Cast swing check valves - UNIFLOW Fig. 3S | Comeval | Philippopoulos s.a.
Cast swing check valves - UNIFLOW Fig. 3S | Comeval | Philippopoulos s.a.

Cast swing check valves - UNIFLOW Fig. 3S | Comeval

Comeval UNIFLOW Fig. 3S – Cast Swing Check Valve

The Comeval UNIFLOW Fig. 3S is a swing check valve with a hinged disc and metal seat, designed to prevent reverse flow in process piping. Operation is automatic, actuated by the process medium without external actuator. The 3S construction is cast, with a bolted cover and internal access for seat/disc inspection and maintenance.

Variants and Pressure Ratings

  • Standard: ANSI
  • End Connections: RF, RTJ, BW
  • Pressure Classes (3S/31 series): Class 150, 300, 600, 900, 1500, 2500
  • Size Range: DN50–DN900 / 2"–36"
  • Face-to-face: ASME B16.10
  • Flanges: ASME B16.5 up to 24", ASME B16.47 above 24"
  • BW ends: ASME B16.25

Materials and Trim

Available body materials: ASTM A216 WCB, ASTM A352 LCB, ASTM A217 WC1 / WC6 / WC9 / C5 / C12, and stainless options CF8, CF8M, CF3, CF3M. Seat and disc surfaces can be supplied in 13Cr or hard facing. Bolting options available for NACE MR0175 compliance.

Standards and Testing

Design in accordance with API 6D / BS 1868, marking per MSS SP-25, and testing per API 598. PED 2014/68/EU compliant, with available Comeval PED Module H and EAC certification.

Applications

Suitable for steam, water, oil, petroleum products, natural gas, air, compressed air, and other fluids or gases compatible with construction materials. Selection should be based on pressure-temperature rating per ASME B16.34, body material, trim, corrosion, and seat leakage requirements.

Installation

Install in horizontal lines with cover upwards, or in vertical lines with upward flow. Recommend minimum 6×DN downstream from pumps, elbows, or reducers, and 2×DN upstream from flow disturbances. For steam, gradual preheating and condensate drainage are required to prevent water hammer.

FAQ

When is Fig. 3S selected?
For ANSI lines requiring a cast swing check valve with metal seat and RF/RTJ/BW end options.

What should be checked before ordering?
Pressure class, NPS/DN, end connections, body material, trim, temperature, process fluid, and minimum flow for stable disc opening.

Standard (Options)
  • ANSI
Connection (Options)
  • Flanged
  • Butt Weld
Material (Options)
  • ASTM A216 WCB
  • ASTM A217 WC1
  • ASTM A217 WC6
  • ASTM A217 WC9
  • ASTM A217 Grade C5
  • ASTM A217 Grade C12
  • ASTM A352 LCB
Pressure Rating (Options)
  • 150 lbs
  • 300 lbs
  • 600 lbs
  • 900 lbs
  • 1500 lbs
  • 2500 lbs

Datasheet and documents

Description

Swing check valves to prevent the reverse of flow in a piping system, by means of its articulated disc, with metal seat. Wide application range by its rugged and simple design and easy maintenance.

Specification of the range:

Diverse design combinations by end connections (flanged, BW, SW, threads), materials of construction and trims, nominal size range (DN50-DN900 / 2-36") and design pressure range (PN16-420 / ANSI Clase 150-2500).

Other typical denominations: Cast steel Non return valves, backflow preventer Module H

Applications: HVAC, steam, gases, compressed air, etc.

Certifications: Comeval ped module h certificate of conformity, Eac certification 032, Eac declaration 010, Eac declaration 032, Piston check valves declaration of conformity, Piston check valves declaration of confo

Certificates

Comeval ped module h certificate of conformity 

Eac certification 032 

Eac declaration 010 

Eac declaration 032 

Piston check valves declaration of conformity 

Piston check valves declaration of conformity atex 

Swing check valves declaration of conformity 

Swing check valves declaration of conformity atex