High Efficiency

Type 821

Pilot operated safety valve - Modulate Action

Approvals

LESER High Efficiency safety valves of Type 821 are designed, marked, produced and approved according to the requirements of the following regulations:

Technical specifications Type 821

Nominal Diameter at Inlet
DN 25 - DN 200 | 1" - 8"
Orifice
API Standard as well as Extra Orifice: 1 D 2 - 8 T 10 / 1 G 2 - 8 T+ 10
Actual Orifice Diameter d₀
11 - 180 mm | 0.433 - 7.087 in
Actual Orifice Area A₀
95 - 25446.9 mm² | 0.147 - 39.443 in²
Pressure
2.5 - 426 bar | 36 - 6170 psig
Flange Rating Inlet
PN 10 - PN 400 | CL150 - CL2500
Temperature (in accordance with DIN EN)
-45 to 200 °C (Special: -162 to 300 °C) | -49 to 392 °F (Special: -259.6 to 572 °F)
Temperatur (nach ASME)
-45 to 200 °C (Special: -162 to 300 °C) | -49 to 392 °F (Special: -259.6 to 572 °F)
Body Material
1.0619, 1.4408 (Special: Hi Alloy) | SA 216 WCB, SA 351 CF8M, SA 352 LCB (Special: Hi Alloy)
Valve Connection
Flange acc. to DIN EN 1092 or acc. to ASME B 16.5 or acc. to JIS 2220
Load Type
Controlled by process medium
Approvals
ASME Sec. VIII Div. 1, PED/ DIN EN ISO 4126-4, PED/ AD 2000-Merkblatt A2, AQSIQ, EAC, TSSA
Classification societies
LR, RINA, DNV GL, BV
Specials
Pilot action type: Modulate Action | Open: max. 10% opening pressure tolerance | Closed: max. 7% closing pressure tolerance | Application: Steam, gasses and liquids

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