The Crosby Style PVR pressure/vacuum relief valve is a sanitary valve designed specifically for the brewing, beverage, food processing and pharmaceutical industries. This valve provides overpressure protection in three modes of self-actuated operation:

1. Relieves excess air or gas pressure;
2. Relieves excess liquid pressure in the absence of air or gas blanketing; and
3. Designed to prevent formation of a vacuum that could cause the vessel to buckle.

The pressure/vacuum relief valve is manufactured in accordance with ASME Code Section VIII requirements. Valve capacities on compressible fluid are certified by the National Board of Boiler and Pressure Vessel Inspectors. The valve body and all internal parts are designed to operate after exposure to process fluids and to withstand direct flushing and cleansing of sterilizing agents, caustics, water or steam.

Further, the configuration of each valve piece permits complete drainage after valve operation and/or flushing, and minimizes crevices which might trap contaminants or promote freezing in cold environments.
Crosby’s PVR is a versatile design featuring reliable and trouble-free operation. The valve set pressure may be adjusted by the stainless steel adjusting bolt which is also the pressure relief disc guide. The pressure relief disc in turn guides the vacuum disc and spring. Vacuum relief set pressure is pre-set at the factory and is non-adjustable. The cap is sealed with a lead seal to prevent tampering. Tight shut-off is provided by standard Viton® O-ring seats on both discs. All valve materials are corrosion resistant and all exposed surface finishes are controlled to enhance the sanitary features of the valve.

If your process requires a custom designed pressure relief, vacuum relief, or pressure/vacuum relief valve manufactured to ASME standards, contact your sales representative.