... production, including large-scale housing casting, conductor, precise valve, pipe fitting, shielding case and machining products. We ... small-scale combination valve, automatic compensation for plunger shut-off valve, self sealing valve and double-headed valve. Our products have ... ,500m/s2 11ms Operating life,5000 times Material & connection Valve body,LY12-CZValve core,HPb59-1Spring,3J9Sealing,EPDM(E ...