JPH0473478A - Performance inspection method for gas cock - Google Patents

Abstract

PURPOSE:To enable inspection to be performed about sealing performance separately for an auxiliary valve and a main valve by using the first socket having a projection and the second socket having no projection. CONSTITUTION:An inspection socket 60 is constituted of the first and second sockets 61 and 62, and the first socket 61 has a valve opening spindle 68 at the center of the cylindrical connection hollow body 67, constituting a projected section. The stroke of a cylinder 63 is so adjusted as to keep the valve opening spindle 68 of the first socket 61 pressing an auxiliary valve 22 mounted onto the plug 4 of a gas cock G. In this case, the compressed air is supplied to the gas cock G, and air leakage therefrom is checked and displayed with a main valve inspection indicator 19. According to the aforesaid construction, the sealing performance of a main valve 2 can be inspected. Then, a selector valve 141 is changed over to cause the advance of the cylinder 63 and the second socket 62 is mounted onto the plug 4 of the gas cock G. In addition, negative pressure is applied to the gas cock G with the main and auxiliary valves 2 and 22 of the cock G closed for inspection air leakage at a gap between the main and auxiliary valves 2 and 22, thereby enabling inspection to be performed separately about the sealing performance of the auxiliary valve 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application and Summary of the Invention 1 The present invention relates to a method for testing the performance of gas valves, in which the sealing performance of the main valve incorporated in the gas valve and the auxiliary valve downstream thereof is checked. This allows each gas valve to be inspected separately, thereby making it possible to accurately inspect the performance of gas valves.

[Prior Art and Problems] Recently, gas valves that can be opened by simply connecting a one-touch coupling socket to a plug have become popular. There is a structure as shown in FIG.

A gas flow path (14) is formed in the plug body (11) that connects from the gas inlet (11) side to the plug (4) at the downstream end, and a spring (14) is formed in the cylindrical plug (4). 32) accommodates a slide valve type main valve (2) that is biased downstream, and the main valve (2) is located in a linear airtight sliding area (15) located at the plug (4) portion. It is designed to slide in an airtight manner.In addition, a plug (
A lift valve type auxiliary valve (22j) is disposed to close a valve seat opening (40) formed at the downstream end of the valve 4).

As shown in Fig. 8, when the socket (3) is not connected, the main valve (3) is biased downstream by the spring (32).
2) is located in the airtight sliding area (15) within the plug (4) and is in a flow path blocking state, and the auxiliary valve (22) closes the valve seat port (40) on the downstream side thereof, Thereby, the gas flow path (14) is maintained in a double sealed state by both the main valve (2) and the auxiliary valve (22).

Next, as shown in Figure 9, insert the socket (3) into the plug (
4), first, the lift valve type auxiliary valve (22)
is pushed by the shaft (31) in the socket (3) and the valve seat opening (4
0). In this state, when the socket (3) is further pushed in, the main valve (2) escapes to the upstream side of the airtight sliding area (15), and as a result, the auxiliary valve (22) and the main valve (2)
Both valves are in the open state, and the plug body (1) is connected to the socket (3).
) side is supplied with gas.

In the above method, the sealing performance of the gas valve in the closed state is inspected in order to prevent gas leak accidents when the gas valve is in use. The inspection is performed, for example, on the auxiliary valve (2
This can be done by applying a pressure difference between the upstream and downstream sides of both the main valve (2) and the main valve (2), and detecting any gas leakage that occurs on the low pressure side at this time.

However, in the above inspection method, the sealing property is inspected while both the auxiliary valve (22) and the main valve (2) are kept in the closed state. There was a problem in that it was not possible to grasp the exact seal performance.

The present invention has been made in view of this point, and is based on the r plug (
4) a lift valve type auxiliary valve that closes the valve seat opening (40) formed on the inner periphery of the tip from the upstream side; A method for inspecting the sealing performance of a gas valve in which a main valve is provided to open and close the upstream gas flow path, and the main valve opens later than the auxiliary valve when the auxiliary valve is pushed in a predetermined distance. The object of the present invention is to enable the sealing performance of the auxiliary valve and the main valve to be inspected separately, thereby enabling accurate sealing performance inspection.

[Means] The technical means of the present invention for solving the above problem is to use a first socket having a convex portion at the connection tip and a second socket not having a convex portion, and connecting the first socket to a plug (4 )
a main valve plug inspection step in which a pressure difference is created between the gas inlet (11) of the plug body (1) and the first socket with only the lift valve type auxiliary valve opened at the convex portion of the main valve plug connected to the main valve plug; , the auxiliary valve inspection step is performed in which the second socket is connected to the plug (4) and the main valve and the auxiliary valve are both closed, and the second socket is brought into a negative pressure state.

[Effect] The above technical means works as follows.

Connect the first socket, which has a protrusion on the connection tip, to the plug (4
), and only the lift valve type auxiliary valve is opened at the convex portion. That is, only the main valve located upstream of the auxiliary valve is kept closed. Then, in this state, a pressure difference is applied between the gas inlet (11) side and the first socket side of the stopper body (1), and the main valve inspection step is executed. Then, the pressure difference acts only on the main valve in the closed state, and thereby the sealing performance of the main valve can be tested.

Next, when the second socket is connected to the plug (4), both the auxiliary valve and the main valve are closed because the connection tip of the second socket is not provided with a protrusion like the first socket. The valve is maintained in a double closed state.

In this double-closed state, negative pressure is applied to the second socket connected to the plug (4), thereby executing the auxiliary valve inspection step. Then, the pressure on the second socket side decreases compared to the pressure in the gap between the auxiliary valve and the main valve on the upstream side thereof, and this pressure difference becomes a state in which it acts only on the auxiliary valve. If the sealing performance of the auxiliary valve is insufficient,
Air in the gap between the auxiliary valve and the main valve upstream thereof is sucked by the negative pressure and leaks to the second socket, so that the sealing performance of the auxiliary valve can be tested.

In the above operation, the auxiliary valve inspection process is executed after the main valve inspection process, but this order does not necessarily have to be followed, and the main valve inspection process can be executed after the auxiliary valve inspection process. You may do so. If the gas valve to be inspected passes both of the above inspections, it is determined that the sealing properties of both the auxiliary valve and the main valve are appropriate.

[effect〕 The present invention has the following unique effects.

Since the sealing performance of the auxiliary valve and the main valve can be tested separately, the sealing performance of the gas valve can be tested more reliably.

[Example] Next, a detailed explanation of the above-mentioned invention will be explained. Ru.

FIG. 1 and FIG. 2 show an inspection device implementing the present invention.

A holder (51) is provided on the top surface of the inspection table (5) for attaching a gas valve to be inspected.
As shown in FIG. 5, an insertion opening (55) into which the upstream end of the gas plug is inserted is formed on the upper surface of the gas valve 51). A pipe connection hole (57) (581) on the opposite side of the insertion port (55) in the holder (51) is connected to a gas circuit to be described later.

Further, above the holder (51) is a pressing member (53) that is raised and lowered by a cylinder (52) to fix the gas plug in the installed state.
is provided.

At the rear of the holder (51), as shown in FIGS. 2 and 3, there is a first. A testing socket (60) consisting of a second socket f6t1 +62) is provided.

1st. The second sockets (611 (62) are attached to the slide table (65) at intervals in the lateral direction, and the slide table (65) is connected to the rodless cylinder (
66) so that it can move laterally. Also, the above 1. The second sockets (61) and (62) are pushed forward by cylinders +63) and +64+.

The first socket (61) is constructed as shown in FIG. 4, and a valve opening shaft (68) is provided in the center of the cylindrical connecting tube (67) and projects toward the tip. Valve opening shaft (
68) constitutes the convex portion described in the technical means section already mentioned.

The inspection device of this embodiment is a gas valve shown in FIG.
When the flow rate of gas flowing into the plug body (1) increases due to the gas rubber pipe on the downstream side coming off, etc., the ball valve (26) is blown by the gas flow and closes the valve seat port (27). It has a structure suitable for inspecting a gas valve incorporating an overflow prevention valve (25).

In order to be able to inspect a gas valve incorporating the overflow prevention valve (25), a gas circuit as shown in FIG. 6 is formed in the inspection apparatus of the illustrated embodiment. ~ A main valve (36) is inserted into the high pressure circuit (35) drawn out from the compressor (not shown), and the downstream circuit of the main valve (36) performs a performance test of the overflow prevention valve (25). an overflow prevention valve inspection circuit (72) for inspecting the overflow prevention valve; a main valve inspection circuit (73) for inspecting the sealing performance of the main valve (2); It branches into a driving gas circuit (74).

The overflow prevention valve inspection circuit (72) includes a first pressure reducing valve (45).
) and the first pressure gauge (46
) are inserted, and these downstream circuits include an operating flow rate test circuit (75) that tests the flow rate required to close the overflow prevention valve (25), and an overflow check circuit (75) that tests the flow rate required to close the overflow prevention valve (25). It branches into a leak test circuit (76) that tests for leaks in the prevention valve (25), and the operating flow test circuit (75) includes a second pressure reducing valve (47) and a second pressure reducing valve (47) that measures and displays the pressure after pressure reduction. 2 pressure gauges (48) are inserted. Further, a throttle valve (81) controlled by a controller (80) is inserted downstream of the second pressure reducing valve (cow 7), and a first laminar flow pipe (82) and an opening/closing valve are inserted downstream of the throttle valve (81). It is connected to the holder (51) via a valve (83). Furthermore, the first laminar flow tube (8
2) Two flow rate measurement circuits (86) (87
1 corresponds to each of these separately. Second switching valve 184
1 (connected to a flow rate measuring device (88) via AS+, and the first and second display panels f901 (911) are connected to the flow rate measuring device (88).

Next, the leak test circuit (76) in the overflow prevention valve test circuit (72) is as follows: third pressure reducing valve (93) - second laminar flow pipe (94) -> on-off valve (95) - holder ( 51), and the pressure after pressure reduction by the third pressure reducing valve (93) is displayed on a third pressure gauge (96). or,
Two flow rate measurement circuits (
97) (981 is the switching valve corresponding to each of these (
841 (via 851 the above-mentioned flow rate measuring device (88)
is connected to.

Next, a fourth pressure reducing valve (1101) and a fourth pressure gauge fl181 that displays the pressure in the flow path after the pressure is reduced by the pressure reducing valve (1101) are provided at the upstream part of the main valve inspection circuit (73). It is being

In addition, a second socket (6
2) is connected to an auxiliary valve inspection circuit (77) for inspecting the sealing performance of the auxiliary valve (22), and the circuit following the auxiliary valve inspection circuit (77) includes a seventh pressure reducing valve +1271 and a vacuum valve. A pump (1281) is installed, and the pressure reduced by the seventh pressure reducing valve t1271 is measured by the seventh pressure gauge [
1291 is displayed. Further, a leak measuring device (16) that measures and displays air leakage from the second socket (62) side is connected to the auxiliary valve inspection circuit (77).

Next, the first. The driving gas circuit (74) for moving the second socket f611 (621) will be explained.

A sixth pressure reducing valve (13) is provided upstream of the driving gas circuit (74).
01 is inserted, and its downstream circuit is a cock holding circuit f1311 that controls the cylinder (52) for holding down the gas stopper (G) set in the holder (51).
And the first. It branches into a socket control circuit f1321 that controls the operation of the second socket (cylinders f631 and f64 for moving the 611f621 forward and backward), and a slide table control circuit (133) that further controls the rodless cylinder (66).

A one-way throttle valve (1361) corresponding to one boat of the cylinder (52) and a one-way throttle valve corresponding to the other boat of the cylinder (52) are connected to the cock holding circuit (1311) via a switching valve (135). It is connected to f1341.

Next, the socket control circuit that controls the operation of cylinder +631 f641 (1321 is the switching valve +1411 and 2
The two one-way throttle valves (1421 (1431)
1 and one-way throttle valves connected in series with these valves (1
471+148+ +1491 to the first socket (
61) is connected to the cylinder (63).

In addition, the slide table control circuit (1331 is the switching valve +
1511 and one-way throttle valve (1521 (connected to two boats of the rodless cylinder (66) via 1531).

Next, the actual use of the gas valve performance inspection device of the above embodiment will be explained.

First, attach the gas inlet (11) side of the gas valve (Gl) as shown in FIG.
is switched, and the cylinder (52) presses the gas valve fGl onto the holder (51). Next, the switching valve f151
1 to switch the slide table control circuit f1331
By supplying pressurized air from the rodless cylinder (66) to one boat of the rodless cylinder (66), the first socket (61) is brought into a state facing the plug (4) of the gas valve fGl. Next, move the first socket (61) forward by switching the switching valve (144) (1451f1461), and use the valve opening shaft (68) protruding from the tip of the first socket (61) to plug the gas valve (Gl). (4) Push open the auxiliary valve (22).Then, the auxiliary valve (22) will open the main valve (2) on the upstream side.
At the same time, it moves against the spring (33) to open the valve, and the force required to open the valve is maintained in the state displayed on the valve opening force indicator (38).

Next, the on-off valve (18) connected to the first socket (61)
)open.

Next, the on-off valve (83) inserted in the downstream part of the working flow rate inspection circuit (75) is opened, and the pressure air adjusted to a head pressure of 200 mm Aq by the second pressure reducing valve (47) is passed through the throttle valve (81). ) - first laminar flow pipe (82) - on-off valve (83) - holder (51) -> first socket (61) - on-off valve (18). In addition, a switching valve (841 (85)) inserted into a circuit branched from the first laminar flow pipe (82) is switched to connect the branch circuit to the flow rate measuring device (88).

This allows the flow rate of the air flowing through the first laminar flow tube (82) to be measured by the flow rate measuring device (88).

In this state, the flow rate of pressurized air is gradually increased while being controlled by the throttle valve (81), and when the flow rate increases and the ball valve (26) of the overflow prevention valve (25) operates to shut off, The measurement results of a flow rate measuring device (88) that measures the flow rate of pressurized air are displayed on the first display panel (90).

Next, switch the switching valve (841f851) so that the second laminar flow pipe (94) inserted into the leak test circuit (76) is connected to the flow rate measuring device (88), and in this state, turn on/off valve (95). This opens the third pressure reducing valve (93).
Pressure air adjusted to 0 mmAq is applied to the gas plug (Gl) of the holder (51).Then, the minute amount of air flow flowing through the gas plug fGl at this time is measured by the flow rate measuring device (88).
) and display it on the second display panel (91). As a result, the gas valve (Gl overflow prevention valve) is in the closed state.
25) The sealing performance can be inspected.

Next, the first socket (61), which is connected to the plug (4) of the switching valve f144] +1451 (switch 1461 and gas valve fG), is removed from the plug (4), thereby closing the valve. Reset the overflow prevention valve (25). Please note that the first socket (61) is connected to the plug (
4), a reset mechanism (not shown) built into the gas valve fGl operates to reset the overflow prevention valve (25).

Next, the first socket (61) is attached to the gas plug (Gl plug (4)) again, and air is supplied from the operating flow rate inspection circuit (75) to the gas plug (G) in the same manner as described above. Confirm that the flow rate measuring device (88) detects the flow rate, thereby confirming that the overflow prevention valve (25) has been reset.

Next, switching valve f1441 +1451 +1461
By controlling
The valve opening shaft (68) of the first socket (61)
The auxiliary valve (22) attached to the plug (4) is pushed in by 1 mm. That is, only the auxiliary valve (22) is opened and the main valve (2) is kept closed.

In this state, the 35
00n+mAq of pressurized air is supplied to the gas valve (Gl),
Inspect the air leakage from the gas valve (Gl) and display the result on the main valve inspection indicator (1) connected to the first socket (61).
9). Thereby, the sealing performance of the main valve (2) can be inspected.

Next, the first socket (61) is removed from the gas plug (Gl plug (4)) and the switching valve (151+ is switched to drive the rodless cylinder (66), so that the second socket (62) is connected to the gas plug (Gl). GL plug (4).Then, switch the switching valve f1411 inserted into the branch circuit from the socket control circuit f1321 to advance the cylinder (64) so that the second socket (62) is connected to the gas valve f.
Leave it attached to the Gl plug (4).

In this state, the main valve (2) and auxiliary valve (2) of the gas valve fGl
2) are both closed, and in this state negative pressure (-300) is applied from the auxiliary valve inspection circuit (77) to the gas valve fG
Multiply by ma+Hg). Then, even if the sealing performance of the main valve (2) is sufficient, if the sealing performance of the lift valve type auxiliary valve (22) is insufficient, the main valve (2) in the plug (4) Since the air in the gap between the auxiliary valve (22) and the auxiliary valve (22) is sucked in by the auxiliary valve inspection circuit (77) and leaks out, this is detected and indicated by the leakage meter (16).

This allows the main valve (2) and the lift valve type auxiliary valve (22
) seals can be inspected separately.

In the above embodiment, when inspecting the sealing performance of the main valve (2), positive pressure was applied to the gas valve [G] from the main valve inspection circuit (73). Negative pressure may be applied to the stopper fGl; in short, it is sufficient to create a pressure difference between the upper and lower flow path portions of the main valve (2).

[Brief explanation of the drawing]

Fig. 1 is a front view of an inspection device implementing the present invention, Fig. 2 is a side view thereof, Fig. 3 is a plan view of the main parts, Fig. 4 is a sectional view of the first socket (61), and Fig. 5 is a sectional view of the holder (51), FIG. 6 is a gas circuit diagram, FIG. 7 is a sectional view of a gas plug to be inspected by the inspection device of the embodiment of the present invention, and FIGS. 8 and 9 are overflow It is a sectional view of a gas valve without a prevention valve (25), and in the figure, (1) ... the main body (4) ... the plug (11) ... the gas inlet (40) ... the valve seat port.

Claims (1)

[Claims] Valve seat opening (40) formed on the inner circumference of the tip of the plug (4)
A lift valve-type auxiliary valve that closes the auxiliary valve from the upstream side, and a main valve that opens in conjunction with the push-opening operation of the auxiliary valve and opens and closes the gas flow path on the upstream side of the auxiliary valve. In a method for inspecting the sealing performance of a gas valve whose main valve opens later than the auxiliary valve when pushed in a predetermined distance,
Using a first socket that has a protrusion on the connection tip and a second socket that does not have a protrusion, connect the first socket to the plug (
4) Main valve plug inspection in which a pressure difference is created between the gas inlet (11) of the plug body (1) and the first socket with only the lift valve type auxiliary valve opened at its convex part. process, and an auxiliary valve inspection process in which the second socket is connected to the plug (4) and the main valve and the auxiliary valve are both closed, and the second socket side is brought into a negative pressure state. Performance testing method.