Spring Loaded

A37H/A38Y/A43H Duplex Spring Safety Valve (PN16/25/40)

ModelA37H-16/25/40-C; A38Y-16/25/40-C; A43H-16/25/40-C

A37H-16/25/40-C; A38Y-16/25/40-C; A43H-16/25/40-C

A37H/A38Y/A43H Duplex Spring Safety Valve (PN16/25/40)

Duplex spring safety valve assembly with two safety valves of the same model and size mounted on a Y-type joint. Designed for steam and air overpressure protection at temperatures up to 350°C, with PN16, PN25 and PN40 ratings and a common inlet size range of DN50–DN150.
Product
A37H/A38Y/A43H Duplex Spring Safety Valve (PN16/25/40)
Family
Spring Loaded
Model
A37H-16/25/40-C; A38Y-16/25/40-C; A43H-16/25/40-C

Product Overview

Operating purpose and application context

Use

This safety valve is used for equipment and pipelines handling steam, air and similar media at operating temperatures up to 350°C. When the pressure in the equipment or pipeline exceeds the allowable value, the valve opens automatically and then discharges at full capacity. When the pressure drops to the specified value, the valve closes automatically to ensure the safe operation of the equipment and pipelines.

Assembly Description

The assembly consists of two safety valves of the same model and size mounted on a Y-type joint. The nominal diameter of the assembly refers to the inlet diameter of the Y-type joint.

Main Component Materials

The Y-type joint is made of WCB. The materials of the remaining components of the A37H, A38Y and A43H safety valves are the same as those used in the corresponding A47H and A48Y spring loaded safety valves.

Technical Data

Operating and connection data

Only populated values from this Product record are displayed.

Pressure Range
PN16 / PN25 / PN40 (1.6 / 2.5 / 4.0 MPa)
Temperature Range
≤ 350 °C
Size Range
Y-joint inlet: DN50–DN150; Outlet per valve: DN32–DN125 (A37H/A43H), DN40–DN125 (A38Y)
Connection Type
Flanged

Product Datasheet

Connection Dimension Tables

Main connection dimensions and corresponding nominal-diameter references.

Main Connection Dimensions

Type Dimensions
DNL L1 BDN′ d0 H
16 C A37H- 25 40
50115225165322 × 25310
80140310205652 × 50415
100160355255802 × 65420
1251704002751002 × 80540
1501904403001252 × 100625
16 C A38Y- 25 40
50198225165402 × 20310
80230285190652 × 32335
100275350230802 × 40420
1503434002751252 × 65555
16 C A43H- 25 40
50115225165322 × 25310
80135285190502 × 40380
100160355255802 × 65420
1251704002751002 × 80540
1501904403001252 × 100625

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A37H / A47H Nominal Diameter Reference

A37H Type Nominal Diameter5080100125150
Relevant A47H Type Nominal Diameter326580100125

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A38H / A48H Nominal Diameter Reference

A38H Type Nominal Diameter5080100150
Relevant A48H Type Nominal Diameter325065100

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A43H / A47H Nominal Diameter Reference

A43H Type Nominal Diameter5080100125150
Relevant A47H Type Nominal Diameter325080100125

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Dimensions and nominal-diameter references are reproduced from the supplied source table. Confirm the applicable drawing and units before publication or contractual use.

Operating Context

Where this product is currently classified

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