TEMPERATURE COMPENSATING FLANGED JOINT FOR A TEFLON DIAPHRAGM VALVE.

摘要

A diaphragm valve (10) includes a valve body (12) having a circumferential flange; a diaphragm (16) having a circumferential gasket portion (16a) configured to be seated on the circumferential flange so as to form a joint between the valve body and the diaphragm; a pressure ring (18) having concentric fluctuations (18b) to apply a sealing force against the joint so that the concentric fluctuations prevent radial movement of the circumferential gasket portion and the circumferential flange; and an elastomeric member (20) that responds to a compressive force and provides a substantially constant sealing force, transmitted through the pressure ring, regardless of small variations in the thickness or material dimensions of the circumferential gasket portion caused by temperature fluctuation or material flow and age.