Rising Stem, Uni-Ball Disc, Screw-in Bonnet
Fig 2125
Bronze bonnet gate valves are designed for steam, water, gas, oil and other general services. Valves are similar except for screw or solder pipe ends. Rising stems are specified where stem position is used for visually determining whether the valve is open or closed. Non-rising stems are used where headroom is limited. Valves are designed for maximum interchangeability of parts to reduce spare parts inventories.
Bodies
Full flow design. Connecting pipe ends will not distort valve seats. Same body is used for both rising and non-rising stem valves insuring interchangeability of trims. Disc guide channels are beveled at top of body for easy assembly.
Bonnets
Heavy screw-in bonnet collar with ample thread engagement insures a tight body-collar joint. Wide flats provide a firm wrench hold for disassembling valve.
Stems
Resistent to wear, corrosion and embrittlement. Long, accurately machined threads provide full thread contact. Heavy disc-stem connection withstands wearing action when opening valve and prevents stem failure under strain. Rising stems have a backseat surface above the stem threads where it is less exposed to scale and damage from line debris.
Discs for rising stems
Consist of two separate disc faces with an integral ball and socket connection between them; faces readily adjust to body seat taper, insuring tight closure. Sturdy disc collar strengthens disc-stem connection. Easy to assemble and with valve wide open the discs are drawn up into the bonnet and cannot drop off stem. Wing guides mate with channels in the body to hold the halves together and guide them during opening and closing.
Seats
Integral. Accurately tapered to insure perfect seating of the discs.
Repacking
Valves are repackable under pressure when wide open. Deep stuffing box and packing nut insure firm thread engagement when fully packed. Back seats above stem threads make scale formation unlikely and provide a tight seal.
Hexagon head gland
Permits the use of a light wrench to easily loosen and raise gland.
Non-slip handwheel
Insures tight closing.
Class 125: Fig 2125
Class 150: Fig 2150
