Technical Datasheet -- Stop Check Valve -- Lift Type Globe WCB

Stop Check Valve -- Lift Type Globe WCB

Combined Manual Stop and Automatic Lift Check Valve for Boiler Feed and Steam

Document No.SV-DS-CHK-009

RevisionRev A

DateMay 2026

ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India

This datasheet covers combined stop and lift check valves in WCB for boiler feed, steam turbine extraction, and process heater supply where both isolation and backflow prevention are required.

Technical Specifications

Parameter	Specification
Valve Size Range	DN50 to DN400 (2" to 16")
Pressure Rating	PN40 / Class 300 / Class 600 / Class 900
Body Material	WCB carbon steel, normalised and tempered
Disc Material	SS316 + Stellite 6 hard facing, guided lift disc
Seat Material	Integral Stellite 6 overlay, lapped to disc
Stem Material	SS316 rising stem with ACME threads for stop function
Guide	SS316 integral disc guide wings and body guide ribs
Spring	Optional Inconel X-750 spring-assisted closure
Packing	Graphite braided rings with anti-extrusion end rings
Gaskets	Spiral-wound SS316 + graphite for body/bonnet and flange joints
Temperature Range	-29°C to +425°C (WCB); +593°C with WC9
End Connections	Flanged ASME B16.5, butt weld ASME B16.25
Features	Combined stop and check, guided disc, optional spring, full port

Materials of Construction

Component	Material
Body	WCB carbon steel, sand cast, normalised and tempered, machined seat bore and flange faces
Bonnet	WCB carbon steel, bolted bonnet with spiral-wound gasket groove
Disc	SS316 lift disc with Stellite 6 cobalt alloy hard facing on seating surface
Seat	Integral WCB with Stellite 6 overlay; renewable screwed seat ring optional
Stem	SS316 rising stem with precision ACME threads and handwheel nut for manual stop function
Guide	SS316 guide wings integral to disc, matched to body guide ribs to prevent lateral movement
Spring	Optional Inconel X-750 spring for rapid closure; spring rate selected per service conditions

Testing & Inspection

Test	Requirement
Test Standard	API 598 / ISO 5208
Certification	CE, PED, ISO 9001, IBR on request

Applicable Standards

Standard	Description
Design Standard	ASME B16.34 / BS 1868 / API 600

Notes

Stop check valves are unidirectional; install with flow arrow matching pump discharge direction cast on body.
Spring-assisted closure is recommended for vertical installations and high-speed pump discharge to minimise water hammer.
For high-temperature steam service above 425°C, specify WC6 or WC9 body with corresponding trim and packing materials.
Disc and seat are lapped as a matched pair; do not interchange discs between valves or seating leakage will result.
IBR Form III-C certificate and third-party inspection available on request for boiler feed applications; allow 3 weeks.