... leak amount 3.wide working temperature range Wide-type wind valve Product namewide-type air valves (wide type of wind valve)Model ZY- ... noise,3. small leak amount (airtight-type leak amount <0.5%),4.wide working temperature range,5.reliable structure, safety and ... noise,3. small leak amount (airtight-type leak amount <0.5%),4.wide working temperature range,5.reliable structure, safety and ...