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Pressure Control Valves
Pressure Reducing Valves VRCD (DM 644)
Epoxy-coated Cast Valve

Technical Data

Connection DN 50 - 150
Nominal Pressure PN 16 - 40
Inlet Pressure up to 40 bar
Outlet Pressure 1.5 - 6 or 5 - 12 bar
Kvs-Value 15 - 170 m³/h
Temperature 70 °C
Medium water

Description

Self-acting pressure reducers are simple control valves offering accurate
control while being easy to install and maintain. They control the
pressure downstream of the valve without requiring pneumatic or
electrical control elements.
The VRCD (DM 644) pressure-reducing valve is a piston-controlled,
spring-loaded proportional regulator with relief for large throughputs.
The housing is made of spheroidal graphite iron with a continuous
epoxy coating. The valve cone is soft-sealed.
The outlet pressure to be controlled is balanced across the control unit
by the force of the valve spring (set pressure). As the outlet pressure rises
above the pressure set using the adjusting screw, the valve cone moves
towards the seat and the volume of medium is reduced. As the outlet
pressure drops, the valve control orifice increases; when the pipeline is
depressurised, the valve is open. Rotating the adjusting screw clockwise
increases the outlet pressure.
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 V.

Standard

» Designed acc. to EN-1074/4
» Flanges as per EN 1092/2
» Pressure stage PN 16
» Body made of spheroidal cast iron GJS 450-10 with epoxy coating in
blue RAL 5005, thickness min. 250 μm
» Internal parts made of stainless steel 1.4301
» Closed spring cap
» Internal control bore
» Coating as per DVGW W270 and KTW recommendation of the
German Ministry for Health
» Pressure gauge pre-installed

Options

» Internal parts made of 1.4404
» Elastomers made of EPDM or Viton
» Pressure stages PN 25 and PN 40
» Special designs on request:
- Nickel-plated version for air and liquids up to 100°C,
elastomers made of Viton
- Diaphragm-controlled version for higher Control accuracy,
smaller pressure ranges
- High pressure version, pressure stage PN 64, for air and water
- Flanges drilled in acc. with ANSI
Operating instructions, know how and safety instructions must be
observed. The pressure has always been indicated as overpressure.
We reserve the right to alter technical specifications without notice.