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Pressure control valves
Surge relief valves SAV 820E
Surge anticipation valve

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Technical Data

Connection DN 40 - 150
Nominal pressure PN up to 160
Set pressure 10 - 70 bar
Outlet pressure Relief line, unpressurized
Kvs value 20 - 250 m³/h
Temperature -30 up to 130 °C
Medium liquids

Description

Surge relief valves are used for the decay of pressure surges and of
permanent overpressures within pipeline systems.
Designed for installation in a bypass line, the SAV820E prevents harmful
pressure surges that can develop in pumping systems during sudden
pump stoppage. Unlike conventional pressure relief valves that open
only when a high-pressure surge is encountered, the SAV820E already
senses the preliminary stage of the high-pressure surge (pump failure or
low-pressure surge) and opens in anticipation of the subsequently
returning high-pressure surge. By pre-opening, the SAV820E inhibits the
pressure rise before it occurs.
The SAV820E is a self-acting valve with two adjustable* response
pressures and adjustable closing behavior. It consists of the main valve
with two adjustable pilot valves and a throttle valve. It operates without
auxiliary or external energy.
When the upper or lower response pressure is reached, the valve opens.
At a pressure between the response pressures, the valve remains closed.
These valves are no shut-off elements ensuring a tight closing of the
valve. In accordance with DIN EN 60534-4 and/or ANSI FCI 70-2 they
may feature a leakage rate in closed position in compliance with the
leakage classes III or V, optional IV.

Standard

» Completely made of stainless steel
» ANSI or EN flanges
» Transport lugs
» Manometer

Options

» Special material such as Duplex steel
» Different materials for O-rings and gaskets, suitable for your medium
» Special connections
» Filter in the sense line
» Customized special versions on request, such as
- straightway valve
- control by solenoid valve
- diaphragm-operated
- dome-loaded

Operating instructions and safety instructions must be observed. All the
pressure has always been indicated as overpressure. We reserve the right
to alter technical specifications without notice.

Schematic layout