Cast steel bolted bonnet valves are manufactured of WCB WCB now offers a full line of cast steel gate, globe, and check valves. features leading edge design, engineering and manufacturing technology. Our valves meet the most stringent national and international standards for fugitive emissions. It is available in the alloys like LCB, LC2, WC6, WC9 and C5. They offer the ultimate in service for steam, air, gas, oil, vapor and high pressure installation. The basic dimension, i.e.wall thickness, face to face and flange comply with the relevant API and ANSI standards. The body is threaded or seal welded for renewable seats. Bosses are provided for drain taps or by-pass piping The bonnet is machined to accept the yoke sleeve and incorporates a stuffing box dimension in accordance with the API standard The wedge is part of the trim. It is in cast stainless and alloy steel for diameters up to 10” and in cast steel for larger valves. It is connected to the stem by means of a T-joint. The seat rings and stem, bushing are part of the trim. The seat rings are completely treaded outside and notched on their inner surface to ease installing and dismantling. The stem is ground to minimize friction and prevent damage to gland packing. Bonnet bushing is given to its machining and heat treatment to insure a proper seat especially. The yoke sleeve having high resistance to wear and a high melting point. It is designed to permit removal from the bonnet or the yoke while the valve is in service. Gate valves 6” 600lb. Class and above are fitted with a ball thrust bearing. Bonnet studs and nuts are manufactured from alloy steel to the relevant ASTM standard.