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Your position : home > products >>Pressure Reducing Valve >>>BRV7 direct acting bellows pressure reducing valve             [ Return ]
PRODUCT NAME:direct acting bellows pressure reducing valve
PRODUCT MODEL:BRV71 BRV73

spirax sarco BRV71 PRV
BRV71 BRV73 direct acting bellows pressure reducing valve

spirax sarco BRV73 PRV

Structural characteristic and purpose
This pressure reducing valve is robust direct acting bellows pressure reducing valve designed for use on steam,air and inert industrial type gases.The valve is available in four nominal sizes:DN25,DN32 ,DN40 and DN50. Set the outlet pressure through adjusting spring, the opening of valve flap enlarged when the outlet pressure reduced, the opening of valve flap decreased when the outlet pressure reached to the set pressure. The valve pressure of the medium acts on the area of corrugated tube and transduce to adjusting spring, realizing the function of pressure reducing and regulating.
This reducing valve is designed in meet of the need of energy saving. It has the characteristics of multi-function and light. You can adjust the pressure by rotating the plastic hand wheel, no need to use tool, the connection and installation is very convenient. The internal structure use corrugated tube, the sealing face has filtering mesh protecting device, which protect the internal parts from damage, and greatly prolong the service life.

Working Principle
In operation the valve will modulate as a result of a downstream pressure signal fed through the sensing orifice in the valve stem . This pressure acts on the control bellows generating a force which is balanced by the compressed control spring.The internal forces generated as a result of both upstream and downstream pressures acting on the area of the valve head are minimised by use of a balancing bellows . A graphite reinforced PTFE bush incorporated in both the pushrod/balancing bellows assembly and bottom cap assembly provides two point guiding.

Note: The maximum upstream pressure is 10 bar and it is recommended that the pressure turndown is limited to about 10:1.

BRV71 Screwed NPT connections
BRV73 Flanged PN16,ANSI 150 or JIS 10 connections.

The BRV71 and BRV73 are supplied with one of three colour coded springs:
Grey:                               for pressure control                                 0.14 to  1.7 bar g
Green:                            for pressure control                                 1.4   to   4.0 bar g
Orange:                         for pressure control                                  3.5  to    9.0 bar g

main technical parameters and indexes of performance
Nominal pressure
PN1.6Mpa
Tested pressure of shell
2.4Mpa
Sealing test pressure
1.76Mpa
Maximum upstream pressure
1.0Mpa
Maximum downstream pressure
0.9Mpa
Pressure range of outlet
0.014-0.9Mpa
Medium
Water, steam, liquid, air, oxygen, nitrogen, etc.
Operating temperature
¡Ü 210 ¡æ
material of main component
Name of component
Material of component
Valve body¡¢bottom cover¡¢valve cover
cast steel / CF8
valve flapValve rod ¡¢Valve seat
CF8
bellows
1Cr18Ni9Ti
MembraneHandwheel
Heat-resistant plastic
Spring of main valve
50CrVA
Adjusting spring
60Si2Mn
connecting dimension

DN

G

A

A1

DN25

1¨•

134
174

DN32

1 1/4¨•

134
179

DN40

1 1/2¨•

134
186
DN50
2¨•
134
186
Keywords£ºBRV7 direct acting bellows pressure reducing valve , pressure reducing valve , Steam pressure reducing valve
Related products: Pressure Reducing Valve , Steam Pressure Reducing Valve , Pilot operated pressure reducing valve , DP17 pilot operated pressure reducing valve , DP27 pilot operated pressure reducing valve , DPP17E pilot operated pressure reducing valve , DP143 pilot operated pressure reducing valve , Y14H/F direct acting bellows pressure reducing valve , BRV71 direct acting bellows pressure reducing valve .
TEL£º86-0577-57781011 FAX£º86-0577-67985602 E-mail£ºcngav@163.com 
Add£ºHe_yi Industrial Zone,Oubei Town,Wenzhou City,Zhejiang Province,P.R.China¡¡