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Check Valves

Silent Check Valve

Spring-assisted non-return valve engineered to reduce slam and water hammer.

Silent Check Valve

Engineered around the medium, pressure, temperature and operating duty.

Product overview

Spring-assisted non-return valve engineered for rapid, quiet closure before flow reversal, helping reduce check-valve slam and water hammer.

Greysen reviews the complete operating case before confirming the valve. Body style, wetted materials, sealing system, connection standard and operator are matched as one project configuration.

Typical technical specification

Nominal sizeDN40–DN600 (1½–24 in)
Pressure ratingPN10 / PN16 / PN25; Class 125 / 150 options
Body materialsCast iron, ductile iron, carbon steel or stainless steel
Disc / trimStainless steel or bronze disc and spring
Seat / sealingEPDM, NBR or metal seat
End connectionWafer or flanged
Design & testingEN project specification; EN 12266-1 or API 598 testing
Typical mediaWater, HVAC fluids and compatible clean liquids

DESIGN DETAILS

Features and benefits

01

Valve construction

Spring-assisted closure responds before high reverse velocity develops.

02

Sealing performance

Short disc travel reduces closing time and mechanical impact.

03

Reliable operation

Compact axial-flow arrangement saves installation space.

04

Project flexibility

Low-cracking-pressure options support pump discharge duties.

CONFIGURATION OPTIONS

Materials and sealing selection

Material combinations are reviewed against corrosion, erosion, temperature and required service life. The final approved data sheet defines every pressure-containing and wetted component.

Body

Cast iron, ductile iron, carbon steel or stainless steel

Trim

Stainless steel or bronze disc and spring

Seat & seals

EPDM, NBR or metal seat

Connection

Wafer or flanged

VALVE + OPERATOR

Operation and automation

Manual and automated packages are selected using the valve operating load, maximum differential pressure, required speed and available site utilities.

Manual operation

Lever, handwheel or gearbox options are matched to size, torque and access.

Pneumatic actuation

Double-acting or spring-return packages can include solenoid, switch box and positioner.

Electric actuation

On/off or modulating actuators are configured for voltage, duty, enclosure and control signal.

Package verification

Torque or thrust, safety factor, mounting interface, travel time and fail position are checked together.

APPLICATION REVIEW

Information for correct selection

  1. Nominal size, pressure class and mating connection standard.
  2. Medium, concentration, solids and minimum/maximum temperature.
  3. Normal and maximum differential pressure, flow rate and cycle frequency.
  4. Manual or actuated operation, fail position, control signal and required travel time.

Typical applications

  • Pump discharge
  • High-rise water systems
  • HVAC circulation
  • Industrial cooling water

Engineering checks

  • Pressure-temperature suitability
  • Material and media compatibility
  • Flow velocity and operating load
  • Installation orientation and maintenance access

PROJECT SUPPORT

Technical documentation

Request the documents required for consultant review, procurement and site handover. Availability is confirmed for the selected product and order.

  • Product data sheet
  • General arrangement drawing
  • Installation and maintenance guidance
  • Test and material documents when specified
Configuration note: Published ranges describe common industry configurations. Final dimensions, pressure-temperature limits, materials, certifications and standards are confirmed against the enquiry and approved data sheet.

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