pressure at the inlet (50) decreases to the limit value. Furthermore, when the pump starts operating, the air present in the pump chamber is discharged from the annular gap between the valve body (64) and the valve seat (54) to the outlet (52).

In the invention of claim 2, the valve body (96) is aligned with the valve seat (84) by adjusting the position of the valve body (96) in the axial direction of the valve seat (84).
4), the size of the annular gap between the valve body (96) and the valve seat (84) increases. This pressure regulating valve (7) is attached to the metering pump.
When applying 6), the working pressure can be uniquely determined by the set amount of this annular gap. Therefore, in order to obtain the desired pressure regulation value, the position of the valve body (96) in the axial direction of the valve seat (84) is changed, and the position between the valve seat (84) and the valve body (96) is changed. Adjust the dimensions of the annular gap.

When the operation of the pump is temporarily stopped while the pump continues to operate, when the amount of liquid passing through the inlet (80) increases and the liquid pressure exceeds the limit value (working pressure), the valve P35. (84) It is displaced downstream against the spring (94), and the hydraulic pressure at the inlet (8o) is extracted to the outlet (82) and increases above the limit value (working pressure).

When the operation of the pump is stopped, the liquid on the discharge side of the pump, that is, the liquid at the inlet (8o) passes through the annular gap at a uniform and distributed flow rate in the circumferential direction of the annular gap,
At this time, the annular gap between the valve body (96) and the valve seat (84) is maintained by adjusting the position of the valve body (96), so that the flow of the pressure regulating valve (76) is reduced. Entrance (80)
and the outlet (82) are reliably maintained in communication. Therefore, when the pump starts operating, the air present in the pump chamber is drawn out from the annular gap between the valve body (96) and the valve seat (84) to the outlet (82).

〔Example〕

The present invention will be described below with reference to the embodiments shown in FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional view of the pressure regulating valve 46. The body 48 is
An inlet 5o and an outlet 52 are formed at the side and lower portions, respectively, and the inlet 5o and the outlet 52 communicate with each other via a passage within the body 48. The inlet 5° is connected to the outlet of the pump, and the liquid discharged from the pump is sent to the gun nozzle, and the outlet 52 is connected to a liquid storage tank via a return hose or the like. The valve seat 54 is connected to the body 48
It is inserted into the body 48 from the upper part of the body 48 , and is placed against a step in the body 48 and located between the inlet 50 and the outlet 52 . The valve seat retainer 56 is screwed into the body 48 on the upper side of the valve seat 54 and presses the valve seat 54 toward the outlet 52 on the lower surface. , O-rings 58 and 60 are valve seat holders that are fitted into annular grooves on the outer peripheries of the valve seat 54 and the valve seat holder 56, respectively, and maintain seals on the outer peripheries of the valve seat 54 and the valve seat holder 56. A plurality of through holes 62 are formed in the peripheral wall at the lower end of the valve 56 , allowing the inlet 50 to communicate with the valve seat 54 . A spherical valve body 64 is disposed on the outlet 52 side with respect to the valve seat 54 so as to be freely displaceable in the axial direction of the valve seat 54 , and a compression coil spring 66 moves the valve body 64 from the downstream side of the valve body 64 to the valve seat 54 . It is biased towards. Stopper 68
extends in the axial direction of the valve seat 54, is screwed into the inner hole of the valve seat holder 56 at the intermediate portion, and can freely adjust the position of the valve seat 54 relative to the body 48 in the axial direction. The frame portion 70 is formed at the lower end of the stopper 68, passes through the valve seat 54, and abuts the valve body 64 at its lower end. The diameter of the frame portion 70 is smaller than the diameter of the valve seat 54, and a sufficiently large gap is formed between the inner circumference of the valve seat 54 and the frame portion 70. Nigiri 7
2 is fixed to the end of the stopper 68 protruding outside the body 48 and is rotated by the operator, and rotates integrally with the stopper 68. O-ring 7
4 is fitted into the annular groove of the stopper 68, and the valve seat retainer 56
and the stopper 68.

The function of the pressure regulating valve 46 will be explained.

By adjusting the position of the stopper 68 in the axial direction of the valve seat 54, the valve body 64 is carried downstream by the frame portion 70 of the stopper 68 against the compression coil spring 66, and is moved between the valve body 64 and the valve seat 54. The size of the annular gap increases.

When the pressure regulating flow rate is constant, as the annular gap size increases,
The amount of liquid flowing from the inlet 50 to the outlet 52 increases,
The hydraulic pressure at the inlet 50, ie, the discharge side of the pump, decreases. Now, the pressure adjustment value is the working pressure of the pump when the gun nozzle is opened and liquid is spewed out from the gun nozzle (the so-called maximum ejection pressure).

For example, the position of the stopper 68 in the axial direction of the valve seat 54 is changed so that 20 kg/d) is obtained.
The size of the annular gap between the valve body 64 and the valve body 64 is adjusted.

If the work is stopped while the pump continues to operate.

As the amount of liquid passing through the inlet 50 increases and the liquid pressure exceeds the working pressure (maximum spray pressure), the valve element 64 moves away from the valve seat 54 against the compression coil spring 66, and the liquid in the inlet 50 passes through the annular gap at a uniform and distributed flow rate in the circumferential direction of the annular gap and flows to the outlet 52, and at this time,
The discharge pressure of the pump is the maximum cut-off pressure (for example, 25 kg/all
). Note that the initial load of the compression coil spring 6G is set in advance so that the maximum cut-off pressure is a desired value.

When the operation of the pump is stopped, the liquid on the discharge side of the pump, that is, the liquid at the inlet 50 flows through the annular gap at a uniform and distributed flow rate in the circumferential direction of the annular gap between the valve body 64 and the valve seat 54. and flows to the outlet 52, at this time,
The gap between the valve body 64 and the valve seat 54 is defined by the frame 70 of the stopper 68.
Therefore, the inlet 50 and outlet 52 of the pressure regulating valve 46 are in communication with each other. Therefore, when the pump starts operating, the air present in the pump chamber flows between the valve body 64 and the valve seat 5.
4 through the annular gap to the outlet 52.

FIG. 2 is a longitudinal sectional view of another pressure regulating valve 76. body 78
has an inlet 80 and an outlet 8 at its side and bottom, respectively.
2, the inlet 80 and the outlet 82 are connected to the body 7.
They communicate with each other via passages within 8. The inlet 80 is connected to an outlet 82 of the pump, and the liquid discharged from the pump is sent to the gun nozzle, and the outlet 82 is connected to a liquid storage tank via a return hose or the like. The valve seat 84 is disposed in the middle of a passage that communicates the inlet 80 and the outlet 82, and is freely displaceable in the axial direction. Stopper 86
is screwed into the inner hole of the body 78 on the upper side of the valve seat 84, and abuts on the upper surface of the valve seat 84 at its lower end, so that its relative position with respect to the body 78 in the axial direction can be adjusted. 0 rings 88 and 90 are respectively valve seats 84
and is fitted into an annular groove on the outer periphery of the stopper 86 to maintain a seal on the outer periphery of the valve seat 84 and the stopper 86.

A plurality of through holes 92 are formed in the peripheral wall at the lower end of the stopper 86, allowing the inlet 80 to communicate with the valve seat 84.

A compression coil spring 94 is compressed between the valve seat 84 and a step in the inner hole of the body 78 and biases the valve seat 84 toward the stopper 86 . The valve body 96 is disposed on the upstream side of the valve seat 84, extends in the axial direction of the valve seat 84, is screwed into the inner hole of the stopper 86 at an intermediate portion, and has a position relative to the body 78 in the axial direction of the valve seat 84. It is adjustable.

The valve portion 98 is formed at the lower end of the valve body 96, and the valve Pi84
is facing. The grip 100 is fixed to the end of the valve body 96 protruding outside the body 78 and is rotated by an operator, so that the grip 100 rotates integrally with the valve body 96. The O-ring 102 is fitted into the annular groove of the valve body 96 and maintains a seal between the valve body 96 and the stopper 86.

The function of the pressure regulating valve 76 will be explained.

By adjusting the position of the valve body 96 in the axial direction of the valve seat 84,
Valve body 96 moves away from valve seat 84 and the size of the annular gap between valve body 96 and valve seat 84 increases. When the temperature-pressure flow rate is constant, as the size of the annular gap increases, the amount of liquid flowing from the inlet 80 to the outlet 82 increases, and the liquid pressure in the inlet 80, that is, the pressure regulating section, decreases. Now, the valve seat 84 is adjusted so that the pressure adjustment value, that is, the working pressure of the pump when the gun nozzle is opened and liquid is spouted from the gun nozzle (the so-called maximum spray pressure, for example, 20 cg/a#) is obtained. The position of the valve body 96 in the axial direction of the valve seat 84 and the valve body 9 is changed.
Adjust the size of the annular gap between 6 and 6.

If the operation of the pump is stopped while the pump continues to operate, the amount of liquid passing through the inlet port 80 increases, and when the liquid pressure exceeds the working pressure (maximum spray pressure), the valve seat 84 resists the compression coil spring 94. The liquid in the inlet 80 passes through the annular gap at a uniform and distributed flow rate in the circumferential direction of the annular gap, and flows to the outlet 82.

At this time, the pump discharge pressure is up to the maximum cut-off pressure (for example, 2
5) rise to cg/a#). Note that the initial load of the compression coil spring 94 is set in advance so that the maximum cut-off pressure becomes a desired value pressure.

When the operation of the pump is stopped, the liquid on the discharge side of the pump, that is, the liquid at the inlet 80 passes through the annular gap at a flow rate that is uniform and distributed in the circumferential direction of the annular gap, flows to the outlet 82, and flows to the outlet 82. At this time, since the gap between the valve body 96 and the valve seat 84 is maintained by adjusting the position of the valve body 96, a state of communication between the inlet 80 and the outlet 82 of the pressure regulating valve is ensured. Therefore, when the pump starts operating, the air present in the pump chamber is drawn out from the annular gap between the valve body 96 and the valve seat 84 to the outlet 82.

〔Effect of the invention〕

In the invention of claim 1, the valve body is disposed between the inlet and the outlet so as to be freely displaceable in the axial direction in response to the hydraulic pressure on the upstream side, and the displacement limit of the valve body on the upstream side is set by the stopper. It is adjustable. Therefore, by adjusting the displacement limit of the valve body on the upstream side via the stopper, the dimensions of the annular gap between the valve body and the valve seat are changed, thereby increasing the pressure regulation value (working pressure) by the pressure regulation valve. It is possible to adjust.

In the invention of Claim 2, the valve seat is disposed between the inflow port and the outflow port so as to be freely displaceable in the axial direction in response to hydraulic pressure on the upstream side, and the valve body is disposed on the upstream side of the valve seat. The axial position can be adjusted. Therefore, by adjusting the position of the valve body in the axial direction of the valve seat, it is possible to change the dimension of the annular gap between the valve body and the valve seat, thereby adjusting the pressure regulation value by the pressure regulation valve. be. In both claims 1 and 2, the annular gap is maintained even after the pump stops operating.

The common effects of the inventions of claims 1 and 2 are listed below.

(1) When the pump is stopped, the liquid on the discharge side of the pump can escape through the annular gap between the valve body and the valve seat, which prevents liquid pressure from remaining on the discharge side of the pump. .

Further, at this time, the liquid flows out in the annular gap in a substantially uniform and distributed manner in the circumferential direction, so that wear of various parts due to the jet flow can be prevented.

(2) When the pump is started, the air existing in the pump chamber is discharged from the annular gap between the valve body and valve seat of the pressure regulating valve, which prevents pump suction failure and dry operation. . Furthermore, since the dimensions of the annular gap can be adjusted as desired, the amount of air removed can be significantly increased.

(3) An annular gap is formed instead of a small diameter pressure relief groove to release residual pressure and air.

Clogging caused by foreign matter can be suppressed.

(4) During pressure adjustment, the valve body and valve seat do not collide with each other, so
It is possible to prevent both wear due to collision.

(5) Since the liquid flows out in the annular gap in a substantially uniform and distributed manner in the circumferential direction, it is possible to suppress the noise of the pressure regulating valve.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views of different pressure regulating valves according to embodiments of the present invention, FIGS. 3 to 5 are longitudinal sectional views of conventional pressure regulating valves, and FIG. 3 is a longitudinal sectional view of the pressure regulating valve. 4 is a plan view of the valve seat, and FIG. 5 is a sectional view taken along line V-V in FIG. 4. 46.76...Pressure regulating valve, 50.82...Inflow port, 5
2.82... Outlet, 54.84... Valve seat, 64.
96... Valve body, 66.94... Compression coil spring (spring), 68.86... Stopper. Fig. 1 Fig. 2 Fig. 6 Fig. 4 Fig. 4 Fig. 5 Procedure auxiliary device (0 button July 14, 1988 Commissioner of the Japan Patent Office Yoshi 1) Moon Takeshi 1, Display of the case 1988 Patent application No. 145793 No. 2, Name of the invention Pressure regulating valve 3, Relationship with the case of the person making the amendment Patent applicant name Name Maruyama Seisakusho Co., Ltd. 4, Agent (6, Contents of amendment) In the specification, page 8, line 12 2) Correct "Iru," in line 11 of page 11 as follows. J 3) Delete “pressure” on page 16, line 17, and 4) Amend “82” on page 19, line 17 as follows: “80” Amend “Figure 2” in the attached drawing as shown in the attached sheet do.

Claims (2)

[Claims] (1) An inlet (50) connected to the pressure regulating part and an outlet (50) from which the liquid led from the inlet (50) flows out.
2), a valve seat (54) disposed between the inlet (50) and the outlet (52), and an axis of the valve seat (54) on the downstream side of the valve seat (54). A valve body (64) is disposed so as to be freely displaceable in the direction, and this valve body (64) is attached to the valve seat (54)
) and a spring (66) that biases the valve body (66) toward the valve body (6
4); and a stopper (68) that sets a displacement limit of the valve body (64) in the upstream direction by contact with the valve body (64). (2) An inlet (80) connected to the pressure regulating section and an outlet (80) through which the liquid led from the inlet (80) flows out.
2), a valve seat (84) disposed displaceably between the inlet (80) and the outlet (82), and a spring (84) that biases the valve seat (84) in the upstream direction. 94) and the valve seat (84), the valve seat (84) moves in the upstream direction.
a stopper (86) that sets a displacement limit of the valve seat (84); and a valve body (96) that is disposed upstream of the valve seat (84) and is capable of adjusting the position of the valve seat (84) in the axial direction. A pressure regulating valve comprising: