Abstract: A novel and improved hydraulic check valve assembly comprised of an arrangement of coaxially interfitted, generally cylindrical elements that are clamped between a pair of coaxial end flanges and wherein valve opening and closing occurs by movement of independently movable and coaxially interfitted inlet and outlet seat members in response to the impetus of fluid flow encountered in the valve, the movement of at least one of the inlet and outlet seat members being cushioned by in a hydraulic fluid cushion to dissipate impact forces and consequent valve wear associated with sudden flow direction reversals.

Abstract: A hot and cold water pressure regulating mixing faucet with automatic hot water shut-off in the event of cold water failure. The faucet maintains a predetermined discharge pressure less than the supply pressure regardless of the amount of water issuing from the faucet in combination with parts in a flat face slide valve surface to regulate the amount of water issuing from the faucet or the proportionate mixture of different or hot and cold water, and in combination with a concentric rotary proportioning selector valve having an axial bore containing the pressure regulator valve operable axially within the bore of the rotary selector valve. The pressure regulator valve is operable to completely shut off the hot water in the event of cold water failure. The slide valve and the rotary proportioning valve and the pressure regulating valve are coaxially concentric to each other cooperating in performing their valvular function upon the water entering the housing and discharging axially.