PM-HF

PM-HF

Pressure/Vacuum Relief Valve Pilot-operated diaphragm valve

Função e descrição

The PROTEGO® Type PM-HF pilot-controlled diaphragm valve is a highly developed valve for pressure and vacuum relief. Primarily used as a safety device for outbreathing in tanks, vessels, and process engineering equipment it also offers reliable protection from vacuum and overpressure. 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 valveis directly controlled when exposed to a vacuum, i.e. it functions as a weight-loaded diaphragm valve.

The main valve is controlled by a pilot valve. The latter in turn is controlled by the tank pressure. 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.

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 it opens fully within a 10% pressure rise or the opening pressure difference and the nominal volumetric flow 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 to full capacity (fully open valve) the pressure increase is 100% in case of vacuum venting/inbreathing function.

Due to the sophisticated manufacturing technology, the tank pressure is maintained up to the set-to-operate pressure, with seal-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.

Características especiais e vantagens

  • controlled by corrosion-resistant pilot valve
  • small amount fluid stored in the tank released into the atmosphere by the pilot when the valve opens
  • max. 10% Technology for minimum pressure increase until full lift
  • seals extremely tight; hence, least possible product losses and reduced impact on the environment
  • set-to-operate pressure close to the opening pressure; hence, best possible pressure management of the System.
  • control diaphragm of the main valve shielded from low temperatures - Long service life
  • high flow capacity
  • suited for use in hazardous areas
  • Field-Test-Connection on request
  • Field-Test-Kit on request

 

Tabela de dimensões

Para escolher o diâmetro nominal (DN), veja os diagramas de vazão nas páginas seguintes

DN180 / 3" 100 / 4" 150 / 6" 200 / 8" 250 / 10"300 / 12" 300 / 12"
DN2100 / 4"150 / 6"200 / 8"250 / 10"300 / 12"350 / 14"400 / 16"
a225250325375450500500
b150175225250270300300
c275330445550665785785
d370425515590675785785
e763833923977103211481198
f35404050505050
DN180 / 3" 100 / 4" 150 / 6" 200 / 8" 250 / 10"300 / 12" 300 / 12"
DN2100 / 4"150 / 6"200 / 8"250 / 10"300 / 12"350 / 14"400 / 16"
a225250325375450500500
b150175225250270300300
c275330445550665785785
d370425515590675785785
e763833923977103211481198
f35404050505050

Dimensões em mm

PM-HF

Seleção do material do corpo

Execução A B
Corpo Alumínio Aço inoxidável
Sedes de válvulas Aço inoxidável Aço inoxidável
VedaçãoKL-C-4106KL-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 pilotoFEPFEP
Execução A B
Corpo Alumínio Aço inoxidável
Sedes de válvulas Aço inoxidável Aço inoxidável
VedaçãoKL-C-4106KL-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 pilotoFEPFEP

Materiais especiais sob solicitação

PM-HF

Coefficient of Discharge

DN180 / 3"100 / 4"150 / 6"200 / 8"250 / 10"300 / 12"300 / 12"
DN2100 / 4"150 / 6"200 / 8"250 / 10"300 / 12"350 / 14"400 / 16"
do81107160208260310310
K0,680,680,630,590,580,540,61
DN180 / 3"100 / 4"150 / 6"200 / 8"250 / 10"300 / 12"300 / 12"
DN2100 / 4"150 / 6"200 / 8"250 / 10"300 / 12"350 / 14"400 / 16"
do81107160208260310310
K0,680,680,630,590,580,540,61

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; 150 lbs RFSF
EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF

Outras conexões sob solicitação

Versão e especificação

Following designs are available:
Basic design of pressure/vacuum relief valve with a control pilot valve

PM-HF

Basic design of pressure/vacuum relief valve with a control pilot valve

PM-HF

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 (DN100/4" - DN 300/12")
-0.88 inch W.C. -2.8 inch W.C.
Ajustes de pressão mais altos ou baixos sob solicitação.
PM-HF

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.

PM-HF
PM-HF