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Type 438 Available designs Type 438 40 Cap H2 18 Adjusting screw with bushing 19 Lock nut Axial needle 69 beering 16 Spring plate 12 Spindle 54 Spring 2 7 Outlet body O-ring disc 1 Body Conventional design Threaded connection Long version Threaded connection Outlet flange 2.4 Outlet adaptor 2.1 Inlet flange 48 Conventional design Flange connection 02/02 LWN 481.01-E
Type 438 Available designs – materials Materials Item Component Remarks Type 4383 Type 4384 1 Base / Inlet body 2 Outlet body Threaded connection Flange connection Long version 2.1 Outlet adaptor Flange connection 2.4 Outlet flange Flange connection 7 O-ring disc 7.4 Soft seal O-ring 12 Spindle 16 Spring plate 18 Adjusting screw with bushing 19 Lock nut 40 Cap H2 “N” “K” “D” “L” “C” 48 Inlet flange Flange connection 54 Spring 57 Pin 61 Ball 69 Axial needle beering Long version 1.4104 1.4404 SA 479 430 SA 479 316L 1.4404 1.4404 SA 479 316L SA 479 316L 1.4404 1.4404 SA 479 316L SA 479 316L 1.4104 1.4404 SA 479 430 SA 479 316L 1.4404 1.4404 316L 316L 1.4404 1.4404 316L 316L 1.4404 1.4404 SA 479 316L SA 479 316L NBR NBR Nitrile-Butadiene Nitrile-Butadiene CR CR Chloroprene Chloroprene EPDM EPDM Ethylen-Propylene-Diene Ethylen-Propylene-Diene FKM FKM Fluorocarbon Fluorocarbon FFKM FFKM Perflouro Perflouro 1.4021 1.4404 420 316L 1.4104 1.4404 Chrome steel 316L 1.4104 / PTFE 1.4404 / PTFE Chrome steel / PTFE 316L / PTFE 1.0718 1.4404 Steel 316L 1.0718 1.4404 Steel 316L 1.4404 1.4404 316L 316L 1.4310 1.4310 Stainless steel Stainless steel 1.4310 1.4310 Stainless steel Stainless steel 1.3541 1.4401 Hardened stainless steel 316 1.4404 1.4404 316L 316L Type 438 Please notice: – Modifications reserved by LESER. – LESER can upgrade materials without notice. – Every part can be replaced by other material acc. to customer specification. LWN 481.01-E 02/03
Page 1 and 2: Compact Performance Safety Relief V
Page 3 and 4: General Type 437 Orifice diameter d
Page 5 and 6: Contents Type 459 05/01 Materials
Page 7 and 8: General Information General Applica
Page 9 and 10: Valve finder General How to find th
Page 11 and 12: Valve selection General Valve size
Page 13 and 14: How to use General Sample Determina
Page 15 and 16: How to use General 7 Base of capaci
Page 17 and 18: Sour gas service (H 2 S) General No
Page 19 and 20: Type Type 437 Type 437 Packed knob
Page 21 and 22: Type 437 Available designs - materi
Page 23 and 24: Type 437 Type 437 4 5 6 Options Doc
Page 25 and 26: Type 437 How to order - Article num
Page 27 and 28: Type 437 Dimensions and weights - M
Page 29 and 30: Type 437 Dimensions and weights - U
Page 31 and 32: Type 437 Order information - Spare
Page 33 and 34: Type 437 Approvals Type 437 Approva
Page 35 and 36: Type 437 Capacities - Air Capacitie
Page 37 and 38: Type 437 Determination of coefficen
Page 39: Type Type 438 Packed knob H4 Conven
Page 43 and 44: Type 438 4 5 6 Options Documentatio
Page 51 and 52: Type 438 Order information - Spare
Page 53 and 54: Type 438 Approvals Approvals Actual
Page 55 and 56: Type 438 Determination of coefficen
Page 57 and 58: Type 439 Packed knob H4 Type 439 Sa
Page 63 and 64: Type 439 Pressure temperature ratin
Page 69 and 70: Type 439 Available Options Male thr
Page 71 and 72: Type 439 Capacities Capacities acco
Page 73 and 74: Accessories and Options Contents Ch
Page 75 and 76: Accessories and Options Caps and le
Page 77 and 78: Accessories and Options Available c
Page 79 and 80: Accessories and Options Sealing sur
Page 81 and 82: Accessories and Options Heating jac
Page 83 and 84: Type Type 459 Plain lever H3 459 Sa
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Type 459 Dimensions and weights - M
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Type 459 Dimensions and weights - U
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Type 459 Pressure temperature ratin
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Type 459 Order information - Spare
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Type 459 Approvals Europe Approvals
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Type 459 Capacities - US Units Capa
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Type 459 HDD Safety Relief Valves H
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Type 459 HDD Available designs - ma
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Type 459 HDD 4 5 6 Options Document
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Type 459 HDD How to order - Article
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Type 459 HDD Dimensions and weights
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Type 459 HDD Order information - Sp
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Type 459 HDD Approvals Europe Appro
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Type 459 HDD Capacities - US Units
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Type Type 462 Plain lever H3 462 Sa
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Type 462 Available designs - materi
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Type 462 4 5 6 Options Documentatio
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Type 462 How to order - Article num
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Type 462 Dimensions and weights - M
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Type 462 Dimensions and weights - U
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Type 462 Pressure temperature ratin
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Type 462 Order information - Spare
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Type 462 Approvals Europe Approvals
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Type 462 Capacities - US Units Capa
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Type 462 HDD Safety Relief Valves H
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Type 462 HDD Available designs - ma
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Type 462 HDD 4 5 6 Options Document
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Type 462 HDD How to order - Article
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Type 462 HDD Order information - Sp
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Type 462 HDD Approvals Europe Appro
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Type 462 HDD Capacities - US Units
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Accessories and Options Contents Ch
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Accessories and Options Overview Op
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Accessories and Options Caps and le
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Accessories and Options Available c
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Accessories and Options Sealing sur
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Accessories and Options Heating jac
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Accessories and Options Balanced be
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Accessories and Options O-ring damp
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Accessories and Options Lift restri
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