Non-leak valve of plastic construction

摘要: A valve of plastic construction, adapted for manual or automatic operation comprises, in combination, A. MOLDED PLASTIC CHAMBER INCLUDING BODY AND CAP REMOVABLY CARRIED THEREBY, THERE BEING AN ANNULAR MAIN SEAT IN THE OUTLET FROM BODY, B. STEM PROJECTING GENERALLY COAXIALLY THROUGH WITH CLEARANCE THEREFROM, TOWARD AT ONE SIDE OF SEAT, C. STOPPER BY TO ENGAGE DISENGAGE OPPOSITE THEREOF RESPONSE AXIAL BODILY DISPLACEMENT STEM, D. STRUCTURE CARRYING EFFECT SAID THEREOF, E. HAVING LIQUID PRESSURE INLET COMMUNICATE FOR TRANSMITTING LOADING WHEN IS DISPLACED CONSEQUENT ENGAGEMENT AGAINST SEAT,WHEREBY WILL REMAIN CLOSED IRRESPECTIVE OR TEMPERATURE CHANGE INDUCED EXPANSION CONTRACTION HOUSING.