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High Efficiency

Type 811

Pilot Operated Safety Valves from the High Efficiency product group are especially suitable for applications with high pressure and offer optimal tightness right up to set pressure.  They meet all the requirements of API 526 and therewith offer 100% compatibility.  LESER offers pilot operated safety valves with rapid or proportional opening characteristics.     
The supplementary loading system for the High Efficiency product group uses external air pressure to guarantee better tightness up to set pressure. 

Approvals

Industries

  • Oil and Gas Industry
  • Chemical Industry
  • Petrochemical Industry
  • Power
  • Technical Gases
Product info Metric unit US unit

Key feature

pilot operated / Pop Action

pilot operated / Pop Action

Nominal diameter inlet

DN 25  -  DN 200 1"  -  8"

Nominal diameter inlet - Thread

Nominal diameter inlet - Flange

Nominal diameter outlet

Orifice

API Standard as well as Extra Orifice:
1 D 2 - 8 T 10 / 1 G 2 - 8 T+ 10
API Standard as well as Extra Orifice:
1 D 2 - 8 T 10 / 1 G 2 - 8 T+ 10

Pressure

Actual orifice diameter d0

11  -  190 mm 0,433  -  7,087 in

Actual orifice area A0

95  -  25446,9 mm² 0,147  -  39,443 in²

Pressure

2,5  -  256 bar 36  -  3705 psig

Flange rating inlet

PN 10  -  PN 250 CL150  -  CL1500

Temperature acc. to DIN EN

-45  to  200 °C -49  to  392 °F

Temperature acc. to ASME

-45  to  200 °C -49  to  392 °F

Body material

1.0619, 1.4408

SA 216 WCB, SA 351 CF8M, SA 352 LCB

KUB-Materials

Material inlet body

Valve connection

Flange acc. to DIN EN 1092 or acc.to ASME B 16.5 or JIS 2220

Flange acc. to DIN EN 1092 or acc.to ASME B 16.5 or JIS 2220

Type of loading

controlled by process medium

controlled by process medium

Approvals

ASME Sec. VIII Div. 1, PED/ DIN EN ISO 4126-4, PED/ AD 2000-Merkblatt A2, AQSIQ, EAC, TSSA

ASME Sec. VIII Div. 1, PED/ DIN EN ISO 4126-4, PED/ AD 2000-Merkblatt A2, AQSIQ, EAC, TSSA

Specials

Pilot action type: Pop Action
Full open (overpressure): 1%
Blowdown: 3 - 7% (adjustable also beyond API standard from 3 up to 15%)
Application: Gas  

Pilot action type: Pop Action
Full open (overpressure): 1%
Blowdown: 3 - 7% (adjustable also beyond API standard from 3 up to 15%)
Application: Gas  

Feature Option Code Schematic drawing
Connections outlet    
NACE material test certificate    

NACE material test certificate

R70

Soft sealing POSV complete O-ring disc, piston guide, seat, tubing, cover FKM

R04 (Standard)

Soft sealing POSV complete O-ring disc, piston guide, seat, tubing, cover EPDM

R05

Soft sealing POSV complete O-ring disc, piston guide, seat, tubing, cover FFKM

R06

Main valve

Special machining of flange RTJ-groove inlet

H62

Special machining of flange RTJ-groove outlet

H63

Special machining of flange DIN-flange facings inlet

diverse

Special machining of flange DIN-flange facings outlet

diverse

Metal sealing

R71

Drain bore G1/2

J19

Drain bore NPT 1/2"

R48

PTFE piston seal, spring loaded

R20

Top plate material 1.4404/ 316L

R46

Studs / nuts 1.4401 (A4-70)

J89

 
Pilot

Blowdown adjusted to x%

R44

Pilot test gag

R33

Pilot lifting device

R25

 
Accessories

Field test connection

R26

Pilot supply filter

R30

Manual blowdown to atmosphere

R27

Manual blowdown into main valve outlet

R24

Remote sensing

R28

Swagelok connection

R23

Backflow preventer

(Standard)

Needle valve for field test connection

R4A

Documentation    
Balanced Piston    
   
   
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