Is the J41 type globe valve suitable as a bypass for automatic control valves?
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This post was last edited by DustUndecided on 2022-10-27 at 17:47. For the oil outlet of the two-phase separator in a certain project, a J41Y-100 globe valve (DN100) is used as a bypass for the pneumatic control valve assembly; this valve is installed on a vertical pipe. In the initial stage of operation, the oil flow at the separator outlet is adjusted using the J41Y-100 shut-off valve. The operating pressure is around 8 MPa before the valve, and around 4 MPa after the valve. About 4 hours after operation began, vibration occurred in the stop valve, and the valve disc gradually closed. A preliminary disassembly of the stop valve was carried out afterward, and it was found that the movement clearance of the valve disc was quite large. 2094 Request for help: 1. We have installed many projects in this way before, and such problems have never occurred; we don’t know why this is happening now 2. How do colleagues generally choose the bypass valves for control valve assemblies?
Is it possible that there is a problem with the quality of this stop valve? Try installing another one and see
The specifications allow for installation in any position
Why is bypass regulation used in normal production? Isn’t a bypass used only in special situations?
In the initial stage of operation, use a control valve to regulate the flow; once stability is achieved, activate the pneumatic control valve.
This post was last edited by Xingwei Valves on 2022-11-1 08:55. Just switch to another one.
Firstly, it is evident from your side as well that the processing precision of the other party’s products is insufficient, which leads to excessive gaps. Secondly, high-pressure stop valves require guide grooves to be machined in order to prevent displacement of the valve stem and valve disc, thereby avoiding seal failure. Based on what you’ve described, the other party’s products also lack such guide grooves; whether this is because they weren’t specified in the design drawings or to save on manufacturing costs, manufacturers like this are not worth partnering with.
A throttle valve should be used. Also, is the valve port diameter too large? It may be necessary to add an orifice plate