4374.3144 
Compact Performance Safety Relief Valve, Type 437,
closed bonnet, gastight lifting device H4,
for steam, gas and liquid service

Ordercode output, line 1: K7UK4ZH03M66M68M09X00V61V70L44

Ordercode output, line 2: MA5H01L23L34N8DN68
Medium: Liquid
Liquid
Inlet body material: 1.4404/316L
1.4404 / 316L
Outlet body material: (MA5)1.4401/ 1.4404/ 316/ 316L
Threaded inlet connection: (V61) male thread NPT 1/2 according to ASME B1.20.1
Threaded outlet connection: (V70) female thread NPT 1/2 according to ASME B1.20.1
Nominal diameter inlet: NPT 1/2
Nominal diameter outlet: NPT 1/2
Pressure rating inlet: PN 250
Pressure rating outlet: PN 160
d0 (ASME-DIN) [mm] 10,0
Alpha d S/G: 0,49
Alpha d L: 0,35
Set pressure: 25,00
Pressure unit: psi-g
Set pressure [bar-g] 1,72
Set pressure in [psi-g] 25,00
CDTP [bar-g] 1,72
CDTP [psi-g] 25,00
Operating temperature: 70
Temperature unit: °C - Celsius
Operating temperature in °C: 70,00
Operating temperature in °F: 158
Metal disc / mat.: (L44)
disc material 1.4404 / 316L
Spindle material: (K4Z)
Spindle material: 1.4404 / 316L
Adjusting screw material: (K7U) 1.4401/ 1.4404/ 316/ 316L + PTFE/ glass
Lifting device / cap material: (K8X)
Lifting device / cap material: 1.4401/ 1.4404/ 316/ 316L + FKM
Spring material: (X00)
default material
Material certification for: (H01)
Body – Item 1 with Material certification 3.1 acc. to DIN EN 10204
Material certification for: (L23)
Disc - Item 7 with Material certification 3.1 acc. to DIN EN 10204
Material certification for: (L34)
Outlet body – Item 2 with Material certification 3.1 acc. to DIN EN 10204

Design specification: (N68)
Approval according to ASME Sec. XIII for ASME VIII DIV. 1 (UV Stamp)

Documentation: (H03)
LESER CGA Certificate for Global Application inspection certificate 3.1 acc. to DIN
EN 10204

Documentation: (M66)
test report seat tightness acc. to API 527/EN 12266/ LGS 0201

Documentation: (M68)
Inspection certificate 3.1 acc. to DIN EN 10204:
Hydrostatic pressure test of body and further

pressure-containing components acc. to LGS 0209
Pressure setting: (M09)
with water

Add. Specification of Marking: (N8D)