Schley T679 Pressure Regulating Valve

> Compact Construction Type
> High Control Accuracy

Product Description

Schley T679 Pressure Regulating Valve

For industrial, chemical, steam, and oil & gas applications.

Connections: From DN15 to DN200 (1/2″ to 8″)

Outlet Pressures: From 0.5 to 40.0 bar


Materials available:
  • Ductile cast iron 0.7040
  • Cast steel 1.0619
  • Stainless steel 1.4408
  • Bronze CC480K (GbZ10)
  • Aluminum bronze CC333G
  • Super Duplex 1.4469



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Technical Information

Technical Information for T679

  • Valve Sizes
    DN15 (1 /2”) to DN65 (2 1/2”)
  • Pressure Rating
    PN16 - PN40 / CL 150 - CL300, 10K - 30K
  • Flange according to
  • Materials
    EN-JS1030 | 1.0619+N / WCB | 1.4408 I CF8M | 1.4469 / Super Duplex to +200°C
  • Temperature range
    -45°C to +450°C
  • Modular construction system
    (same construction parts for gas and liquids)
  • With inside pulse line
  • Outlet pressure
    0,5 to 20 bar, lower and higher pressures available on request
  • Sealing
    Cone metallic sealing with stainless steel bellow 1.4571
  • Suitable for compressible and incompressible media
  • Max. reduction ratio


  • Compact construction type
  • Easy fit to the respective use because of the big variety of options
  • The same construction parts for gas, liquids, and steam for an easier
    maintenance and repair
  • Inside spring (protected by bonnet)
  • Pulse line built at the valve, no installation of an external line
  • Simple and robust construction type for high reliability and easy
  • Lower total operational cost due to the optimised construction
  • Safe against pressure surges (stainless steel bellow)
  • High control accuracy
  • Constant control of the outlet pressure irrespective of inlet pressure
  • The valve locks up securely due to low low-pressure increase


Silent Guardians of Pressure

Don’t let high pressure become a high-pressure situation. Pressure-reducing valves stand guard, discreetly regulating fluid flow and ensuring it stays within safe and optimal ranges


View or Download the Type T679 Datasheet

Full Technical Information - Including Flow Rates

View or Download the Type T679 Datasheet

The function of overflow valves (relief valves, pressure retaining valves) is, to the outflow of the medium at a set pressure, in which an existing back pressure or vacuum does not affect the set overpressure (retaining pressure). The above-listed items are characteristic of an upstream pressure regulator, by comparison to a normal safety valve. The safety valve is only a device to prevent a specific pressure from being exceeded (set pressure).


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