Birkett Technical Catalogue - Safety Systems UK Ltd

SAFEFLO - SAFETY AND THERMAL RELIEF VALVE
Different types: There are two different types, both are conventional designs.
B Series - Safety and thermal relief valve, gas duty.
C Series - Safety and thermal relief valve, liquid duty.
D Series - Safety and thermal relief valve, gas, steam and liquid duty.
All are certified in accordance with ASME Code Section VIII.
SAFEFLO FIGURE NUMBERING SYSTEM
/ /
Orifice
Area in 2
1 0.062**
2 0.110**
3 0.196**
4 0.442**
6 0.070*
7 0.169*
Accessories
C Screwed cap
P Packed lever
G Test gag
F Ferrule (Government ring)
S Special feature
B Balanced piston†
R Soft seat†
Valve series
B Gas vapour
C Liquid
D Gas, steam and liquid
Connection size
1 1
⁄2" x 1" orifice 1, 2, 6 or 7
2 3
⁄4" x 1" orifice 1, 2, 6 or 7
3 1" x 1 1 ⁄2" orifice 3
4 1 1 ⁄2" x 2" orifice 4 – screwed only
5 1" x 1" orifice 1, 2, 6 or 7
Inlet connection type
A BSP Tr male screwed
B BSP female screwed
C API male screwed
D API female screwed
1 ANSI 300/600 RF flange
2 ANSI 900/1500 RF flange**
3 ANSI 2500 RF flange**
7 ANSI 150 RF flange
O Special**
Outlet connection type
E BSP female screwed
F API female screwed
1 ANSI 150 RF flange
2 ANSI 300 RF flange**
O Special**
Trim - nozzle and disc material
1 Stainless steel PH 17/4
2 Stainless steel 316
4 Hastelloy B**
5 Stainless steel 316 stellited**
6 Monel 400**
7 Stainless steel 304**
O Special**
Spring material
A Aluminium Coated CS
2 Stainless steel 316
6 Tungsten alloy
9 Hastelloy B**
T Aluminium Coated Tungsten
Z Inconel X750
O Special**
Body material
1 Carbon steel WCB
2 Carbon steel WCB NACE
3 Stainless steel CF8M NACE
4 Stainless steel CF8M
O Special**
*Available on D Series only.
**Not available on D Series.
†Available on 7D only.
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