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Return-Temperature Control Valves BW

Return-Temperature Control Valves BW

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Return-Temperature Control Valves BW

Product catalog summary

Features of the BW Series

Direct acting proportional controller designed to maintain constant return temperatures.
Suitable for regulating large heating systems, tracing systems, and temperature control of individual heat exchangers.
Prevents short-circuiting and automatically balances large systems.
Straight-through valve with balanced valve sleeve; closing temperature set at the factory.
Valves with external setting devices are available upon request.

Application

BW 31 is used for hot water applications.
BW 31A is used for thermal oils.
Available sizes: DN 15–25 mm.
External setting device available for BW 31.

End Connections and Overall Lengths

Type	Connections	Overall Length L [mm]
BW 31	Flanged EN PN 25	150, 150, 160, 200
BW 31	Flanged ASME	150, 150, 160, 200
BW 31	Screwed sockets	95, 95, 95, -
BW 31A	Flanged EN PN 25	150, 150, 160, 200
BW 31A	Flanged ASME	150, 150, 160, 200
BW 31A	Screwed sockets	95, 95, 95, -

Specifications

Material: 1.0460 (P250GH / C 22.8) / ASTM A105.
Size (DN): 15, 20, 25, 40.
Connection: Flanged to EN PN 40 or PN 25.
Service pressure PMA [bar]: Varies with temperature, up to 40 bar.
Inlet temperature TMA [°C]: Ranges from 20 to 400°C.

Adjustable Closing Temperatures

Without external setting device: BW 31 ranges from 60°C to 130°C, BW 31A ranges from 120°C to 270°C.
With external setting device: BW 31 ranges from 60°C to 130°C, BW 31A ranges from 90°C to 270°C.

Capacity Charts

Capacity charts for BW 31 and BW 31A are available in the data sheet.

Catalog excerpts

BW 31 for hot water BW 31 A for thermal oils > L BW 31, DN 1525 mm External setting devicefor BW 31 BW 31 PN 40 Material 1.0460 (P250GH / C 22.8) / ASTM A105 Size (DN) 15, 20, 25 Connection Flanged to EN PN 40 Service pressure PMA [bar] 40 37.3 30.2 25.8 23.1 Inlet temperature TMA [ְC] 20 100 200 300 400 BW 31 PN 25 Material 1.0460 (P250GH / C 22.8) / ASTM A105 Size (DN) 40 Connection Flanged to EN PN 25 Service pressure PMA [bar] 25 23.3 19.4 16.1 14.4 Inlet temperature TMA [C] 20 100 200 300 400 BW 31A PN 40 Material 1.0460 (P250GH / C 22.8) / ASTM A105 Size (DN) 15, 20, 25 Connection Flanged to EN PN 40 Service pressure PMA [bar] 40 37.3 30.2 25.8 23.1 Inlet temperature TMA [аC] 20 100 200 300 400 BW 31A PN 25 Material 1.0460 (P250GH / C 22.8) / ASTM A105 Size (DN) 40 Connection Flanged to EN PN 25 Service pressure PMA [bar] 25 23.3 19.4 16.1 14.4 Inlet temperature TMA [C] 20 100 200 300 400 Admissible differential pressure (upstream pressure 6 minus downstream pressure) ТȆ PMX [bar] > TypeConnectionsOverall length L [mm]DN 15DN 20DN 25DN 40 > 1 / > 2 " > 3 / > 4 "1"1 > 1 / > 2 " BW 31 Flanged EN PN 25150150160200Flanged ASME 150150150160200Screwed sockets959595 > Setting devicefor BW 31A BW 31A Flanged EN PN 25150150160200Flanged ASME 150150150160200Screwed sockets959595֖ >

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Return-Temperature Control Valves BW

Return-Temperature Control Valves BW

Catalog excerpts

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