CN202676412U

CN202676412U - Shut-off valve leakage rate on-line detection device

Info

Publication number: CN202676412U
Application number: CN 201220331035
Authority: CN
Inventors: 李东军
Original assignee: DANDONG LANSEAS ELECTRICAL APPLIANCE Co Ltd
Current assignee: DANDONG LANSEAS ELECTRICAL APPLIANCE Co Ltd
Priority date: 2012-07-10
Filing date: 2012-07-10
Publication date: 2013-01-16
Anticipated expiration: 2022-07-10

Abstract

The utility model provides a shut-off valve leakage rate on-line detection device, and problems that detection time is long, a leakage point cannot be determined, working efficiency is low and the like in the prior art are solved. The device comprises valve bodies which are connected with a pressure measurement inlet pipeline and a pressure measurement outlet pipeline and valve cores which are packaged in the valve bodies through inlet and outlet sealing rings. The technical points of the device are that the valve body is provided with a pressure measuring hole with an interface valve, an outlet terminal of the interface valve is connected with a pressure measuring part and a pressure relief valve respectively through a three-way part to form a communication pipeline. The structure is compact, the design is reasonable, through a simple gating operation on the interface valve, a leakage rate detection requirement of a single shut-off valve or a plurality of shut-off valves in parallel connection can be satisfied, a positioning speed of a leakage point is fast, on-line detection sensitivity is high, the accurate detection of the leakage rate of the shut-off valve in real time is ensured, and the detection precision of a flow metering device is ensured. Since double valve groups are substituted by sealing surfaces of inlet and outlet sealing rings of the single valve, the blindness of determining the leakage point in maintenance is avoided, detection cost is reduced, and the working efficiency of verification is remarkably raised.

Description

Stop valve leak rate on-line measuring device

Technical field

The utility model relates to the pick-up unit of a kind of check gauging gas flow accuracy, particularly a kind of stop valve leak rate on-line measuring device of the gas flow accuracy for verifying the metering and measuring equipments such as flow standard device, flow calibrating device and flowrate calibrating device belongs to flow metering detection technique field.

Background technology

Existing be used for the measurement of gas flow mainly contain the checkout equipments such as flow standard device, flow calibrating device and flowrate calibrating device, these measurement of gas flow devices use stop valve to cut off parts as the connection of metering pipeline in a large number, must verify in the use whether it is that sealing is qualified.Can the sealing property that real-time online detects stop valve self be directly connected to the accuracy of above-mentioned gas flow apparatus.At present, generally adopt the bivalve series system at the key position of signal piping, the pipeline section that is tightly connected between two valves arranges the leakage rate that pressure tap and a corresponding cover detection part detect bivalve.Because the pipeline section volume is relatively large, detection time is longer, and it is many to add that bivalve doubles testing cost, and device volume strengthens, and is restricted so use bivalve to detect.Also having some devices to adopt integral body to suppress mode leaks hunting, because volume is larger, detection time is longer, and can only measure to the signal piping of a plurality of valve parallel connections whether leak source is arranged, so can not determine it is that valve leaks, determine that blindly leak source brings very large difficulty to service work.

The utility model content

The purpose of this utility model provides a kind of stop valve leak rate on-line measuring device, long, the problems such as leakage point can't be determined, inefficiency detection time that existing signal piping exists have been solved, its compact conformation, reasonable in design, easy and simple to handle, the leak source locating speed is fast, and is in real time, the online detection, sensitive, detect the leak rate of stop valve exactly, reduce testing cost, guaranteed flow measurement device accuracy of detection and checking work efficiency.

The technical solution adopted in the utility model is as follows: this stop valve leak rate on-line measuring device comprises the valve body that is connected with pressure measurement import and export pipeline and is encapsulated in the spool in the valve body by inlet seal circle, exit seal circle, its technical essential is: described valve body is provided with the pressure tap of interface valve, the endpiece of interface valve connects respectively pressure measurement parts and blowdown valve by threeway, consists of connecting pipeline.

The blowdown valve endpiece of described connecting pipeline be communicated with atmosphere or with the pipeline connection that is lower than blowdown valve entrance point pressure.

The valve body of described connecting pipeline is respectively the first valve body, the second valve body and n valve body, endpiece with first interface valve, the second interface valve and the n interface valve of the corresponding connection of pressure tap of each valve body, the first threeway, the second threeway and n threeway by correspondence is communicated with respectively, and shares cover pressure measurement parts and a blowdown valve.

Advantage and the good effect that the utlity model has are: because valve body of the present utility model is connected with pressure measurement import and export pipeline, be provided with the pressure tap of interface valve on the valve body, and make the endpiece of interface valve connect respectively pressure measurement parts and blowdown valve by threeway, consist of connecting pipeline, so its compact conformation, reasonable in design.By the easy gating operation of docking port valve, just can satisfy the leak rate testing requirement that adapts to stop valve normal pressure, negative pressure and gas with various medium, not only the leak source locating speed is fast, and online detection sensitivity is high, the leak rate of guaranteeing to detect in real time, exactly stop valve, guarantees the precision that flow measurement device detects.Because the sealing surface of the import and export O-ring seal that adopts single valve replaces the leak detection of bivalve group, so when improving detection sensitivity, avoided determining when safeguarding the blindness of leak source, reduced testing cost, significantly improve the checking work efficiency.Therefore, the utility model has solved long, the problems such as leakage point can't be determined, inefficiency detection time that existing flow apparatus signal piping exists, and applies easily.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is a kind of opening state structural representation of the present utility model;

Fig. 2 is the dissengaged positions structural representation of Fig. 1.

Fig. 3 is a kind of structural representation that a plurality of stop valve gatings detect.

Sequence number explanation among the figure: 1 valve body, 2 inlet seal circles, 3 spools, 4 pressure taps, 5 pressure measurement parts, 6 blowdown valves, 7 threeways, 8 interface valves, 9 exit seal circles.1-1 the first valve body, 1-2 the second valve body, 1-n n valve body, 8-1 first interface valve, 8-2 the second interface valve, 8-n n interface valve, 10-1 the first threeway, 10-2 the second threeway, 10-n n threeway.

Embodiment

Describe concrete structure of the present utility model in detail according to Fig. 1～3.This stop valve leak rate on-line measuring device comprises the valve body 1 that is connected with pressure measurement inlet ductwork, export pipeline and is encapsulated in spool 3, interface valve 8, pressure measurement parts 5 and blowdown valve 6 in the valve body 1 by inlet seal circle 2, exit seal circle 9, and the parts such as connecting pipe.Valve body 1, spool 3 and import and export O-

ring seal

2,9 form airtight cavity, and as the rate cavity that leaks hunting, the volume of cavity and connecting pipe can be demarcated by liquid.

Wherein valve body 1 comprises and the rotating mechanism (not shown) of the interface agency that is connected with the import and export pipeline and 3 actions of control spool, and its specification, shape should be determined according to actual operation requirements.Valve body 1 is provided with the pressure tap 4 of interface valve 8, and the endpiece of interface valve 8 connects respectively pressure measurement parts 5 and blowdown valve 6 by threeway 7, consists of connecting pipeline.Pressure measurement parts 5 can adopt pressure transducer, transmitter or other pressure instrumentations that satisfies precision index, and it is withstand voltage to meet the working pressure of medium, and range is no more than the working pressure of medium; Accuracy preferably is better than or equals 0.1%FS.Pressure measurement parts 5 accuracy height are conducive to detect tiny leakage, improve accuracy of detection and detection efficiency, but the accuracy of measurement of pressure measurement parts 5 are too high, and then price is high, is unfavorable for cost control.

Have in the middle of the spool 3 one with the through hole of working line same specification, when spool 3 turns to the direction of its through-bore axis and working line dead in line, stop valve conducting (as shown in Figure 1), when spool 3 turns to its through-bore axis and the orthogonal direction of working line axis, have flexible import and export O-

ring seal

2,9 with valve body 1 and spool 3 sealings, stop valve is dissengaged positions (as shown in Figure 2).

In order to realize operating by docking port valve 8 easy gatings, satisfy the leak rate testing requirement of the normal pressure, negative pressure and the gas with various medium that adapt to stop valve, so that the expansion scope of application, the endpiece of the blowdown valve 6 of connecting pipeline can be communicated with atmosphere or with the pipeline connection that is lower than blowdown valve entrance point pressure.

The detection operation steps is as follows:

First spool 3, interface valve 8 and blowdown valve 6 are placed off-position;

Then slowly open interface valve 8, the leak hunting airtight cavity of rate of valve body 1 and spool 3 and import and export O-

ring seal

2,9 conducts that form is communicated with pressure measurement parts 5, observation, record the indicating value that pressure measurement parts 5 provide;

Slowly open again blowdown valve 6, make airtight cavity as the rate of leaking hunting be communicated with the pipeline that atmosphere or connection are lower than airtight cavity pressure, after the pressure equilibrium, close blowdown valve 6 and interface valve 8, at this moment begin to record the force value of pressure measurement parts 5;

If stop valve place pipeline is malleation during flow apparatus work, then flow apparatus stop valve inlet ductwork pressure is elevated to working pressure; If stop valve place pipeline is negative pressure during flow apparatus work, then stop valve place line pressure is taken out low to the negative pressure working pressure;

The pressure output value of continuous recording time and corresponding pressure measurement parts 5.

According to the speed that airtight cavity volume and pressure as the rate of leaking hunting change, can calculate in real time, accurately and rapidly the leak rate of stop valve, and according to the requirement of detected flow apparatus to leak rate, make and whether verify qualified conclusion.

If detected flow apparatus as shown in Figure 3, the valve body of connecting pipeline is respectively the first valve body 1-1, the second valve body 1-2, a plurality of valve bodies such as n valve body 1-n, then can with the first interface valve 8-1 of the corresponding connection of pressure tap of each valve body, the second interface valve 8-2, the endpiece of each interface valve such as n interface valve 8-n, respectively by the first corresponding threeway 10-1, the second threeway 10-2, n threeway 10-n is communicated with setting, and by the first threeway 10-1 and threeway 7 shared cover pressure measurement parts 5 and blowdown valves 6, can pass through first interface valve 8-1, the second interface valve 8-2, the gating of each interface valve such as n interface valve 8-n is measured every stop valve respectively.

As required, whole detection leak rate process can adopt conventional control loop to realize automatically control.

If the transmission medium of stop valve is inflammable gas, then the exhaust outlet end of blowdown valve 6 will meet explosion-proof relevant criterion requirement.If the transmission medium of stop valve is special gas, then open blowdown valve 6 before, guarantee that the pressure in the cavity is higher than external pressure, guarantee that extraneous gas does not blow back into cavity.

If a plurality of valve bodies such as the first valve body 1-1 of connecting pipeline, the second valve body 1-2, n valve body 1-n carry out parallel connection by the first threeway 10-1, the second threeway 10-2, n threeway 10-n etc., then with interface valves such as first interface valve 8-1, the second interface valve 8-2 of the corresponding connection of pressure tap of each valve body, n interface valve 8-n, contract fully when not hunting leak state, when needing leak detection, should open one by one in order respectively tested interface valve and hunt leak, this moment, other interface valves of not hunting leak were in closed condition.

Claims

1. stop valve leak rate on-line measuring device, comprise the valve body that is connected with pressure measurement import and export pipeline and be encapsulated in the spool in the valve body by valve body inlet seal circle, exit seal circle, it is characterized in that: described valve body is provided with the pressure tap of interface valve, the endpiece of interface valve connects respectively pressure measurement parts and blowdown valve by threeway, consists of connecting pipeline.

2. stop valve leak rate on-line measuring device according to claim 1 is characterized in that: the blowdown valve endpiece of described connecting pipeline be communicated with atmosphere or with the pipeline connection that is lower than blowdown valve entrance point pressure.

3. stop valve leak rate on-line measuring device according to claim 1, it is characterized in that: the valve body of described connecting pipeline is respectively the first valve body, the second valve body and n valve body, endpiece with first interface valve, the second interface valve and the n interface valve of the corresponding connection of pressure tap of each valve body, the first threeway, the second threeway and n threeway by correspondence is communicated with respectively, and shares cover pressure measurement parts and a blowdown valve.