JP2000330647A - Piston type pressure regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure in which highly precise gas pressure regulation can be realized. SOLUTION: A pressure reducing piston 21 is urged with a regulating spring 22, and a valve sheet 25 for opening and closing a valve hole 63 formed at an regulator main body 10 is mounted on this pressure reducing piston 21. In this case, the pressure reducing piston 21 is formed so as to be divided into a piston part 211 to be urged by a regulating spring and a regulating valve part 212 on which the valve sheet 25 is mounted, and a projecting part 220 is formed at the central regulating valve part side of the piston part, and the regulating valve part 212 is constituted so that this can slide inside a cylindrical guide wall formed at a spring bearing 24 of the regulating spring 22. Thus, even when the piston part 211 is inclined according to the inclination of the regulating spring 22, the valve sheet 25 can be prevented from being inclined to a valve hole 63.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulator for reducing the pressure of a high-pressure gas taken out of a high-pressure container (cylinder) of a liquefied gas to a required gas pressure. The present invention relates to a structure of a piston-type pressure regulator for performing high-precision gas pressure regulation in a first pressure reducing portion of a pressure regulator.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, for example, as shown in FIGS. 6 and 7, a two-stage pressure reducing type pressure regulator is a piston type pressure regulator, and a second pressure reducing portion 202 is a diaphragm type pressure regulator. There is known a structure provided with a pressure gauge 203 for measuring an inlet pressure of the second pressure reducing section 202 as a pressure vessel. FIG. 6 shows a longitudinal section of the two-stage depressurization type pressure regulator, and FIG. 7 shows a cross section of the two-stage decompression type pressure regulator.

[0003] This two-stage depressurizing type pressure regulator comprises an inflow port 101, a first depressurizing section 201, and a substantially cylindrical regulator main body 100.
The second decompression unit 202 and the outlet 102 are engraved toward the center, respectively, and the first decompression unit 201 and the second decompression unit 202 are alternately arranged on the front and rear surfaces of the substantially cylindrical regulator body 100 in the axial direction. Are formed at opposite positions. The inflow port 101 and the outflow port 102 are connected to the adjuster body 100.
On the side surface near the center of the first decompression unit 201
And the second pressure reducing portion 202 are formed at different positions so as to be orthogonal to the direction connecting the second pressure reducing portion 202 and the second pressure reducing portion 202.

[0004] The first decompression section 201 includes a first decompression chamber 103a formed in the center of the regulator main body 100 and a first decompression chamber 1.
Annular groove 104 engraved with a wall around
And a small-diameter portion having a large-diameter portion and a small-diameter portion,
A pressure reducing piston 105 inserted into the annular groove portion 03a; an adjusting spring (coil spring) 106 mounted on the annular groove 104 to bias a large-diameter portion of the pressure reducing piston 105;
And a cover 107 that covers the entire piston and is fixed to the adjuster main body 100.

[0005] A valve seat 108 is mounted on the distal end side of the small diameter portion of the decompression piston 105. The opening / closing operation of the valve is performed by coming and going. Also, the pressure reducing piston 105
Of the first decompression chamber 103a is formed by a horizontal passage 111 and a vertical passage 112 formed in the decompression piston 105. Pressure is the pressure receiving surface 113 of the large diameter part of the piston.
To join.

The regulator body 100 has a communication passage 114 communicating the inlet 101 with the inflow passage 109 of the first decompression chamber 103a, and a flow passage communicating the first decompression chamber 103a and the second decompression chamber 103b. A passage 115 and an outflow passage 116 that connects the second decompression chamber 103b and the outlet 102 are formed. The flow passage 115 is provided so as to be parallel to the inflow passage 109, and is connected to a safety valve 400 for discharging gas to the outside when the pressure of the first pressure reducing unit 201 is equal to or higher than a predetermined pressure.

According to the pressure regulator having the above structure, the high-pressure gas supplied from the cylinder (not shown) through the inlet joint 300 connected to the inlet 101 of the regulator body 100 is supplied to the inside of the regulator body. The pressure is reduced by the pressure reducing piston 105 which receives the force of the adjusting spring 106 in the first pressure reducing section 201 and is introduced into the flow path 1.
It is led to the second decompression unit 202 via 15.

In the second pressure reducing section 202, the distal end rod-shaped section 122 of the adjusting valve guide 120, which moves by the pressure received on the lower side of the diaphragm 150 and the force of the adjusting spring 121 for urging the upper side of the diaphragm 150, is formed. The pressure is reduced by opening and closing the valve hole 124 by the contacting adjustment valve 123, and the pressure is adjusted to a desired pressure.

[0009]

However, according to the pressure regulator having the above structure, it is difficult to reduce the size. That is, the size of the device is demanded to be small because the space at the place where the pressure regulator is installed is limited. However, according to the above structure, the width of the regulator body in the X direction in FIG. Then, the inflow passage 109 and the communication passage 114
And the position of the flow path 115 (particularly, the end of the communication path 114 and the wall surface of the flow path 115) are close to each other, and there is a problem that processing becomes very difficult.

To avoid this, as shown in a pressure regulator shown in FIG.
The safety valve 400 moves to the first side and communicates with the first pressure reducing unit 201.
It is conceivable to provide the flow path 115 to the second decompression section 202 in the flow path 401 of this embodiment.
There is a problem that the size of the adjuster main body 100 in the Y direction becomes longer with the movement of the installation position of 00. Further, with this structure, the annular convex portion (valve seat) 1 of the adjuster body 100
10 and the flow path 401 of the safety valve 400 are close to each other, so burrs generated when the flow path 401 is formed become a problem. If deburring is neglected, the burrs will be caught between the valve seat 110 and the valve seat 108, It can happen that the gas cannot be turned off and the pressure regulator loses its function.

Therefore, as shown in FIG. 5, the inventor of the present application has formed a first decompression chamber 11 for forming a first decompression section 20 in a cylindrical space in a two-stage decompression type pressure regulator. Valve seat 2 for opening and closing valve hole 63 formed in the main body
5 is disposed in the cylindrical space with the decompression piston 21 mounted on the tip, and the decompression piston 2 is disposed in the same cylindrical space.
A structure has been proposed in which the adjustment spring 22 for biasing 1 is positioned, and the opening position of the flow path 64 connecting the first decompression unit 20 and the second decompression unit 40 on the first decompression chamber 11 side faces the cylindrical space. .

According to the two-stage pressure reducing type pressure regulator, the first pressure reducing chamber 11 is formed in a cylindrical space, and the pressure reducing piston 21 and the adjusting spring 22 for urging the pressure reducing piston 21 are arranged in the cylindrical space. Thereby, the first decompression unit 20
The part can be made compact.

However, according to the above structure, as shown in FIG. 5, when the adjusting spring 22 is inclined, the pressure reducing piston 21 is inclined, and the pressure reducing piston 21 is accordingly adjusted.
Since the seat surface of the valve seat 25 at the front end of the valve seat is inclined with respect to the valve hole 63, there is a problem that the one-sided contact occurs between the valve seat 14 and the seat surface, and the stopping of gas deteriorates.

That is, since the adjusting spring 22 is formed of a helical coil spring, the parallelism of both end surfaces is not already obtained in a free length state. It has the property that the parallelism becomes worse. Accordingly, it is structurally difficult to uniformly shrink the coil spring, and the coil spring is inclined. The decompression piston 21 is connected to the first decompression chamber 11.
In order to move the inside without sliding, the diameter is formed smaller than the inner diameter of the first decompression chamber 11, so when the adjustment spring 22 is inclined, the decompression piston 21 is inclined and attached to the tip thereof. The seat surface of the valve seat 25 is inclined with respect to the valve seat 14.

The present invention has been made in view of the above circumstances, and has as its object to provide a piston-type pressure regulator having a structure capable of performing highly accurate gas pressure adjustment. .

[0016]

In order to achieve the above object, a first aspect of the present invention is to reduce the pressure by engraving a cylindrical space communicating with a valve hole in a regulator body and covering the cylindrical space with a cover. A pressure reducing piston having a valve seat for opening and closing the valve hole, an adjusting spring for biasing the pressure reducing piston, a flange receiving the valve hole side of the adjusting spring, And a spring receiver having a cylindrical guide wall which is continuous with the piston type pressure regulator, characterized in that the piston pressure regulator has the following configuration. The decompression piston is formed separately into a piston portion biased by an adjustment spring and an adjustment valve portion to which a valve seat is mounted. A projection is formed at the center of the piston portion on the side of the adjustment valve portion. The adjusting valve portion is formed so as to slide in the guide wall of the spring receiver.

According to a second aspect of the present invention, in the piston type pressure regulator according to the first aspect, the flange portion of the spring receiver is formed by an annular ring having an L-shaped section in cross section, and the opening side of the L-shaped piece faces the valve hole side. It is characterized by being mounted so as to be positioned.

According to the present invention, since the pressure reducing piston is formed separately from the piston portion and the adjusting valve portion, and the adjusting valve portion slides inside the guide wall of the spring receiver, the adjustment is performed. Even when the piston is tilted due to the tilt of the spring, the adjusting valve always moves inside the guide wall, thereby preventing the valve seat from tilting with respect to the valve hole. Further, since the convex portion is formed on the adjustment valve portion side in the center of the piston portion, when the piston portion is inclined, the movement of the adjustment valve portion can follow the subtle movement.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIGS. 1 and 2 show a two-stage depressurization type pressure regulator having a piston type pressure regulator according to an embodiment of the present invention in a first decompression unit, and a substantially prismatic regulator body ( Adjuster body) 10
Are provided with an inlet and an outlet, an inlet joint is connected to the inlet, and a pressure gauge for measuring the gas pressure on the high pressure side is connected to the upper side of the controller main body. FIG. 1 is an explanatory front view of a two-stage pressure reducing pressure regulator, and FIG. 2 is an explanatory sectional view taken along line AA 'of FIG.

A first pressure reducing section 20 and a second pressure reducing section 40 are formed on the front and rear faces in the axial direction of the adjuster body 10 having a substantially prismatic shape so as to be opposite to each other. The first decompression section 20 includes a cylindrical first decompression chamber 11 formed along an axis at the center of the adjuster main body 10, a decompression piston 21 inserted and arranged in the first decompression chamber 11, An adjusting spring (coil spring) 22 disposed in the chamber 11 for urging the pressure reducing piston 21, and a regulator cover 1 connected to the regulator body 10 so as to cover the pressure reducing piston 21.
2 are provided.

A characteristic feature of the present invention resides in that the pressure reducing piston 21 is formed separately from a piston portion 211 and a cylindrical adjusting valve portion 212. The piston portion 211 includes a piston portion main body 211a disposed in the first decompression chamber 11, a small-diameter portion 211b formed on the first decompression chamber side in connection with the piston portion main body 211a, and a piston portion main body 211a. And a large-diameter portion 211c formed on the side opposite to the first decompression chamber. A semi-spherical convex part 220 is formed at the center of the end surface of the small diameter part 211b of the piston part. Further, the adjustment valve portion 212 is formed in a cylindrical shape having a smaller diameter than the small diameter portion 211b, and the valve seat 25 is mounted on the distal end side. Then, the adjustment spring 22 is mounted between the annular step portion 23 formed between the piston portion main body 211a and the small diameter portion 211b, and the spring receiver 24 arranged on the bottom surface 13 side of the first decompression chamber 11, The piston part 211 is biased.

As shown in FIG. 3, the spring receiver 24 has a cylindrical guide wall 241 and a flange 242 at the end thereof. It slides inside the wall 241. The flange portion 242 is formed in a substantially rectangular shape, so that a gap is formed between the flange portion 242 and the first decompression chamber 11, and gas flows in from the gap.

The flange portion 242 has an L-shaped piece 243 at each of the four corners of the square, so that the L-shaped piece 243 is provided on the bottom surface 13 side of the first decompression chamber 11 and the center side of the first decompression chamber 11. Are arranged so that the opening side is located, and a space is formed on the bottom side. The flange portion 242 that contacts the adjustment spring 22 has a size that does not interfere with the small diameter portion 211b of the piston portion 211.

In the center of the bottom surface 13 of the first decompression chamber 11, a valve seat 14 is formed as an annular projection. Adjusting valve section 21
2, a valve seat 25 is attached to the tip of the valve seat 25 so as to contact the valve seat 14. A lateral passage 26 is formed in a direction perpendicular to the direction of the piston axis on the opposite side of the valve seat on the distal end side of the small diameter part 211b. A vertical passage 27 that penetrates between the end portions (pressure receiving surfaces) of the first pressure reducing chamber 11 is formed.
The internal pressure acts on the pressure receiving surface 28 of the piston portion 211. O-rings 29 and 3 are provided between the piston body 211a and the wall surface of the first decompression chamber 11, and between the side surface of the large-diameter portion 211c and the inner surface of the regulator cover 12.
0 are respectively attached to seal the space between the first decompression chamber and the outside.

The second pressure reducing section 40 is continuous with the circular concave portion 15 formed along the axis from the center side of the adjuster main body 10, the cylindrical portion 16 having a larger diameter than the circular concave portion 15, and the cylindrical portion 16. It has a large large diameter portion 17. Hole 42 in the center of the cylindrical part
The large diameter portion 17 is set to the tertiary side while the cylindrical portion 16 is set to the secondary side, and the adjustment valve 43 is inserted and arranged in the valve seat body 41. Valve seat body 41
A valve seat 44 is formed on the cylindrical portion side around the hole 42. A buffer spring 45 is mounted between the circular recess 15 and the adjustment valve 43. A low pressure side adjustment valve seat 47 is mounted on the side of the adjustment valve 43 opposite to the buffer spring 45, and comes into contact with the valve seat 44. First decompression unit 20
The inner diameter of the first decompression chamber 11 and the inner diameter of the cylindrical portion 16 of the second decompression section 40 are formed to have substantially the same size.

A rod-shaped adjustment valve guide 50 is inserted into the hole 42 of the valve seat body 41. The diaphragm 503 is sandwiched and fixed by the diaphragm mounting nut 501 and the diaphragm receiver 502, and the adjuster main body 10 is arranged so that the diaphragm 503 covers the large-diameter portion 17.
Is covered with a low-pressure regulator cover 18. At the center of the diaphragm mounting nut 501 is a relief valve seat 50.
The relief valve 505 is attached to the valve seat 504 so that the central taper portion abuts and the end on the adjustment valve side abuts on the adjustment valve guide 50. The relief valve 505 constitutes a safety valve that is opened when the inside of the large-diameter portion 17 of the second pressure reducing section 40 becomes higher than a set pressure.

A pressure adjusting screw 53 is screwed to the head of the low-pressure regulator cover 18. The pressure adjusting screw 53 is attached to the head of the low-pressure regulator cover 18 by advancing and retreating. The force generated in the adjustment valve guide 50 and the diaphragm 503 by the force can be changed.

On the side surface near the center of the adjuster main body 10, a direction orthogonal to a line connecting the first decompressor 20 and the second decompressor 40 (a direction toward the center of the adjuster main body 10).
An inflow port 60 is formed at a position shifted by 90 degrees from the inflow port 60, and an outflow port 61 is formed in a direction toward the center. At the inflow port 60, a communication passage 62 having a smaller diameter is formed concentrically and continuously to the center position of the regulator body 10, and the communication passage 62 is provided with a valve hole 63 formed concentrically with the first pressure reducing chamber 11. Through the center of the valve seat 14 on the bottom surface 13. The inlet 60 is provided with an inlet joint 70 and the outlet 6.
An outlet joint 71 is connected to 1.

The first decompression chamber 11 of the first decompression section 20 and the cylindrical portion 16 of the second decompression section 40 are formed in the regulator body 10 along the axial direction in parallel with the valve hole 63. Channel 64
Communication. The opening of the flow path 64 faces a space formed by mounting the spring receiver 24.

The large-diameter portion 17 of the second decompression portion 40 communicates with the outflow port 61 through an outflow passage 65 formed along the axial direction of the adjuster main body 10. Further, a flow passage 66 communicating with the communication passage 62 and the valve hole 63 is formed in the adjuster main body 10 at a position opposite to the outlet 61, and a pressure gauge 90 for measuring an inlet pressure (high pressure side) is mounted. It is in communication with the detection unit 67.

Next, the operation of the two-stage pressure reducing type pressure regulator having the above-described configuration will be described. The high-pressure gas supplied from the cylinder (not shown) through the inlet joint 70 to the two-stage depressurizing pressure regulator is connected to a communication passage 62 formed in the regulator main body 10.
And the valve hole 63 (primary chamber). The pressure of the gas flowing in here is determined by the flow path 66 and the pressure detecting section 67.
And can be measured by the pressure gauge 90. Since the pressure reducing piston 21 of the first pressure reducing section 20 moves in a direction away from the valve seat 14 by receiving the urging force of the adjusting spring 22, the gas flows into the first pressure reducing chamber 11, and the gas passes through the horizontal passage 26 and the vertical passage. It flows to the pressure receiving surface 28 side of the piston part 211 through 27. When the pressure is applied to the pressure receiving surface 28 of the piston portion 211 due to the inflow of gas, the piston portion 211 is moved rightward (FIG. 2) as the pressure rises, and the adjustment valve portion is moved to the right of the guide wall. Moving inside, the valve seat 25 comes into contact with the valve seat 14 to stop the flow of gas. The above operation is repeatedly performed, so that the gas in the first decompression unit 20 can be depressurized to the desired pressure, that is, the adjustment pressure (for example, about 5 kgf / cm ² ).

At this time, as shown in FIG.
Even when the piston portion 211 is inclined due to the inclination of the piston 2, the adjustment valve portion 212 that slides inside the guide wall 241 due to the projection 220 of the piston portion 211 always reciprocates in a fixed direction. Exercise, the valve seat 2 at the tip
5 does not incline with respect to the valve seat 14, so that a one-sided contact does not occur and gas stoppage does not deteriorate, and stable pressure adjustment can be performed.

The gas decompressed by the first decompression unit 20 flows into the cylindrical portion 16 of the second decompression unit 40 through the flow path 64. Since the urging force of the pressure adjusting spring 55 acts on the adjusting valve 43 via the adjusting valve guide 50, the valve seat 4
The low pressure side regulating valve seat 47 is separated from the cylinder body 4, and the gas guided to the cylindrical portion 16 is supplied from the inside of the valve body 41 to the hole 42.
And flows into the large-diameter portion 17. Then, when the diaphragm 503 receives pressure due to the inflow of gas, the diaphragm receiver 502 and the diaphragm mounting nut 501 move against the urging force of the pressure adjusting spring 55 as the pressure rises, and abut on the adjusting valve guide 50. Stop. As a result, the adjustment valve guide 50 retreats into the hole 42, moves the adjustment valve 43 by the urging force of the buffer spring 45, and the low pressure side adjustment valve seat 47 comes into contact with the valve seat 44 to stop the flow of gas. The above operation is repeatedly performed, and the gas in the large-diameter portion 17 of the second decompression portion 40 is adjusted to a desired pressure (e.g., an adjustment pressure).
The pressure can be reduced to about 0.7 to 3.5 kgf / cm ² ). The decompressed gas is taken out through the flow passage 65 and the outlet joint 71.

According to the two-stage pressure reducing type pressure regulator having the above structure, the pressure reducing piston 21 and the adjusting spring 22 are disposed in the first pressure reducing chamber 11 formed in the regulator main body 10, so that the adjustment is performed as in the conventional example. There is no need to provide an annular groove for inserting a spring.
The degree of freedom of the formation position of the flow path 64 connecting the 0 and the second decompression unit 40 can be increased, and the first decompression unit 20 can be made compact. In addition, since the annular groove provided in the pressure regulator described in the conventional example is not provided, the inclination of the pressure reducing piston that occurs when the adjusting spring 22 is inclined is determined by connecting the pressure reducing piston to the piston portion 211 and the adjusting valve portion. And the adjusting valve portion 212 is formed separately from the guide groove 2.
41 so as to slide inside the adjustment valve unit 2.
The seat surface of the valve seat 25 at the distal end of the twelve 12 does not tilt, so that it is possible to prevent the one-sided contact between the valve seat 14 and the seat surface.

Further, since the adjusting spring 22 is disposed between the step portion 23 of the pressure reducing piston 21 and the spring receiver 24, the adjusting spring 22 of the flow path 64 connecting the first pressure reducing portion 20 and the second pressure reducing portion 40 is formed. The opening on the one decompression chamber 11 side can face the space formed by the L-shaped piece 243 of the spring receiver 24, and even when the adjustment spring 22 is disposed in the first decompression chamber 11, the flow path 64 Can be prevented from being closed by the adjustment spring 22.

[0036]

According to the present invention, the pressure reducing piston is formed separately from the piston portion and the adjusting valve portion, and the adjusting valve portion slides inside the guide wall of the spring receiver. Even when the piston part is inclined due to the inclination of the adjustment spring, the adjustment valve part always moves inside the guide wall, and can prevent the valve seat from being inclined with respect to the valve hole,
Stable pressure adjustment can be performed. Further, since the convex portion is formed on the adjustment valve portion side in the center of the piston portion, when the piston portion is inclined, the movement of the adjustment valve portion can follow the subtle movement. Furthermore, in the first decompression chamber, since the adjustment spring is mounted via the spring receiver, even if the decompression piston and the adjustment spring are arranged in the first decompression chamber, the flow path may be blocked by the adjustment spring. Absent.

[Brief description of the drawings]

FIG. 1 is an explanatory front view showing the appearance of a two-stage pressure reducing pressure regulator as an example of an embodiment of the present invention.

FIG. 2 is an explanatory sectional view taken along the line AA ′ of the two-stage pressure reducing pressure regulator of FIG. 1;

FIG. 3 is a perspective explanatory view showing a spring receiver arranged in a first pressure reducing chamber of the piston type pressure regulator.

FIG. 4 is an explanatory longitudinal sectional view showing a case where an adjustment spring is inclined in the piston type pressure regulator according to the embodiment of the present invention.

FIG. 5 is an explanatory longitudinal sectional view showing the piston type pressure regulator when the adjustment spring is inclined.

FIG. 6 is an explanatory longitudinal sectional view of a conventional two-stage pressure reducing pressure regulator.

FIG. 7 is an explanatory cross-sectional view of the two-stage pressure reducing pressure regulator of FIG. 6;

FIG. 8 is a cross-sectional explanatory view showing another example of the two-stage pressure reducing pressure regulator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... regulator main body, 11 ... 1st decompression room, 12 ... regulator cover, 13 ... bottom surface, 14 ... valve seat, 15 ... circular recessed part, 16 ... cylindrical part, 17 ... large diameter part, 18 ... low pressure adjustment Container cover, 20: first decompression unit, 21: decompression piston,
Reference numeral 22: adjusting spring, 23: step portion, 24: spring receiver, 25: valve seat, 28: pressure receiving surface, 220
... projecting part, 241 ... guide wall, 242 ... flange part, 243
... L-shaped piece, 40 ... Second decompression part, 41 ... Valve body, 42
... Hole, 43 ... Adjusting valve, 44 ... Valve seat, 45 ... Buffer spring, 47 ... Low pressure side adjusting valve seat, 50 ... Adjusting valve guide, 55 ... Pressure adjusting spring, 501 ... Diaphragm mounting nut, 502 ... Diaphragm receiver, 50
3 ... diaphragm, 60 ... inlet, 61 ... outlet,
62 ... communication passage, 63 ... valve hole, 64 ... flow passage, 65 ... outflow passage, 66 ... flow passage, 70 ... inlet joint, 71 ... outlet joint, 90 ... pressure gauge

Claims (2)

[Claims] 1. A depressurization chamber is formed by engraving a cylindrical space communicating with a valve hole in a housing, and covering the cylindrical space with a cover, and a valve for opening and closing the valve hole in the depressurization chamber. A pressure reducing piston having a seat mounted thereon, an adjusting spring for biasing the pressure reducing piston, a flange receiving the valve hole side of the adjusting spring, and a spring receiver having a cylindrical guide wall continuous to the flange are disposed. A piston-type pressure regulator, wherein the pressure-reducing piston is formed separately into a piston portion urged by an adjustment spring and an adjustment valve portion to which a valve seat is mounted, and a center adjustment valve portion of the piston portion. A piston-type pressure regulator, wherein a convex portion is formed on the side, and the adjustment valve portion slides in a guide wall of the spring receiver. 2. The piston type according to claim 1, wherein the collar portion of the spring receiver is formed by an annular ring having an L-shaped section in cross section, and the opening side of the L-shaped piece is positioned on the valve hole side. Pressure regulator.