Exhaust valve having a constant bleed rate

摘要

Disclosed is an exhaust valve having an approximately constant rate of pressure loss per unit time which is particularly useful with an automatic sphygmomanometer. A pair of abutting plates are provided in a fluid flow path. The plates are pressurized into contact with each other at least in part by a pressurized fluid to be exhausted through the valve. At least one of the plates is formed of a resilient material and a gap-forming member is disposed between the abutting plates to define an exhaust passage which has a cross section which varies as the pressure of the pressurized fluid varies.