PM-HF
Pressure/Vacuum Relief Valve Pilot-operated diaphragm valve
Características
Función y descripción
Combined Pressure and Vacuum Relief Valve
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.
Tank Pressure Controls the Pilot Valve
The main valve is controlled by a pilot valve Soupape pilote The pilot valve is an assembly of a pilot operated valve, which is mounted on the main valve and is used to control the main valve. . The latter in turn is controlled by the tank pressure Pression de la cuve Tank pressure is the pressure within a tank. . A small amount fluid stored in the tank released into the atmosphere by the pilot when the valve opens. The set-to-operate pressure is adjusted on the pilot valve by increasing or decreasing (as appropriate) the tension of a spring Ressort A spring is a spiral of wire which returns to its original shape after it is pressed or pulled. .
Extreme Tightness
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.
Advanced Manufacturing Technology
Due to the sophisticated manufacturing technology, the tank pressure is maintained up to the set-to-operate pressure, with seal Joint A seal prevents or limits unwanted transfer of product from one container to another. Seal is used as superordinate term for all types of sealing elements. -tight requirements far above common standards being met. This feature is achieved through valve seats made of high-grade stainless steel with precisely ground valve pallets. Once the excess pressure is relieved or pressure below atmospheric balanced out, the valve reseats and seals tight again.
Dimensiones
To select the nominal size Diamètre nominal The nominal size is an alphanumeric designation of size for components in a piping system, used for reference purposes, comprising the letters DN followed by a dimensionless integer that is indirectly related to the physical size of the bore or outside diameter of the connections, expessed in millimeters. (DN), use the flow capacity charts on the following pages
| DN1 | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" | 300 / 12" |
| DN2 | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" | 350 / 14" | 400 / 16" |
| a | 225 / 8.86 | 250 / 9.87 | 325 / 12.80 | 375 / 14.76 | 450 / 17.72 | 500 / 19.69 | 500 / 19.69 |
| b | 150 / 5.91 | 175 / 6.89 | 225 / 8.86 | 250 / 9.84 | 270 / 10.63 | 300 / 12.81 | 325 / 12.80 |
| c | 275 / 10.83 | 330 / 12.99 | 445 / 17.52 | 550 / 21.65 | 665 / 26.18 | 785 / 30.91 | 785 / 30.91 |
| d | 376 / 14.80 | 429 / 16.89 | 536 / 21.10 | 607 / 23.90 | 678 / 26.69 | 796 / 31.34 | 846 / 33.31 |
| e | 763 / 30.04 | 770 / 30.31 | 923 / 36.34 | 977 / 38.46 | 1052 / 41.42 | 1173 / 46.18 | 1223 / 48.15 |
| f | 35 / 1.38 | 40 / 1.57 | 40 / 1.57 | 50 / 1.97 | 50 / 1.97 | 50 / 1.97 | 50 / 1.97 |
Dimensiones en mm / pulgadas
Selección de materiales para la vivienda
| Design | A | B |
| Housing | Aluminium | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel |
| Sealing | KL-C-4106 | KL-C-4106 |
| Main diaphragm protection | Stainless Steel | Stainless Steel |
| Pilot lines | Stainless Steel | Stainless Steel |
| Pilot housing Corps A housing is a solid shell, which surrounds a content, either protecting the content from external influences, or protecting the environment from the content. | Aluminium | Aluminium / Stainless Steel |
| Pilot diaphragm | FEP | FEP |
Special materials upon request
Coefficient of Discharge
| DN1 | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" | 300 / 12" |
| DN2 | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" | 350 / 14" | 400 / 16" |
| do | 81 / 3.19 | 107 / 4.21 | 160 / 6.30 | 208 / 8.19 | 260 / 10.24 | 310 / 12.20 | 310 / 12.20 |
| K | 0,68 | 0,68 | 0,63 | 0,59 | 0,58 | 0,54 | 0,61 |
DN1 = Size Inlet
DN2 = Size Outlet
d0 = Orifice Diameter (mm / inches)
K = Coefficient of Discharge
Tipo de bridas de conexión
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Modelo y especificación
Following designs are available:Additional special devices available upon request
*It is recommended thet an external control line be provided with direct connection to the tank
Settings
| Pressure: | +10 mbar | +1034 mbar |
| +4 inch W.C. | +413.6 inch W.C. | |
| Vacuum: | -3.0 mbar | -7 mbar |
| -1.2 inch W.C. | -2.8 inch W.C. | |
| -2.2 mbar | -7 mbar | |
| -0.88 inch W.C. | -2.8 inch W.C. |
Higher or lower settings upon request.
Diagrama de flujo volumétrico
Los diagramas de flujo volumétrico han sido determinados con un banco de pruebas de caudal calibrado y certifi - cado por TÜV. El flujo volumétrico V. en [m³/h] y el CFH se refi eren a las condiciones estándar de referencia de aire según ISO 6358 (20°C, 1bar). La conversión a otras densidades y temperaturas están referidas en el Vol. 1: “Fundamentos Técnicos”.
