Schroeder – SDV Back Pressure DeviceEnquire Now

Schroeder 8211 SDV Back Pressure DeviceSchroeder 8211 SDV Back Pressure Device

BRAND: SchroederCATEGORY: Pump Protection Valves

The Schroeder SDV back pressure device does not allow the static pressure in the upstream pipe to fall below a defined minimum value. It does this independently of the flow volume. This means that the specified minimum pressure is maintained, from the nominal flow rate to the smallest volume. Normally back pressure devices are used to avoid cavitation and partial evaporation in the pumping medium. By increasing the pressure level in the system component to be protected, they stop local steam pressure from falling below requirements. The SDV has an integrated return function, i.e. the system is also protected against reverse flow if needed. The active principle of the SDV is based on a spring-loaded locking cone. The cone and spring are coordinated in such a way that once the specified holding pressure has been reached, the pressure force is sufficient to lift the cone out of its seat, thus permitting flow. Unlike conventional back pressure devices / counter-pressure regulators, the cone of our back pressure device has been equipped with a control profile. This allows the throttle surface at the cone seat to accurately adapt to the relevant flow rate, thereby minimizing the unfortunate tendency of spring-loaded locking devices to produce knocking or hammering noises at low flow rates. The SDV is therefore suitable for systems with a wide operating range and frequent partial load operation.

Specifications

SeriesSDV
Design

Back Pressure Device

Features
  • Back pressure control
  • Integrated non return valve
Size
Range

25mm to 200mm / 1” to 8”

Pressure
Rating

Up to PN 400 / Up to ANSI 2500

TemperaturesUp to 400°C
End
Connections
Flanged
Body
Materials

Carbon steel / Stainless SteelOther materials on request

Seat
Materials
Forged stainless steel / Hardfaced / Stellited
Applications

Keeps the static pressure within a pipeline above a defined minimum value to avoid cavitation and partial evaporation.

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