PM-HF
Pressure/Vacuum Relief Valve Pilot-operated diaphragm valve
Características
Função e descrição
Combined Pressure and Vacuum Relief Valve
The PROTEGO® Type PM-HF pilot-controlled diaphragm Diaphragm A diaphragm is a thin layer of material, which has a large surface area. valve is a highly developed valve for pressure Pressure (gauge pressure) Pressure for which the value is equal to the algebraic difference between the absolute pressure and the atmospheric pressure. and vacuum Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. relief. Primarily used as a device Device 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 Equipment Machines, appliances, fixed or mobile devices, control parts and accessories, and warning and prevention systems, whether separate or combined, intended for the generation, transfer, storage, measurement, control, and conversion of energy, and for the processing of materials, which have their own potential source of ignition and may cause an explosion. it also offers reliable protection from vacuum and overpressure Overpressure 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 Product Includes equipment, protective systems, devices, components and combinations of these. 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 Pilot valve 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 Tank pressure 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 Spring 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 Lift 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 Set pressure 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 Seal 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.
Tabela de dimensões
Para escolher o diâmetro nominal (DN), veja os diagramas de vazão nas páginas seguintes
| 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 |
Dimensões em mm
Seleção do material do corpo
| Execução | A | B |
| Corpo | Alumínio | Aço inoxidável |
| Sedes de válvulas | Aço inoxidável | Aço inoxidável |
| Vedação | KL-C-4106 | KL-C-4106 |
| Proteção do diafragma principal | Aço inoxidável | Aço inoxidável |
| Tubos de comando | Aço inoxidável | Aço inoxidável |
| Corpo da unidade piloto | Alumínio | Alumínio / Aço inoxidável |
| Diafragma piloto | FEP | FEP |
Materiais especiais sob solicitação
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 | 107 | 160 | 208 | 260 | 310 | 310 |
| 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 conexão flangeada
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
Outras conexões sob solicitação
Versão e especificação
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
Ajustes de pressão
| Pressão: | +10 mbar | +1034 mbar |
| +4 inch W.C. | +413.6 inch W.C. | |
| Vácuo: | -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. |
Ajustes de pressão mais altos ou baixos sob solicitação.
Diagrama de vazão
Este diagrama de vazão foi determinado em uma bancada de medição de vazão calibrada e certificada pela TÜV. A vazão V em m³/h se refere ao estado técnico padrão de ar, conforme ISO 6358 (20°C, 1bar). Para conversão em outras densidades e temperaturas, veja o cap. 1: Bases técnicas.
