RELIEF VALVE SPECIFICATIONS 

 

relief valve configurationsOrder part number designation

Valve Size & Threads Material & Color Options Seal Options Filter Options
Valve Size,
Threads
Size
Code
National Pipe Thread
1/8 - 27 NPT 02
1/4 - 18 NPT 04
3/8 - 18 NPT 06
1/2 - 14 NPT 08
3/4 - 14 NPT 12
1 - 11.5 NPT 16
1 1/4 - 11.5 NPT 20
Straight Thread (SAE)
.3750-24 UNF-2A 03
.4375-20 UNF-2A 04
.5625-18 UNF-2A 06
.7500-16 UNF-2A 08
.8750-14 UNF-2A 10
1.0625-12 UNF-2A 12
1.3125-12 UNF-2A 16
Body & Poppet
Material
Mat'l
Code
Brass, Plain 1
Brass, Nickel Plate 2
Alum., Anodize - Clear 3
Alum., Anodize - Blue 7
Alum., Anodize - Green 8
Alum., Anodize - Black 9
Alum., Anodize - Red A
Stainless, 303 4
Stainless, 316 5
Steel, Black Oxide 6
Seal Material Mat'l
Code
Buna N B
Neoprene N
Silicone S
Viton V
EPR E
TFE "Teflon" T
CTFE "Kel-F" K
Kalrez (Dupont) R
Filter Material Mat'l
Code
Polyethylene F
Bronze, Sintered Y
Cres, Wire Screen W

Crack and Reseat Performance Chart

Actual Cracking Pressure Range Reseat Pressure
% of Actual C.P.
.5 - 2.6 50 - 70 %
2.7 - 5.8 75 - 85 %
5.9 - 13.9 88 %
14.0 - 27.9 90 %
28 - 69 92 %
70 - 150 94 %
Note:  All figures at 70 deg. F

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