Stand-alone control valve Pressure reducing valve
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This post was last edited by 2005180005 on 2017-12-18 at 15:52. Does an independent control valve require a valve assembly (including a bypass)? As shown in the figure, some people say that self-acting control valves do not break down and do not require a bypass; it is sufficient to install a shut-off valve behind the self-acting control valve. Is it necessary to install an on-site pressure gauge as well behind the self-acting control valve? What are the differences in the application scenarios of stand-alone control valves and pressure reducing valves? The pipeline in the diagram is used for nitrogen purging; is it appropriate to have an “FC” valve installed after the stand-alone control valve?
Does a stand-alone control valve require a valve bank (including a bypass)? As shown in the figure, Reply: Yes, the bypass route is used for temporary gas supply during maintenance in case of a regulator failure ； Is it necessary to install an on-site pressure gauge after a stand-alone control valve? Reply: On-site pressure gauges and exhaust valves are required for the static testing of the pressure regulator ； What are the differences in the application scenarios of stand-alone control valves and pressure reducing valves? Reply: Self-acting pressure regulation is suitable for applications with significant fluctuations in inlet and outlet flow and pressure; it features fast response times and is simple and reliable ； The pipeline in the diagram is used for nitrogen purging; is it appropriate to have an “FC” valve installed after the stand-alone control valve? That makes sense too ；
Does a stand-alone control valve require a valve bank (including a bypass)? As shown in the figure, Reply: Yes, the bypass route is used for temporary gas supply during maintenance in case of a regulator failure ； Is it necessary to install an on-site pressure gauge after a stand-alone control valve? Reply: On-site pressure gauges and exhaust valves are required for the static testing of the pressure regulator ； What are the differences in the application scenarios of stand-alone control valves and pressure reducing valves? Reply: Self-acting pressure regulation is suitable for applications with significant fluctuations in inlet and outlet flow and pressure; it features fast response times and is simple and reliable ； The pipeline in the diagram is used for nitrogen purging; is it appropriate to have an “FC” valve installed after the stand-alone control valve? That makes sense too ；
What is purging? What does purging entail? Is it for starting and stopping? Then a control valve should not be necessary.
Purging of acetylene: the purge gas is sent to the flare, and pressure requirements apply
Does a stand-alone control valve require a valve bank (including a bypass)? Reply: Any valve is prone to malfunctions; it is not recommended. If the pressure difference is too large, the activation of the bypass can pose safety risks. Compared to other valves, it is recommended to install a 100-mesh filter to protect the pressure reducing valve and control valve. Is it necessary to install an on-site pressure gauge after a stand-alone control valve? Reply: An on-site pressure gauge is needed to display the value locally, which facilitates debugging and fault diagnosis ； What are the differences in the application scenarios of stand-alone control valves and pressure reducing valves? Reply: Compared to pneumatic pressure reducing valves, self-acting regulators have relatively lower pressure regulation accuracy, but they are simpler ； The pipeline in the diagram is used for nitrogen purging; is it appropriate to have an “FC” valve installed after the stand-alone control valve? If the regulating valve is placed too close to the pressure reducing valve, the lag characteristic of the self-acting pressure reducing valve can cause the pressure downstream of the valve to rise sharply; it is recommended to install a safety valve in such cases.
Does a stand-alone control valve require a valve bank (including a bypass)? Reply: Any valve is prone to malfunctions; it is not recommended. If the pressure difference is too large, the activation of the bypass can pose safety risks. Compared to other valves, it is recommended to install a 100-mesh filter to protect the pressure reducing valve and control valve. Is it necessary to install an on-site pressure gauge after a stand-alone control valve? Reply: An on-site pressure gauge is needed to display the value locally, which facilitates debugging and fault diagnosis ； What are the differences in the application scenarios of stand-alone control valves and pressure reducing valves? Reply: Compared to pneumatic pressure reducing valves, self-acting regulators have relatively lower pressure regulation accuracy, but they are simpler ； The pipeline in the diagram is used for nitrogen purging; is it appropriate to have an “FC” valve installed after the stand-alone control valve? If the regulating valve is placed too close to the pressure reducing valve, the lag characteristic of the self-acting pressure reducing valve can cause the pressure downstream of the valve to rise sharply; it is recommended to install a safety valve in such cases.
This post was last edited by 2005180005 on 2017-12-25 at 18:41: “Compared to other valves, it is recommended to install a 100-mesh filter to protect the pressure reducing valve and control valve. ”Install a filter? Why? \"If the regulating valve is too close to the pressure reducing valve, the lag inherent in self-acting pressure reducing valves can cause the pressure behind the valve to soar; it is therefore recommended to install a safety valve.\" ” Is a control valve needed after the pressure reducing valve? Why?
What is an exhaust valve? If it is used for nitrogen purging, and the valve closes once the set pressure downstream of it is reached after the stand-alone control valve is activated, then how can purging take place?