SPeCIFICATIOnS
Maximum Operating Pressure
Brass: 2,000 psi (138 bar)
Carbon Steel: 3,000 psi (207 bar)
Stainless Steel: 3,000 psi (207 bar)
Cracking Pressure
1 to 2.5 psi (.07 to .17 bar)
Other cracking pressures available.
Consult factory.
Soft seat check valves if left seated for
a period of time, will have the rubber adhere
to the metal it is in contact with. This results
in an initial high crack point due to sticking.
The degree depends on many things
(time seated, pressure, etc.).
Pipe
Size A HeX B C orifice gpm
(lpm)
Cv
Factor
1/8" 7/16
(11.1)
31/32
(24.6)
.125
(3.2)
1.0
(3.8) .17
1/4" 5/8
(15.9)
1-3/8
(34.9)
.188
(4.8)
2.5
(9.5) .56
3/8" 3/4
(19.1)
1-5/8
(41.3)
.250
(6.4)
6.0
(22.7) 1.31
1/2" 7/8
(22.2)
2-1/16
(52.4)
.328
(8.3)
10.0
(37.9) 2.71
3/4” 1-1/8
(28.6)
2-1/4
(57.2)
.359
(9.1)
15.0
(56.8) 3.40
Leak-Tight
Size
nPTF Thread
Brass Steel Stainless
Steel
1/8" CMM10B1 — —
1/4" CMM20B CMM20S CMM2OSS2
3/8" CMM25B CMM25S —
1/2" CMM30B CMM30S —
Bubble-Tight
(O = O-ring, Q = Quad ring)
Size
nPTF Thread
Brass Steel Stainless
Steel
1/8" CMMO10B1 — —
1/4" CMMQ20B CMMQ20S CMMO20SS2
3/8" CMMO25B CMMO25S CMMO25SS
1/2" CMMQ30B CMMQ30S —
3/4" CMMQ35B — —
1
www.deltrolfluid.com
Operating Temperature range
-30° to +200° F (-34° to +93° C)
Threads
NPTF
Materials
Body: Brass, Steel, Stainless Steel 303
Ball: Stainless Steel 440
Spring: Stainless Steel 302
Ball Guide: Delrin®
Washer: Stainless Steel 304
O-Ring/Quad Ring: Buna-N
CMMQ30B DELTROL. AIR VALVE INLINE CHECK,
BRASS, SOFT SEAT FOR BUBBLE-TIGHT SEAL ON GAS, 1000 PSI,
FREE FLOWS IN ONE DIRECTION, BLOCKED IN OPPOSITE DIRECTION.
1/2" MALE PIPE THREAD.
DELTRON CMMQ30B, DELTROL PART # 10004-05