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LESER GmbH
High EfficiencyType 821
The pilot-operated safety valves of the Type 821 - Modulate Action - open modulationg
Components & Design
Component data being added…
Technical Data
Set pressure(according to CE)
1,0 - 425,4 bar | 15,0 - 6170,0 psig
Set pressure (according to ASME)
1,0 - 650,0 bar | 15,0 - 9427,0 psig
Temperature(according to CE)
-162 - 320 °C | -260 – 608 °F
Temperature(according to ASME)
-162 - 320 °C | -260 – 608 °F
Connections DIN EN 1092
DN 25 - DN 200
Connections ASME B16.5
NPS 1 to NPS 8
Flange class Inlet DIN EN 1092
PN 10 - PN 400
Flange class Inlet ASME B16.5
Class 150 - Class 2500
Body material
1.0619, 1.4408 | SA 216 WCB, SA 351 CF8M, SA 352 LCB, SA 351 CF3M, SA 995 Gr 4A CD3MN (Duplex), SA 494 M35-1 (Monel), SA 494 CX2MW (Hastelloy)
Narrowest flow diameter d₀
11 - 180 mm | 0.433 - 7.087 in
Narrowest flow area A₀
95 - 25,446.9 mm² | 0.147 - 39.443 in²
pdf a back pressure ratio (i.e
a ratio of back pressure /
pdf range can be broadly divided into
the products providing added control the High Efficiency
pdf on the operating pressure range
For details on these
pdf ranges to ensure maximum tightness
Generally, at lower shows which sealing is used as a standard.
pdf main valve) via the pressure pickup
The pilot valve then be described as follows. During operation, the POSV
pdf in dome pressure
Also, the dome is vented. As a result,
pdf codes and standards
LESER sets the blowdown in the
pdf tional state medium does not flow
The closing force of
pdf exhaust seat and closes the feeding seat
This releases
pdf the dome pressure
The release of dome pressure is
pdf pressure to the dome of the main valve
Here, the sys-
pdf pressure range using an adjustment screw
On reaching
pdf cific parts and dimensions (e.g
the mounting of the
pdf closes the dome feeding seat
This keeps the dome pres-
pdf and at different pressure levels
To change the lift, there
pdf Body material
WCB 1.0619
pdf Screw Dimensions acc
to DIN EN 1092-1
pdf external test medium
the medium from the of the pilot. valve piston.
pdf pressure shall be tested
This allows a quick and simple
pdf Connection size
G 1/2 male and NPT 1/4" female Nitrogen
pdf Housing material
316L / 1.4404
pdf when the medium tends to block the piston
Manual blow-
pdf excessive pressure loss may occur
This can lead to chat- pressure drop.
pdf material
Spring (54) of Series 820 is not affected by the
pdf as a standard material
To order the NACE compliant
source url
https://www.leser.com/en/products/high-efficiency-posv/type-821/
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Equipment Model #159175
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Actuation Valve & Control Ltd · United KingdomAlfa Laval Aalborg Oy · DenmarkJ A Moody LLC · United StatesShiptec AG · SwitzerlandTMS - Hamburg Technical Marine Ser · GermanyValve Center Limited · Vereinigtes Koenigreich
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