PM-HF

The PROTEGO® Type PM-HF pilot-controlled diaphragm Membrane A diaphragm is a thin layer of material, which has a large surface area. valve is a highly developed valve for pressure and vacuum Dépression Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. relief. Primarily used as a device Appareil A device is a pipe component that influences the media flow by opening, closing, or partially shutting off the flow channel or by dividing or mixing the media flow. for outbreathing in tanks, vessels, and process engineering equipment it also offers reliable protection from vacuum and overpressure Surpression Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. . It prevents intake of air and unacceptable product vapor loss up to and until the set-to-operate pressure is reached. The valve can be used as an inbreathing device as well. In such an application, the main valve is directly controlled when exposed to a vacuum, i.e. it functions as a weight-loaded diaphragm valve.

As the working pressure rises, the closing force acting on the main valve increases, i.e. the valve's tight-sealing is enhanced until the set-to-operate pressure is reached, thus preventing leakage. Once the valve has commenced to lift Course Lift is the actual travel of the valve pallet from the main valve out of the closed position. it opens fully within a 10% pressure rise or the opening pressure difference and the nominal volumetric fl ow is discharged through a fully open valve. If and when this level is exceeded the pressure increase will follow the performance curve (Δp/V.curve). From set pressure Pression de réponse Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions. to full capacity (fully open valve) the pressure increase is 100% in case of vacuum venting/inbreathing function.