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Safety relief valve

Pilot operated safety relief valve

Pilot operated safety relief valve ,newly -structure,is mainly applied to such trades as petroleum&natural gas,Chemistry,electric,metallurgy&burning gas.It is the best super-pressure protecting equipment on press equipment,Container,or pipeline.It is mainly characterized by shifting direct function of spring to indirect function of guide valve,What's more,main valve,applying for sleeve piston&double sealed seat,It is characterized by high precision of action,good recycling function,fast turning back to seat,ability to high-pressure leaking,long working time&security,together with read-adjustment on line,automatic turning back to seat after leaking again and again,tight closure,operating and maintaining convenience.

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Description

Pilot operated safety relief valve ,newly -structure,is mainly applied to such trades as petroleum&natural gas,Chemistry,electric,metallurgy&burning gas.It is the best super-pressure protecting equipment on press equipment,Container,or pipeline.It is mainly characterized by shifting direct function of spring to indirect function of guide valve,What's more,main valve,applying for sleeve piston&double sealed seat,It is characterized by high precision of action,good recycling function,fast turning back to seat,ability to high-pressure leaking,long working time&security,together with read-adjustment on line,automatic turning back to seat after leaking again and again,tight closure,operating and maintaining convenience.


Standards Compliance:
Design and Manufacture: API RP 520
Face to Face(end to end): API 526
Test and Inspection: API 527


In order to offer a quotation,we need specifications as following:
1.Flange connection standard
2.Pressure Rating
3.Size
4.Set Pressure
5.Material for Body&Trim (Material for inside parts).
6.Operation type: With lever or not 
7.Medium
8.Working Temperature


Main property specifiecation

Nominal Pressure PN(Class) 150 300 600 900 150
Body strength Ps(Mpa) 3 7.5 15 22.5 37.5
Set pressure Pk(Mpa) 0.1-2 1.6-5 3.2-10 8-25 10-25
Seal pressure Pm(Mpa) 90%Pk
Reseation pressure Ph(Mpa) ≥90%Pk
Relieving Pressure Pp(Mpa) ≤1.1Pk
Lift height H(mm) ≥1/4 d0
Appropriate temp. ≤250℃ 
Appropriate Medium Air, oil, water, corrosive medium


Code of throat diameter

Code Diameter Code Diameter
D 10 L 20
E 13 M 55
F 16 N 60
G 20.5 P 72
H 26 Q 96
J 33 R 115
K 40 T 148

Materials for main parts

Main dimension


Size Orifice Inlet LB Outlet LB L L1 C Size Orifice Inlet LB Outlet LB L L1 C
1" X 2" D.E.F 150 150 115 105 106 2" x 3" G.H.J 150 150 130 130 457
300 150 115 105 106 300 150 130 130 457
600 150 115 105 106 600 150 130 130 457
900 300 121 125 508 900 300 167 167 559
1500 300 121 125 508 1500 300 167 167 559
2500 300 121 125 508 2500 300 178 178 559
11/2" x2" D.E.F 150 150 121 124 432 3" x4" J.K.L 150 150 156 156 483
300 150 121 124 432 300 150 156 156 483
600 150 121 124 432 600 150 162 162 483
900 300 140 149 533 900 300 190 190 610
1500 300 140 149 533 1500 300 190 190 610
2500 300 140 149 533




11/2" x3" G.H 150 150 124 130 457 4" x 6" L.M.N.P 150 150 229 181 559
300 150 124 130 457 300 150 229 181 559
600 150 124 130 457 600 150 229 181 559
900 300 171 162 559 900 300 233 249 711
1500 300 171 162 559 1500 300 233 249 711
2500 300 171 162 559 2500 600 264 249 711
6" x8" Q.R 150 150 240 240 635 8" x10" T 150 150 279 276 711
300 150 240 240 635 300 150 279 276 711
600 150 240 240 635 600 150 279 297 737


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