OS&Y Gate Valve

Why is the Outside Screw and Yoke (OS&Y) Design Preferred for Industrial Valves?

The external screw and yoke (OS&Y) design is more resistant to corrosion because the threads are located outside the fluid containment area. It is not subject to direct corrosion from the fluid. This significantly extends the life of the valve, and is equally advantageous in other harsh operating environments.

In addition, OS&Y's design is significantly different from other types of valves: the handwheel is mounted on a bushing at the top of the stem, rather than on the stem itself. This means that the handwheel does not rise as the valve opens, which is advantageous in applications where space is limited or operational efficiency is a concern.

The key benefits of the OS&Y design are evident in the enhanced durability, improved operational efficiency, and maintenance, which is why this design approach was adopted

OS&Y gate valve are primarily used in fire protection systems as control valves to manage water flow in sprinkler systems and standpipes. Compliance with standards such as NFPA 13 and NFPA 25 ensures that these valves meet stringent safety and operational requirements. Their ability to operate effectively at high pressures (up to 300 psi) makes them ideal for critical applications where reliability is vital.

By combining these design features, API600 OS&Y gate valve provide a reliable and durable solution for industrial applications, especially in working environments where corrosion risks are high and can be prioritized.

NO.	PART	ASTM Material
		WCB	LCB	WC6	CF8(M)	CF3(M)
1	BODY	A216 WCB	A352 LCB	A217 WC6	A351 CF8(M)	A351 CF3(M)
2	GATE	A216 WCB+13Cr	A352 LCB+13Cr	A217 WC6+STL	A351 CF8(M)	A351 CF3(M)
3	SEAT	A105+13Cr	A105+13Cr	A217 WC6+STL	A351 CF8(M)+STL6	A351 CF3(M)+STL6
4	STEM	A182 F6	A182 F6	A182 F6	A182 F304/F316	A182 F304L/F316L
5	BONNET BOLT	A193 B7	A320 L7	A193 B16	A193 B8(M)	A193 B8(M)
6	BONNET NUT	A194 2H	A194 7	A194 4	A194 8(M)	A194 8(M)
7	GASKET	SS304+GRAPHITE			PTFE/SS304+GRAPHITE	PTFE/SS316+GRAPHITE
8	BONNET	A216 WCB	A352 LCB	A217 WC6	A351 CF8(M)	A351 CF3(M)
9	BACKSEAT	A182 F6	A182 F6	A182 F6	-	-
10	PACKING	FLEXIBLE GRAPHITE			PTFE/FLEXIBLE GRAPHITE
11	GLAND	A182 F6	A182 F6	A182 F6	A182 F304	A182 F304L/F316L
12	GLAND FLANGE	A216 WCB	A352 LCB	A217 WC6	A351 CF8(M)	A351 CF3(M)
13	GLAND EYEBOLT	A193 B7			A193 B8	A193 B8
14	NUT	A194 2H			A194 8	A194 8
15	PIN	AISI 1025			AISI 1025
16	STEM NUT	BRONZE			BRONZE
17	HANDWHEEL NUT	AISI 1035			AISI 1035
18	SCREW	ASTM A36			ASTM A36
19	HANDWHEEL	A536 60-40-18			A536 60-40-18
20	BEARING GLAND	AISI 1035			AISI 1035
21	GREASE NIPPLE	BRASS			BRASS
22	NAMEPLATE	SS304			SS304

Dimensions data(mm)

Dimensions (mm) and weight for ANSI Class 150

Dimensions (mm) and weight for ANSI Class 300

Dimensions (mm) and weight for ANSI Class 600

Dimensions (mm) and weight for ANSI Class 900

Dimensions (mm) and weight for ANSI Class 1500