Pressure Reducing Valve

The Model 90-44 is a pressure reducing valve with an orifice plate or venturi tube downstream of the valve. The venturi, or orifice plate, is used to create a pressure drop, which lowers the sensed pressure to the pilot as the system demand increases. The result of lowering the pilot sensed pressure is to automatically increase the pressure immediately downstream of the orifice plate, which compensates for system loss. The pilot system will likewise automatically provide a lower pressure downstream of the orifice plate as the flow rate decreases. While the pressure immediately downstream of the orifice plate varies with flow, the system pressure at the critical point remains more constant. An orifice plate is the most economical device for creating the required pressure drop. However, a venturi should be considered when pressure recovery is the primary factor. Pressure recovery is much better downstream of a venturi tube than downstream of an orifice plate. This model is simple to maintain and operate. It requires no power.

Cla-Val, 1701 Placentia Avenue, P.O. Box 1325, Costa Mesa, CA 92659-0325. Tel: 949-722-4800; Fax: 949-548-5441.