Check Valves are used to prevent back flow in pipe lines.  The four distinct designs; ball style, plug style, diaphragm style and wing styles each have their own place in process systems.

Ball Check Valves - Use a solid ball and gravity to form a seal against a rubber seat.   This style requires mounting in a horizontal position or spring assistance.  Offers best value in most cases.  1/2" - 2".

Wing Style Check Valves - Plates (wings) swing with the flow of liquid to offer low pressure drops and then swing back and seal on an internal surface upon reverse flow.   Require low back pressures to seal.  See below.

Diaphragm Style Check Valves - Uses an elastomer diaphragm that is in a normally closed position.  This provides for positive sealing at low pressures with out the use of springs or gravity to close.  See Below.

Plug Style Check Valves - Uses a sliding plug to prevent backflow.  Plug may depend upon gravity or spring assist.  See Below.

gf-360-A.jpg (5655 bytes) TYPE 360 – Ball Check Valves

Good flow characteristics.  Ball (A) is lifted by solution movement - Seats against elastomer (B) when flow stops to prevent back flow.  O-ring seals (D) at end connectors (C) provide easy installation and service.  Standard overall length dimensions with type 346 union valves.

  • PVC or CPVC
  • 3/8" – 2" with union connectors
  • EPDM or VitonŽ Seals
  • Solvent cement socket, NPT threads
  • Available Silicon-Free (contact KTH Sales)
gf-304.jpg (10932 bytes)
additional details
TYPE 304 – Y-Check Valve – PVC Translucent Body

With a clear body, the movement of the check will indicate flow.  Excellent flow characteristics. Minimum pressure loss. Mount horizontally or vertically. The soft seat (4) and weight loaded (5) check  offer excellent performance.  Efficient at low working pressures.  

  • ˝" through 3"
  • EPDM or VitonŽ Seals
  • Solvent cement spigot end connection
         smallnew.gif (926 bytes)Pom-cks.jpg (7386 bytes)CKS Series Check Valves - 1 1/2", 2" and 3"

Features:

  • Self sealing check valve is not dependent on gravity, reverse flow, or pressure to seal.   May be mounted in horizontal or vertical pipeline.
  • Low opening pressure - 1 to 1.5 PSI.
  • TeflonŽ PFA coated spring for bubble tight closing
  • PVC construction - Buna, VitonŽ or EPDM O-ring
  • 1 1/2",  2" or  3"
  • True Union end connections
  • Consult regarding CPVC, polypro or PVDF
  • Note:  Cv for 1 1/2" and 2" = 45, 3" = 82

    Download Bulletin for CKS Check Valves  

NEW - VKM Series Vacuum Breaker - 1 1/2", 2", 3" -- similar to CKS valve with a dust cover - see below VBM for information on vacuum breakers.

Diaphragm Check Valves - CKM Series Check Valves - 1/2" through 1"
Pom-ckm.jpg (12354 bytes) Features:
  • Self sealing diaphragm is not dependent on gravity, reverse flow, or pressure to seal.
  • No internal sliding parts to bind, rotate, or chatter.
  • Low diaphragm opening pressure - 1 to 1.5 PSI.
  • Smooth internal design minimizes cavitation and pressure loss.
  • Union nut simplifies valve installation.
  • Low price - yet designed to highest industrial standards.
  • Choice of PVC, glass filled polypropylene, PVDF , TeflonŽ. and CPVC 
  • VitonŽ or EPDM diaphragm
  • Note PVDF in 1/2" only.
  • Note:  Teflon - 3/4" and 1" only.

Bulletin in PDF format - download

Pom-ckd.jpg (5819 bytes)

 CKD Series Check Valves - 1/4" and 1/2"

Features:

  • Elastomer disc for quiet operation
  • Low pressure for opening and 1/2 PSI for closing
  • Choice of PVC, polypro, PVDF or TeflonŽ bodies.
  • VitonŽ or EPDM elastomer
  • Compact size: 1 1/2" diameter x 2 5/8" long
  • Note:  Cv - 1/2" = 1.0, 1/4" = 0.5

Pom-vbm.jpg (8579 bytes)

 VB and VBM Vacuum Breakers - 1/2", 3/4" and 1"

Features:

  • Choice of PVC, glass filled polypropylene, PVDF or TeflonŽ.
  • VitonŽ or EPDM diaphragm
  • 1/2", 3/4" or 1"
  • Use for anti-siphon on piping systems
  • Use for vacuum relief of tanks
  • Identical to CKM except with dusk cap on inlet
  • Allows air in through the dusk cap when vacuum reached 3 feet of liquid column.

Spears - Butterfly Check Valves

Features:

  • Quick Response Shut-off In Any Position
  • Chemical Resistant PVC and CPVC Construction
  • Field Replacement Flex-Seal - Choice of Reinforced EPDM or Viton

Bulletin in PDF format - Download


OEM Specials - We will consider modification of the above valves to meet special needs.  An example would be a spring in the CKM to increase the opening force to 5 PSI.  Contact KTH Sales with your special requirements.
Return to valves

Return to KTH Sales Home Page - E-Mail sales@kthsales.com - or phone KTH Sales @ 800-235-3604 for an immediate answer.