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Pre-inflatable pneumatic reversing valve

A reversing valve, inflatable technology, applied in the direction of valve details, multi-way valves, valve devices, etc., to achieve the effect of reducing unstable states

Inactive Publication Date: 2011-07-13
SHANGHAI INST OF PROCESS AUTOMATION & INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the beginning of switching, the nozzle throat has not yet established the rated verification flow, which will cause a verification error

Method used

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  • Pre-inflatable pneumatic reversing valve
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  • Pre-inflatable pneumatic reversing valve

Examples

Experimental program
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Effect test

Embodiment Construction

[0011] Depend on figure 1 , figure 2 As shown, a pre-inflated pneumatic reversing valve includes a valve body 5, a valve core 13, and a piston 11 fixed as a whole with the valve core 1, and the first valve cover 14 is respectively connected to the first valve seat 15, the second The first valve group V composed of valve seat 6 1 and the second valve group V 2 , the photoelectric signaling device 2 and the baffle plate 1 fixed as one with the photoelectric signaling device 2 and the valve core 13 are characterized in that, in the second valve group V 2 A third valve group V consisting of a third valve seat 10 and a fixed valve cover 9 is added to the right side of the 3 , the first bonnet 14 is a movable bonnet, the left side of the movable bonnet is connected with the fixed block 8 through the spring 6 sleeved on the spool 13, the spool 13 on the left side of the movable bonnet A retaining ring 3 is fixedly arranged.

[0012] In order to ensure that the total amount ...

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PUM

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Abstract

The invention discloses a pre-inflatable pneumatic reversing valve which comprises a valve body, a valve plug, a piston, a first valve bank, a second valve bank, a photoelectric dispatching device and a baffle plate, wherein the piston is fixedly integrated with the valve plug; the first valve bank and the second valve bank are formed by a first valve cover respectively with a first valve seat and a second valve seat; and baffle plate is matched with the photoelectric dispatching device and is fixedly integrated with the valve plug. The pre-inflatable pneumatic reversing valve is characterized in that the right side of the second valve bank is added with a third valve bank which is composed by a third valve seat and a fixed valve cover; the first valve cover is a movable valve cover; the left side of the movable valve cover is connected with a fixed block through a spring which is sleeved on the valve plug; and the valve plug at the right side of the movable valve cover is fixedly provided with a retainer ring. The invention has the beneficial effects that when a critical flow meter is detected with a PVTt (pressure, volume, temperature, time) method gas flow calibration facility by the pre-inflatable pneumatic reversing valve provided by the invention, the introduced unstable state and possible generated additional error in the flow rate building process when in the detection at the beginning are reduced.

Description

technical field [0001] The invention relates to a pre-inflated pneumatic reversing valve, which belongs to the technical field of valves. Background technique [0002] The PVTt method gas flow standard device is a high-precision standard device for measuring gas mass flow rate. Its main purpose is to verify the outflow coefficient of the critical flow meter (that is, the sonic nozzle that people often say). The PVTt method gas flow standard device is in use A three-way reversing valve is needed between the verified sonic nozzle and the verification container, but the three-way reversing valve used in the prior art only performs a simple flow path switching. At the beginning of switching, the nozzle throat has not yet established the rated verification flow, which will cause a verification error. Contents of the invention [0003] The purpose of the present invention is to ensure that when the critical flow nozzle enters the verification state, the throat of the critical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K11/044F16K31/122F16K37/00G01F25/00
Inventor 李传经岳坚
Owner SHANGHAI INST OF PROCESS AUTOMATION & INSTR