BRV71 and BRV73 SG Iron

Pressure Reducing Valves

Description

The BRV71 (screwed) and BRV73 (flanged) are SG iron bodied direct acting pressure reducing valves designed for applications using steam.
The BRV71 and BRV73 pressure reducing valves are supplied with one of three colour coded springs which are identified by the disc (13) located on the adjustment handwheel:

Grey	For downstream pressure control:	0.14 to 1.7 bar g (2.03 to 24.7 psi g)	Note: Where control spring ranges overlap always use the lower range to give better control.
Green	For downstream pressure control:	1.40 to 4.0 bar g (20.3 to 58.0 psi g)
Orange	For downstream pressure control:	3.50 to 9.0 bar g (50.8 to 131 psi g)

BRV71 and BRV73 SG Iron Pressure Reducing Valves

Sizes and pipe connections

1″, 1¼”, 1½” and 2″ screwed BSP and NPT.
DN25, DN32, DN40 and DN50 flanged PN16, JIS 10 and ANSI 150

Materials

RV71 and BRV73 SG Iron Pressure Reducing Valves

No.	Part	Material
1	Body assembly	SG iron	DIN 1693 GGG 40.3 ELNP coated
2	Pressure adjustment control spring	Silicon chrome	BS 2803 685 A55
3	Adjustment screw	Carbon steel	BS 970 230 M07
4	Plain washer	Stainless steel	Gr.18/10/3-4A
5	Adjustment knob	Mineral filled nylon	66 10B 140
6	Spirol pin	Chrome plated stainless steel	AISI 420
7	Spring plate	Cast iron	DIN 1691 GG 20
8	Spring housing	Aluminium	2ELNP coated
9	Upper gasket	Semi-rigid graphite laminated
10	Lower gasket	Semi-rigid graphite laminated
11	Bellows assembly	Stainless steel	316L
12	Bellows/pushrod assembly	Stainless steel/PTFE 15% graphite fill	316L
13	Printed cap	Polypropylene