Pressure Control Valves / Pressure Reducing Valves

Pressure Reducing Valves


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 DM 505Z pressure reducing valve is a diaphragm-controlled spring-loaded proportional control valve for small volumes. This pressure reducer is manufactured from deep-drawn stainless steel featuring excellent corrosion resistance. The tubular inlet spigot of the valve body accommodates the seat aperture. The valve cone is guided in the seat assembly and connected with the control diaphragm by means of a stirrup which surrounds the seat assembly.
Considering the intermediate piece incl. water trap between body and diaphragm and the metallic cone seal the valve is suitable for temperatures up to 200°C.

The spring module comprising spring cap, spring, adjusting screw, diaphragm and internal components, is connected to the valve body only by means of a clamp ring and two bolts. Changing the diaphragm or the complete spring assembly for a different control pressure range is extremely simple and does not call for special tools. The same applies to servicing and maintenance.

Changing the control pressure setting does not affect the height of the valve (non rising adjusting screw).

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.

The valves requires a sense line (to be installed on-site).

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.

» All stainless steel construction
» Non rising adjusting screw
» Quick-release body clamp ring
» Sense line connection
» Pressure gauge connection
» Pneumatic actuation
» For toxic or hazardous media: sealed spring cap complete with leakage line connection (incl. sealed adjusting screw). Must be installed with a leakage line capable of draining leaking medium safely and without pressure
» Various diaphragm and seal materials suitable for your medium
» Special connections: Aseptic, ANSI or JIS flanges, NPT, welding spigots; other connections on request
» Special versions on request

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.

Operating Instruction Operating Instruction
Know How Know How
Request Form Request Form

Weiterführende Informationen

Product Filter

Temperature ° C
Connection DN
Nominal Pressure PN
Inlet Pressure bar
Outlet Pressure bar
Kvs-Value m3/h
Cvs-Value US gal/min.
Connection G
Connection G Inch
Connection NPS
Class Class
Outlet Pressure psi
Inlet Pressure psi
Temperature °F
Reset Filtering Filtering

You can save the results of your search with all the associated information.

Save results Save results

Download Adobe Reader
It is recommended that the latest version of Adobe Reader be downloaded to ensure functional compliance with the viewing and printing mode of PDF files.
Our 48 hours promise

M-BASE our 48 hour promise

Valve Calculation Software

ValvePilot - valve calculation software


Call to Action - we help

Call to Action -