CN2175420Y

CN2175420Y - Device for measuring valve pressure

Info

Publication number: CN2175420Y
Application number: CN 93240982
Authority: CN
Inventors: 魏成杰
Original assignee: KAIFENG HIGH PRESSURE VALVE FACTORY
Current assignee: KAIFENG HIGH PRESSURE VALVE FACTORY
Priority date: 1993-10-09
Filing date: 1993-10-09
Publication date: 1994-08-24
Anticipated expiration: 2003-10-09

Abstract

The utility model relates to a device for testing valve pressure. A frame is composed of four pull rods and two vertical boards, wherein a multistage self-balancing pressure testing head is fixed on one vertical board, and a sealing board which can slide along the four pull rods is arranged on the frame. The sealing board can be pushed by a driving device and arranged on the end surface of the output side opening of a valve to be tested, and the pressure difference of a testing medium is used for sealing the end surface of the side opening of the valve to be tested. Because the utility model is provided with a leak detecting valve, the strength and seal test can be completed by once clamping. The generalization of the tests of valves with different specifications is realized by the utility model which has the advantages of simple operation and convenient clamping, and the utility model is especially suitable for the test of a valve with high voltage and large caliber.

Description

Device for measuring valve pressure

The utility model relates to a kind of pressure test device, particularly a kind of device that is applicable to all kinds of different size valve pressures of test.

Usually, valve for the different structure form adopts different pressure experimental devices, in process of the test, avoid valve to be squeezed for the valve that side flange is arranged in order to guarantee, the normal structure that adopts backpressure valve reveal flange, for the normal framework that constitutes by riser and pull bar that adopts of the valve of no side flange, by sealed at both ends plate of framework and seal pad upper sealing ring valve is advanced, outlet seals, and seal pad is produced certain extruding force by the hydraulic system compressed oil cylinder, reach the purpose of valve side mouth sealing, when testing, in order to make valve body in process of the test, not be subjected to bigger extruding force, need the pressure of regulator solution pressing system make oil cylinder to seal pad thrust end face in process of the test guarantee that the condition of sealing is issued to smaller value, because this method can not make the pressure medium synchronization lifting in compressed oil cylinder and the valve body, therefore, when valve internal pressure medium in the process of the test is low, valve also will bear the bigger extruding force of compressed oil cylinder, particularly to high pressure, large bore valves (as the power station valve) is when testing, test(ing) medium pressure produces about 577 tons of thrust to seal pad, make it sealing, act on seal pad sealing load need greater than medium thrust, obviously will producing so, big pressure common mechanical can't realize, if by the sealing of screw rod thrust, under the effect of test(ing) medium pressure, the plastic yield meeting that frame produces is concentrated and is reflected in seal pad with between the valve side mouth end face, and O-ring seals can not be sealed.This device is to the extruding force F of tested valve _PressWith valve cavity test(ing) medium pressure P _{Be situated between}Relation shown in curve α among Fig. 4.If adopt the endoporus sealing means, though valve is not subjected to bigger extruding force, the mounting or dismounting of seal head are inconvenience very, and the valve passage endoporus needs finishing.

The purpose of this utility model is to provide a kind of and makes valve side mouth end face can positiver sealing in the pressure test process, valve body does not bear obvious extruding force, and be suitable for the valve pressure test machine of all kinds of different size valves test, it not only can finish intensity and leakage test in a clamping, process of the test is simplified, and valve convenient mounting and clamping, laborsaving, rapid.

For achieving the above object, the utility model is by 4 pull bars, two risers constitute framework, wherein be fixed with a multistage self-equilibrating pressure text head on the riser, utilize pressure text head to produce the sealing that the test(ing) medium pressure differential realizes tested valve input side mouth end face, being equipped with on the framework can be along the seal pad of 4 pull bars slips, on another riser, be equipped with electronic and gearing, advance seal pad to make seal pad place the outgoing side mouth end face of tested valve by driving screw in the gearing, also be provided with a leak detector valve on this valve pressure test machine, this valve can be communicated with the tested valve gate output terminal.Multistage self-equilibrating pressure text head is to be made of piston cylinder, piston, piston also plays the seal pad effect simultaneously, piston cylinder is multistage cylinder, piston and every grade of piston cylinder phase-contact surface are provided with O-ring seal, piston is provided with the O RunddichtringO identical with piston cylinder progression with the end face of tested valve door sealing, by circle distribution 4-12 the intercommunicating pore that can be connected with pairing piston cylinder arranged between two O-ring seals, this end face center is provided with and connects the dish seam, the progression of piston cylinder can rationally be chosen according to the valve specification, and the piston cylinder center is provided with the medium input port.During applied voltage test, pressure medium can raise synchronously in tested valve intracoelomic cavity pressure medium and the piston cylinder, produces less inside and outside differential pressure, makes the piston trace movement, and the gap that compensation frame elastic deformation produces makes valve body side mouth end face positiver sealing.

In conjunction with the accompanying drawings the utility model is described in detail below by embodiment:

Fig. 1 is the utility model structural front view.

Fig. 2 is the utility model balance pressure text head working state structure synoptic diagram.

Fig. 3 is the structural front view of the utility model leak detector valve.

Fig. 4 is that test unit is to the extruding force of tested valve and the curve relation figure of tested valve cavity test(ing) medium pressure.

Leak detector valve in the utility model (1) with O RunddichtringO (21) and screw thread with can be connected along the seal pad (12) of four pull bars (10) slip and seal, and can be communicated with tested valve cavity, electric device (16) is housed on the riser (14), gearing (15), driving screw (13), driving screw (13) is connected with seal pad (12) by ball ring, and it is free to rotate, electric device (16) can drive gearing (15), driving screw (13) makes seal pad (12) move along pull bar (10), seal pad (12) end face is provided with the O-ring seal (2) of 3 different-diameters, be used for sealing the survey mouth end face of tested valve, the lower end is connected with adjustable support parts (11) by screw, and riser (6) lower end is connected with an adjustable v-type support unit (8) with screw (9).Piston cylinder in the pressure text head (5) is 3 grades and is connected with riser (6) by screw, piston (7) end face is provided with 3 O-ring seals (2), each O-ring seal and O-ring seal are adjacent and be seal stack by 8 intercommunicating pores (M) of circle distribution, every group seals corresponding first stage piston cylinder, the corresponding a cylinder of A group sealing, the corresponding b cylinder of B group sealing, the corresponding c cylinder of C group sealing, connect dish seam (4) and be used for that the scalability scope reserves connect the dish seam, can segment and increase test specification by the seal group of required diameter.Leak detector valve (1) version as shown in Figure 3, conduit (17) is welded on the spool (18), O RunddichtringO (19) outside seepage of medium when being used for preventing to open leak detector valve is housed on spool (18), spool (18) is threaded with valve body (20), and form linear sealing with the conical surface and valve body, spool (18) is opened the back sealing surface and is not contacted, medium in the tested valve body is discharged by spool interstitial hole and conduit (17) from hole (22), when spool is closed, can guarantee reliably that the medium in the tested valve body is hedged off from the outer world.

During work, tested valve (D) is lifted on seal pad (12), use adjustable support parts (8) between the piston (7), (11) supporting valve body, with electric device (16) is that power makes slipper seal plate (12) push valve body side mouth to, with O RunddichtringO (2) seal valve side mouth end face, and produce sealing force without it, after seal pad (12) and piston (7) are near valve body side mouth end face, opening leak detector valve (1) can be from water inlet charged pressure medium, when boosting, leak detector valve (1) is closed, can make a strength test, after the strength test, pressure medium is dropped to seal test pressure, close tested valve flashboard, open this machine leak detector valve (1) and can carry out the sealing property test tested valve.

The utility model is to the extruding force F of tested valve _PressWith valve cavity test(ing) medium pressure P _{Be situated between}Relation shown in curve β among Fig. 4.

The utility model can make tested valve not bear big extruding force all the time in test process, only bear the tight power of giving of trace, kept inside and outside differential pressure in a basic balance, thereby realize the positiver sealing of tested valve reveal mouth end face, owing to adopted multistage self-equilibrating cylinder structure, realized different size valve test all-purposeization, owing to be provided with leak detector valve in this device, institute simplifies process of the test so that a clamping can be finished intensity and leakage test again, the utility model is simple to operate, convenient mounting and clamping, laborsaving, be applicable to test, applied range to all kinds of valves rapidly,, be specially adapted to high pressure, the test of heavy caliber power station valve.

Claims

1, a kind of valve pressure test machine, by 4 pull bars (10), two risers (14), (6) constitute framework, it is characterized in that being fixed with on the riser (6) a multistage self-equilibrating pressure text head, being equipped with on the framework can be along the seal pad (12) of 4 pull bars slips, on another riser (14), be equipped with electronic and gearing, driving screw in the gearing (13) is connected with seal pad (12) and is free to rotate, this valve pressure test machine is provided with a leak detector valve (1), this valve can be communicated with the tested valve gate output terminal, multistage self-equilibrating pressure text head is by piston cylinder (5), piston (7) constitutes, piston cylinder is multistage cylinder, piston (7) is provided with O-ring seal (3) with every grade of piston cylinder phase-contact surface, piston (7) is provided with and the identical O RunddichtringO of piston cylinder (5) progression with the end face of tested valve door sealing, have this end face center of intercommunicating pore (M) that can be connected with pairing piston cylinder to be provided with by circle distribution between two O-ring seals and connect dish seam (4), the piston cylinder center is provided with the medium input port.

2, valve pressure test machine according to claim 1 is characterized in that the intercommunicating pore (M) that piston (7) is gone up by circle distribution is 4-12.

3, valve pressure test machine according to claim 1, it is characterized in that conduit (17) is welded on the spool (18) in the leak detector valve (1), O RunddichtringO (19) spool (18) and valve body (20) are housed for being threaded on spool (18), and form linear sealing with the conical surface and valve body (20).