We are Manufacturer, Supplier, Exporter of Tight Shut Off Valves, Tight Shut Off Dampers from Pimpri Chinchwad PCMC near Pune, Maharashtra, India.
The tightness level required during the isolation activity depends on the fluid to be isolated. Isolation for hazardous fluid like H2S, HCl, and sulphuric acid has a direct impact on human beings, isolation of flammable services has consideration for fire whereas the isolation of utility services like air or water only has a potential impact in terms of fluid loss and hence the acceptable leakage rate levels will vary. Often when commissioning or troubleshooting automatic control valves, there’s a discovery that the control valve, even though fully closed, doesn’t fully shut off the flow of process fluid through the plug and seat. Although closed, there is an “allowable leakage rate” as part of each control valve’s specification. Industry standards have been established for the control valve’s regarding the amount of permissible leakage of the process fluid through the valve’s seat.
Shutoff classifications are determined by a percentage of a test fluid (usually water or air) that passes through the valve, as part of valve rated capacity. Shutoff classifications range from ANSI Class I, where the valve does not require tight shutoff, to ANSI Class VI, where shutoff must be completely or nearly bubble tight. The following briefly describes each shutoff classification and maximum leakage rates for each.
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