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DP27 Pilot Operated Pressure Reducing Valve is the new type pilot extra-huge membrane pressure reducing valve developed by our company,similar to Spirax Sarco Design. 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.
Field of Application.
Pressure Rating: 1.6- 2.5 Mpa.
Nominal Diameter: DN15-50 mm.
Body Material: Steel WCB.
Standard Flanges: DIN,ANSI,JIS.
Main Technical Parameters and Indexes of Performance.
Nominal pressure
PN25
Maximum design pressure(PMA)
25bar g @ 120
Maximum design temperature(TMA)
232 @ 21bar g
Minimum design temperature(TMI)
-10
Maximum upstream pressure for saturated steam service(PMO)
17barg
Maximum operating temperature(TMO)
232 @ 21bar g
Minimum operating temperature(TMIO)
0
Maximum 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
Main External Dimensions.
DN(mm)
L(mm)
H1(mm)
H(mm)
D(mm)
15
147
221
133
185
20
154
224
136
185
25
160
235
145
207
32
180
236
156
207
40
200
238
176
255
50
230
246
183
255
65
250
295
200
320
80
310
323
230
350
100
350
340
263
380
125
400
359
306
455
150
450
375
330
500