Medium Temperature of Instrument Valves: Oil: -30～80℃; Air: -30～50℃; Water: Below 80℃. JB/ZQ4427～4428-1986. The three-leaf rubber hose fittings do not require the outer rubber layer to be peeled off during assembly. Different types of instrument pipe fittings have hoses with slightly different outer diameters, which are secured by the fitting's outer sleeve. Requirements for valve fluid characteristics: flow resistance, discharge capacity, flow characteristics, sealing grade, etc. Installation and dimensional requirements: nominal diameter, connection method and size with the pipeline, external dimensions or weight limits, etc. Additional requirements for valve product reliability, service life, and explosion-proof performance of the electric actuator.

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