Specification :

PRODUCT NAME : pilot operated pressure reducing valve
PRODUCT MODEL : DP27

Structural characteristic and purpose
This reducing valve the new type pilot extra-huge membrane pressure reducing valve developed by our company. It is greatly improved on basis of normal pressure reducing valve. The membrane use new material, enlarging the working area, so the slight change of upper pressure or lower pressure can be fed back to membrane of main valve, and adjust the opening of main valve to ensure the constant pressure of lower stream pressure.
Note: A variable rate conical pressure adjustment spring is fitted providing a down stream pressure range of 0.2-17bar g.
main technical parameters and indexes of performance
Nominal pressure PN25
Maximun design pressure( PMA) 25bar g @ 120
Maximun design temperature( TMA) 232 @ 21bar g
Minimun design temperature( TMI) -10
Maximun upstream pressure for saturated steam service( PMO) 17barg
Maximun operating temperature( TMO) 232 @ 21bar g
Minimun operating temperature( TMIO) 0
Maximun differential pressure( � PMX ) 17bar
Down stream pressure range 0.2-1.7bar g
Maximum cold hydraulic test pressure 38bar g

material of main component
Name of component Material of component
Valve body, valve cover WCB
Valve seat 2Cr13
valve flap 2Cr13
Valve rod 2Cr13
Membrane Brass
Adjusting spring 60Si2Mn