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&lt;p&gt;Specified leakage test is carried out % on each insert/valve IEC specifies the requirements for the inspection and routine testing of control valves manufactured in conformity with the other parts of IEC This document is applicable to valves with pressure ratings not exceeding Class The requirements for actuators apply only to pneumatic actuators Selection of a leakage class is not restricted as to valve design, but acceptable values for various commercially available designs are suggested for each class under SectionThe standard cannot be used as a basis for predicting leakage at conditions other than those specifiedThis standard is similar to IEC, except It is an Selection of a leakage class is not restricted as to valve design, but acceptable values for various commercially available designs are suggested for each class under SectionThe   · This part of IEC specifies the requirements for the inspection and routine testing of control valves manufactured in conformity with the other parts of IEC This  IEC specifies the requirements for the inspection and routine testing of control valves manufactured in conformity with the other parts of IEC This document is There are actually six different seat leakage classifications defined by ANSI/FCI(European equivalent standard IEC). CLASS IV. CLASS Vl. CLASS IV is also known as metal to metal. It is an The data used is taken from the International standard IEC Sections of the standard are high-lighted in this document, making it possible to calculate the maximum leakage according to the standardGeneral. The most commonly used are. It is the kind of leakage rate you can expect from a valve with a metal plug and a metal seat IEChas been prepared by subcommitteeB: Measurement and control devices, of IEC technical committee Industrial -process measurement, control and automation. The most commonly used are. There are actually six different seat leakage classifications defined by ANSI/FCI(European equivalent standard IEC). CLASS IV IEC has been prepared by subcommittee: Measurement and control devices65B, of IEC technical committee Industrial -process measurement, control and automation.&lt;/p&gt;</property:Description>
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