GEGOSSENER HALBMASKENKLAPPENAUFBAU.

摘要

PCT No. PCT/CA90/00216 Sec. 371 Date Dec. 20, 1991 Sec. 102(e) Date Dec. 20, 1991 PCT Filed Jul. 11, 1990 PCT Pub. No. WO91/01159 PCT Pub. Date Feb. 7, 1991.In a gas mask, a flexible nosecup is used to prevent humid air that is exhaled from contacting the eye pieces of the mask. The nosecup is equipped with a one-way valve to allow fresh air into the nosecup. The conventional rigid valve body attached to the nosecup is replaced with a valve body molded integrally with the material of the nosecup and a valving element with a concave disk, having its rim seated on the annular valve seat of the valve body. The concave valving element accommodates any flexing of the valve body without losing the seal.