How should one choose between flow-on and flow-off operation for valves?

2017-05-20View Original

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How should one choose between flow-on and flow-off operation for valves?

Reply #22017-05-20

Flow-opening type: When the fluid flows past the valve core, the resulting thrust helps to open the valve; such a valve core is considered flow-opening. Flow-closing type: When fluid flows through the valve core, the resulting thrust helps to close the valve; such a valve core is considered flow-closing

Reply #32017-05-20

Flow-opening type: When the fluid flows past the valve core, the resulting thrust helps to open the valve; such a valve core is considered flow-opening. Flow-closing type: When fluid flows through the valve core, the resulting thrust helps to close the valve; such a valve core is considered flow-closing

Reply #42017-05-20

I currently have an eccentric rotary valve; the FTC value was provided by the design institute, while the FTO value was given by the valve manufacturer, and I’m not sure how to make a choice

Reply #52017-05-20

Flow-opening type: When the fluid flows past the valve core, the resulting thrust helps to open the valve; such a valve core is considered flow-opening. Flow-closing type: When fluid flows through the valve core, the resulting thrust helps to close the valve; such a valve core is considered flow-closing.

Reply #62017-05-21

Generally speaking, if the design institute specifies the open/closed flow pattern, it has been carefully considered, and this should be taken as the standard. Manufacturers sometimes overlook this issue, so it needs to be confirmed.

Reply #72017-05-21

How to determine flow-on and flow-off for angular stroke?

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