Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm

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Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 1

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 2

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 3

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 4

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 5

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 6

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 7

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 8

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 9

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 10

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 11

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 12

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 13

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 14

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 15

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 16

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 17

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 18

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 19

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 20

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 21

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 22

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm — factory photo 23

Safety Valves

Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm

Name: Spring Loaded Thermal Safety Relief Valve — Modified Nozzle Flanged WC9 20 x 25 mm
Brand: Supreme Valves India
Availability: InStock
Rating: 4.8 (127 reviews)

Angle-discharge spring-loaded full-lift safety relief valve with modified nozzle, conventional design, close or open bonnet, open cap, and plain lever. ASTM A217 Gr. WC9 body for 20 x 25 mm flanged thermal and pressure relief on steam pipelines, small industrial boilers (SIB), and thermal expansion duty. Orifice seat diameter 12.7 mm to 19.0 mm. IBR and ASME compliant.

Key Applications

Steam Pipeline ProtectionSmall Industrial Boiler (SIB) ReliefThermal Expansion ReliefHot Water and Steam Systems

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Technical Specifications

Valve Type	Angle discharge, spring loaded, full lift, modified nozzle, thermal/pressure SRV
Nominal Size	20 x 25 mm (inlet x outlet)
Body Material	ASTM A217 Gr. WC9
Pressure Rating	Class 150 / Class 300; BS 10 Table H
Orifice Options	E (12.7 mm dia, 1.2645 cm²), F (19.0 mm dia, 2.83385 cm²)
Discharge Capacity Basis	IBR formula E = C x A x ((P x 0.980) + 1.033), constant C = 24, capacity in kg/hr saturated steam
Saturated Steam Capacity (Orifice F)	3 kg/cm²g = 270 kg/hr, 5 kg/cm²g = 404 kg/hr, 7 kg/cm²g = 537 kg/hr, 10 kg/cm²g = 737 kg/hr, 14 kg/cm²g = 1,003 kg/hr
Orifice E Applicability	12.7 mm orifice offered for small industrial boiler (SIB) duty only
End Connection	Flanged RF
Bonnet	Close bonnet or open bonnet with plain lever
Testing	Individual compressed-air test; API 527 optional
Manufacturer	Supreme Valves India

Material of Construction (MOC)

Component / Part	Available Materials
Body	ASTM A217 Gr. WC9
Open Bonnet / Cap / Lever	ASTM A217 Gr. WC9 / SG iron (optional)
Nozzle / Nozzle Ring / Guide	ASTM A351 Gr. CF8 / CF8M
Disc	SS 304 / SS 316
Stem / Adjusting Screw	SS 304 / SS 316 / SS 410
Setting Spring	Carbon steel / alloy steel / SS 302 / Inconel (optional)
Studs / Nuts	ASTM A193 Gr. B7 / A194 Gr. 2H
Gasket	Aramid fibre, non-asbestos

Dimensions & Weights

Inlet x Outlet	A ±3.0 mm	B ±3.0 mm	C ±100.0 mm
20 x 25 mm	95	112	330

Purchase Options

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Features & Benefits

Modified Nozzle Design

Top guiding with unobstructed seat bore for high discharge on compact flanged sizes.

SIB and Pipeline Duty

Suitable for small boiler and steam line protection with IBR sizing constant C=24.

WC9 Body

Alloy Steel construction (ASTM A217 Gr. WC9) for 20 x 25 mm service.

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Valve type: Angle discharge, spring loaded, full lift, modified nozzle, thermal/pressure SRV
Size: 20 x 25 mm (inlet x outlet)
Material: ASTM A217 Gr. WC9
Pressure class: Class 150 / Class 300; BS 10 Table H

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