Design
Cast steel gate valve has been designed to conform to API 600.BS1414, and ASME B 16.34. Wall thickness dimensions comply with API 600. Face to face, end to end, and center to face dimensions of flanged and butt welded valves are in accordance with ASME B16.10 BS 2080, and ISO 5752. End flange dimension conform to ASME B16.5 for sizes NPS 24 and smaller, ASME B16.47 series A for sizes NPS 26 and larger. BW end dimension conform to ASME B16.25. Inspection and test are in accordance with API 598 and BS EN 12266.

Body and Bonnet
Castings are precisely machined. The gasket contacting surface is smooth finish that has a roughness between Ra 3.2 and 6.3 micrometer (125-250microinch). The surface roughness of gasket grooves of ring joint faces do not exceed 63 micro inch. Body seat construction of cast steel valves has three types: threaded seat ring, welded seat ring and integral seat ring. Provided with bosses for optional by-passes or drains.

Stem
Non-rotating stem with precision Acme threads and burnished finish. Double Acme for faster operation. All wedge gate valves are provided with upset forged T-head stems. 16 to 32 RMS stem surface finish, straightness and roundness are precisely controlled according to design and manufacturing standards.

Stuffing Box
Maximum 125 RMS surface finish. Cylindricity and verticality are precisely controlled according to design and manufacturing standards. Optional lantern rings and grease injectors are available.

Gland and Packing
Gland has a two-piece construction for easy alignment. Middle rings die formed 100% laminated flexible graphite rings, top and bottom rings lattice braided graphite fiber with corrosion inhibitor.

Bonnet Gasket
Class 150: Jacketed graphite with stainless steel. Class 300 Class 600 : Jacketed graphite with stainless steel or Spiral wound graphite with stainless steel. Class 900 and over: Ring joint metal gasket.

Bonnet Bolting
Coarse thread series for bolt sizes 1 inch and smaller,8-thread series for bolt sizes 11/8 inch and larger, both conform to Class 2A/2B tolerances.