Plunger Valve Manufacturer in Europe – Valvesonly Europe (Germany)

Valvesonly Europe manufactures plunger valves (flow control valves) in Germany, designed for precise regulation of flow and pressure in pipelines. Our plunger valves provide reliable throttling and isolation performance in waterworks, hydroelectric plants, power stations, desalination units, and process industries. Built to EN, DIN, and ISO standards, our valves ensure smooth operation, minimal cavitation, and long service life.

Function & Working

Plunger valves regulate flow by means of a cylindrical piston (plunger) moving axially inside a sleeve. This allows accurate control of velocity and pressure drop across the valve, avoiding turbulence and cavitation. Flow is throttled evenly around the circumference, ensuring stable hydraulic performance even at partial openings.

Design variations include:

  • Cavitation-optimized plunger design with anti-vibration guides

  • Flow straighteners to stabilize outlet velocity profiles

  • Manual, electric, or pneumatic actuation for control flexibility

Advantages

  • Linear throttling action with precise flow control

  • Designed to minimize cavitation and vibration at high pressure drops

  • Low-maintenance construction with replaceable sleeve and plunger guides

  • Suitable for both on/off isolation and modulating duties

  • Available with hydraulic dampers for surge control in water distribution networks

  • Engineered in Germany with full PED/CE conformity

Types Offered

  • Standard Plunger Valve – for general throttling applications

  • Cavitation-Resistant Plunger Valve – with flow deflectors for high ΔP service

  • Hydroelectric Plunger Valve – designed for turbines, penstocks, and dam discharge lines

  • Automatic Flow Control Valve – self-regulating with actuator integration

  • Actuated Plunger Valve – electric, pneumatic, or hydraulic for process automation

Materials

Category Material Standards / Grades Typical Use
Cast Iron Grey Iron EN-GJL-250 / ASTM A126 Low-pressure water networks
Ductile Iron SG Iron EN-GJS-400-15 / 500-7; ASTM A536 Water, HVAC, district heating
Carbon / Alloy Steel WCB, WCC, WC6, WC9 ASTM A216 / A217 Power plants, steam service
Stainless Steel CF8, CF8M, CF3, CF3M ASTM A351 Corrosive water and chemicals
Duplex / Super Duplex CD4MCu, S32750, S32760 ASTM A890 Seawater, desalination
High Alloys Alloy 20, Monel, Hastelloy, Inconel — Aggressive and specialty media
Seat / Sleeve Stainless Steel, Stellite, EPDM, NBR, PTFE — Wear resistance, sealing, elastomer lining

Technical Specifications

  • Size Range: DN80 – DN2000

  • Pressure Ratings: PN10 – PN40 / Class 150 – 300

  • End Connections: Flanged (EN 1092 / ASME), Butt Weld (BW)

  • Operation: Manual handwheel, Electric actuator, Pneumatic actuator, Hydraulic cylinder

  • Standards: EN 1074, EN 12516, DIN 3354, ISO 5208 leakage test

  • Special Options: Flow straighteners, anti-cavitation trim, surge damping devices

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