Plast-O-Matic CKM Diaphragm Check Valves

Series CKM Check Valves, normally closed in design, feature a patented diaphragm seal that will neither stick nor chatter and is automatic in action. The valves are not dependent upon gravity so they can be mounted in any position. Even in the absence of reverse flow or pressure, the diaphragm will automatically reposition itself to seal against the valve seat. This is achieved with or without the presence of reverse flow. The unique and patented diaphragm will seal in the identical location every time producing a more reliable and repetitive seal. The molded Series CKM models have only one moving part - the diaphragm. This provides both design simplicity and maximum operating dependability.

  • PVC, Corzan® CPVC or glass filled polypropylene
  • EPDM or Viton™ diaphragms
  • Female NPT
  • Dependable, repetitive, bubble-tight sealing
  • Union nut simplifies valve inspection/removal
  • Silent operation since no internal sliding or loose parts
  • If reverse pressure is present it creates a tighter seal
  • Diaphragm begins to open at approximately 1 to 1.5 psi
  • Inlet pressure rating @ 77°F: 150 psi (except PP with Viton™ which is 100 psi)
  • Maximum temp.: 140°F (PVC) & 180°F (PP & CPVC)
Stock Description Catalog Pg. Price
1/2" NPT PVC CKM Diaphragm Check Valve with EPDM Diaphragm
88249
1/2" NPT PVC CKM Diaphragm Check Valve with EPDM Diaphragm
$77.73​/Each
Save 5%2+$73.84/Each
Save 10%4+$69.95/Each
Save 15%12+$66.07/Each
P-386
$77.73​/Each
In Stock
3/4" NPT PVC CKM Diaphragm Check Valve with EPDM Diaphragm
88250
3/4" NPT PVC CKM Diaphragm Check Valve with EPDM Diaphragm
$92.24​/Each
Save 5%2+$87.62/Each
Save 10%4+$83.01/Each
Save 15%12+$78.40/Each
P-386
$92.24​/Each
In Stock
1" NPT PVC CKM Diaphragm Check Valve with EPDM Diaphragm
88251
1" NPT PVC CKM Diaphragm Check Valve with EPDM Diaphragm
$114.01​/Each
Save 5%2+$108.31/Each
Save 10%4+$102.60/Each
Save 15%12+$96.90/Each
P-386
$114.01​/Each
In Stock
1/2" NPT PVC CKM Diaphragm Check Valve with Viton™ Diaphragm
88258
1/2" NPT PVC CKM Diaphragm Check Valve with Viton™ Diaphragm
$84.99​/Each
Save 5%2+$80.74/Each
Save 10%4+$76.49/Each
Save 15%12+$72.24/Each
P-386
$84.99​/Each
In Stock
3/4" NPT PVC CKM Diaphragm Check Valve with Viton™ Diaphragm
88259
3/4" NPT PVC CKM Diaphragm Check Valve with Viton™ Diaphragm
$98.46​/Each
Save 5%2+$93.53/Each
Save 10%4+$88.61/Each
Save 15%12+$83.69/Each
P-386
$98.46​/Each
In Stock
1" NPT PVC CKM Diaphragm Check Valve with Viton™ Diaphragm
88260
1" NPT PVC CKM Diaphragm Check Valve with Viton™ Diaphragm
$120.22​/Each
Save 5%2+$114.20/Each
Save 10%4+$108.19/Each
Save 15%12+$102.18/Each
P-386
$120.22​/Each
In Stock
1/2" NPT PP CKM Diaphragm Check Valve with EPDM Diaphragm
88267
1/2" NPT PP CKM Diaphragm Check Valve with EPDM Diaphragm
$130.59​/Each
Save 5%2+$124.06/Each
Save 10%4+$117.53/Each
Save 15%12+$111.00/Each
P-386
$130.59​/Each
In Stock
3/4" NPT PP CKM Diaphragm Check Valve with EPDM Diaphragm
88268
3/4" NPT PP CKM Diaphragm Check Valve with EPDM Diaphragm
$153.40​/Each
Save 5%2+$145.73/Each
Save 10%4+$138.06/Each
Save 15%12+$130.39/Each
P-386
$153.40​/Each
In Stock
1" NPT PP CKM Diaphragm Check Valve with EPDM Diaphragm
88269
1" NPT PP CKM Diaphragm Check Valve with EPDM Diaphragm
$176.19​/Each
Save 5%2+$167.38/Each
Save 10%4+$158.57/Each
Save 15%12+$149.76/Each
P-386
$176.19​/Each
In Stock
1/2" NPT PP CKM Diaphragm Check Valve with Viton™ Diaphragm
88276
1/2" NPT PP CKM Diaphragm Check Valve with Viton™ Diaphragm
$136.80​/Each
Save 5%2+$129.96/Each
Save 10%4+$123.12/Each
Save 15%12+$116.28/Each
P-386
$136.80​/Each
Special Order
3/4" NPT PP CKM Diaphragm Check Valve with Viton™ Diaphragm
88277
3/4" NPT PP CKM Diaphragm Check Valve with Viton™ Diaphragm
$159.61​/Each
Save 5%2+$151.63/Each
Save 10%4+$143.64/Each
Save 15%12+$135.66/Each
P-386
$159.61​/Each
In Stock
1" NPT PP CKM Diaphragm Check Valve with Viton™ Diaphragm
88278
1" NPT PP CKM Diaphragm Check Valve with Viton™ Diaphragm
$182.41​/Each
Save 5%2+$173.29/Each
Save 10%4+$164.16/Each
Save 15%12+$155.04/Each
P-386
$182.41​/Each
In Stock
1/2" NPT CPVC CKM Diaphragm Check Valve with EPDM Diaphragm
88283
1/2" NPT CPVC CKM Diaphragm Check Valve with EPDM Diaphragm
$128.52​/Each
Save 5%2+$122.09/Each
Save 10%4+$115.66/Each
Save 15%12+$109.24/Each
P-386
$128.52​/Each
In Stock
3/4" NPT CPVC CKM Diaphragm Check Valve with EPDM Diaphragm
88284
3/4" NPT CPVC CKM Diaphragm Check Valve with EPDM Diaphragm
$151.31​/Each
Save 5%2+$143.74/Each
Save 10%4+$136.17/Each
Save 15%12+$128.61/Each
P-386
$151.31​/Each
In Stock
1" NPT CPVC CKM Diaphragm Check Valve with EPDM Diaphragm
88285
1" NPT CPVC CKM Diaphragm Check Valve with EPDM Diaphragm
$175.16​/Each
Save 5%2+$166.40/Each
Save 10%4+$157.64/Each
Save 15%12+$148.88/Each
P-386
$175.16​/Each
In Stock
1/2" NPT CPVC CKM Diaphragm Check Valve with Viton™ Diaphragm
88290
1/2" NPT CPVC CKM Diaphragm Check Valve with Viton™ Diaphragm
$134.73​/Each
Save 5%2+$127.99/Each
Save 10%4+$121.25/Each
Save 15%12+$114.52/Each
P-386
$134.73​/Each
In Stock
3/4" NPT CPVC CKM Diaphragm Check Valve with Viton™ Diaphragm
88291
3/4" NPT CPVC CKM Diaphragm Check Valve with Viton™ Diaphragm
$159.61​/Each
Save 5%2+$151.63/Each
Save 10%4+$143.64/Each
Save 15%12+$135.66/Each
P-386
$159.61​/Each
In Stock
1" NPT CPVC CKM Diaphragm Check Valve with Viton™ Diaphragm
88292
1" NPT CPVC CKM Diaphragm Check Valve with Viton™ Diaphragm
$182.41​/Each
Save 5%2+$173.29/Each
Save 10%4+$164.16/Each
Save 15%12+$155.04/Each
P-386
$182.41​/Each
In Stock

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