Description

Seat type construction. Allows free flow from it's port A to port B. Flow from port B to port A can be had by applying pilot pressure to it's port X. The decompression feature enables the valve to open in two stages progressively, allowing smooth and rapid exhaust of the compressed oil. Opening and closing time of the valve can be influenced by providing Throttle - Check Valves in the X port line. Flanged port A of the valve housing can be rotated around vertical axis through 360

Section

Unit Dimensions

Size

Mass Kg.

B1

B2

B3

D1

D2

D3

D4

D5

D6

D7

D8

D9

D10

D11

D12

100

79

217

20

3

195

105

36

G3/4

80

191.5

200

250

295

18

220

180

125

120

247

22

3

245

135

36

G3/4

105

241.5

250

310

370

18

250

210

150

167.5

260

22

3

273

142

44

G1

110

281.5

290

350

407

23

285

240

200

310

312

24

3

356

185

54

G1 1/4

135

368.5

380

445

510

23

340

295

 

Size

D11

D12

D13

D14

D15

D16

H1

H2

H3

H4

H5

H6

N1

β

R

T

100

220

180

158

107

33

114.5

485

136

171

81

26

120

8

22.5

156

159

125

250

210

188

132

40

152.5

597

160

210

90

27

173

8

22.5

195

200

150

285

240

212

159

40

178

708

180

250

100

27

255

8

22.5

230

235

200

340

295

268

207

45

237

980

240

352.5

120

33

391.5

12

15

310

315

Mounting cavity details

Size

D1H7

D20.1

D3min

D4 x N

D5

T1

T2+0.2

T3

T4

T5

Valve fixing screws
S. H. C. Screw size

Tightening Torque

100

200

191.6

180

M30 x 12

250

5

20

34

37

45

M30 x 120 L, 12 nos.

1200 Nm

125

250

241.6

230

M36 x 12

310

5

20

34

37

63

M36 x  150 L, 12 nos.

2250 Nm

150

290

281.6

270

M36 x 15

350

5

20

34

37

55

M36 x  150 L, 15 nos.

2250 Nm

200

380

368.6

355

M42 x 18

445

8

28.5

42

56

60

M42 x  180 L, 18 nos.

4100 Nm

 

Technical Specifications
 Construction .......................................  Poppet type, Pilot operated.
 Mounting type .....................................  Inside the oil tank mounting or flanged A port.
 Special machined cavity for port B.
 Mounting position ................................  Optional.
 Flow direction ......................................  Free flow from port A to port B.
 Piloted flow from port B to port A.
 Operating pressure ..............................  For port A 16 bar, B and X 315 bar.
 Cracking pressure ...............................  0.2 bar
 Pilot pressure required to .................... 
 have flow from port B to port A.
 Px > [(Pb - Pa) x 4] + 10 bar
 to open main poppet of the valve.
 Px > [(Pb - Pa) 10] + 10 bar 
 to open decompression poppet of the valve. 
 Where Px = Pilot pressure at port X (bar)
 Pa = Pressure at port A (bar)
 Pb = Pressure at port B (bar)
Pilot Volume  .......................................
Size 100 125 150 200
cm 46.8 88.5 135.7 313.6
Flow handling capacity .........................
 (Nominal) l/min.
At an average velocity of oil through the valve (m/sec)
Size 0.5 1 1.5 2 2.5 3 3.5 4
100

235

470

705

940

1175

1410

1635

1880

125

370

740

1110

1480

1850

2220

2590

2960

150

530

1060

1590

2120

2650

3180

3710

4240

200

950

1900

2850

3800

4750

5700

6650

7600

  Note : Recommended oil velocity during prefilling must be equal to or less than 2 m/sec.
 Oil velocity during pre-filling (suction) ..... Refer figure below
 Hydraulic medium ................................ Mineral oil
 Viscosity range ................................... 10 to 380 cSt.
 Working temperature range .................. -20 C to +70 C.
 Fluid cleanliness requirement ............... As per ISO code 16/13 or better.
 Mass .................................................. Refer individual table

 

Oil velocity during pre-filling (suction) for different arrangements :

Ordering Informations

 

Prefill and exhaust valve PV
Size
Mounting Styles
Pilot Operation
Design Code 14

Product Code

 

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Subject to revision.

Regd. office & Works :
78-80, Machhe Industrial Estate, Machhe, Belgaum - 590 014. Karnataka, INDIA. 
Phone :
+91-0831-2411001.  Fax : +91-0831-2411002 ,  
E-mail :
 
polyhydron@vsnl.com ,  Website :  www.polyhydron.com

 

Copyright Polyhydron Pvt. Ltd. Belgaum, India.
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Polyhydron Pvt. Ltd, Belgaum, India.

Updated on May 11, 2010 05:20 pm .