Data Sheet

Bulletin 71.1:SR5
6
Table 5. Materials of Construction
PART MATERIAL
Body 316L Stainless Steel, 20 µin (0,5 µm) Ra with Electropolish
Spring Case 316 Stainless Steel with Electropolish
Plug and Diaphragm Plate 316L Stainless Steel 20 µin (0,5 µm) Ra with Electropolish
Soft Seat Virgin PTFE or PEEK
Diaphragm EPDM(FDA), Virgin PTFE coated Fluoroelastomer, or 316L Stainless Steel
Control Springs Inconel or 302 Stainless Steel
Guide Ring and Upper and Lower Spring Seats 300 Series Stainless Steel
Adjusting Screw and Lock Nut 300 Series Stainless Steel
Closing Cap 300 Series Stainless Steel with Electropolish or Plastic
T-handle and Locking Lever 300 Series Stainless Steel
O-Rings EPDM (FDA), Virgin PTFE encapsulated Fluoroelastomer, or Virgin PTFE
Piston Ring PTFE with 302 Stainless Steel
Gaskets (SST diaphragm only) Expanded Virgin PTFE
Bolted Clamp 304 Stainless Steel with Brass or Stainless Steel Nuts
Bead Chain and Ring Grip 300 Series Stainless Steel
Table 6. Flow Coefcients
SIZE, INCH (DN)
WIDE OPEN COEFFICIENTS
(For Relief Valve Sizing)
C
1
K
m
F
L
X
T
F
d
C
g
C
v
C
s
1/2 (15) 39 1.3 1.9 29.8 0.73 0.85 0.56 0.47
3/4 (20) 82 2.7 4.1 31.1 0.87 0.93 0.61 0.36
1 (25) 223 6.4 11.2 34.9 0.87 0.93 0.77 0.43
1-1/2 x 1 (40 x 25) 231 6.9 11.6 33.5 0.87 0.93 0.71 0.43
1-1/2 (40) full port 457 12.4 22.9 36.9 0.87 0.93 0.86 0.34
2 (50) 929 29.5 46 31.5 0.78 0.88 0.63 0.32
3 (80) 1108 34.2 55 32.4 0.69 0.83 0.66 0.36
Table 4. Temperature Capabilities
SEAT TYPE DIAPHRAGM MATERIAL O-RING MATERIAL TEMPERATURE RANGE, °F (°C)
Metal (316L)
EPDM EPDM - 20 to 275 ( -28 to 135)
316L SST PTFE/FKM
(1)
+20 to 400 ( -6 to 204)
PTFE/FKM PTFE/FKM +20 to 400 ( -6 to 204)
Soft (PTFE/316L)
EPDM EPDM - 20 to 150 ( -28 to 65)
316L SST PTFE/FKM
(1)
+20 to 150 ( -6 to 65)
PTFE/FKM PTFE/FKM +20 to 150 ( -6 to 65)
Soft (PEEK/316L)
EPDM EPDM - 20 to 275 ( -28 to 135)
316L SST PTFE/FKM
(1)
+20 to 400 ( -6 to 204)
PTFE/FKM PTFE/FKM +20 to 400 ( -6 to 204)
1. O-ring material is PTFE for the 1/2 and 3/4 inch (DN 15 and 20) sizes. Temperature range is the same.