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■ Basic design : ASME B16.34, API 623, BS1873, MSS-SP134, Intergral seat type
■ Flange drilling : ANSI B16.5 (2" ~ 24")
■ Face to face : ANSI B16.10
■ Test : API 598

① BODY The body is in stainless steel.
The basic dimension,i.e.wall thickness, face to face and flanges comply with the relevant API and ANSI standards.
The body-to-bonnet flange is circular and the sealing surface for connection to the bonnet are recessed in the 150lb, 300lb, 600lb may be ring joint in the higher classes.
Bosses may be provided for drain taps or by-pass piping.

② EXTENDED BONNET The extended bonnet is in stainless steel.
It is machined to accept the yoke sleeve and incorporates a stuffing box dimension in accordance with the BS, API standard.

③ DISC The disc is part of the trim.
It is normally supplied of the flat, tapered or plug type or, on request, of the parabolic regulating type, always free to rotate on the stem.
Special attention is given to the seating face which is ground and lapped for a perfectly tight seal.

④ STEM The stem is part of the trim.
A ground backseat is provided to ensure perfectly tight seal to the stuffing box when the valve is fully open.
The stem is attached to the disc by means of a threaded ring which allows the disc to rotate.
The stem is ground to minimize friction and prevent damage to gland packing.

⑮ YOKE BUSH The yoke sleeve is made from stainless steel or ductile iron having high resistance to wear and a high melting point.
It is screwed into the bonnet and properly sized to withstand the stresses which develop when opening and closing the valve.

⑬, ⑭ BONNET BOLT/NUT Bonnet studs and nuts are manufactured from alloy or stainless steel to the relevant ASTM standard.

⑯ HANDWHEEL The steel or nodular iron handwheels are well shaped and large enough to give ease of movement when operating the valve, even under maximum differential pressure.