Non-Rising Stem, Single Wedge Disc
Fig 2129
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
Resistant 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 non-rising stems
Single wedge discs threaded to engage with thread on stem, raising or lowering disc as stem is turned. Threads are long enough to be fully engaged whether valve is open or closed. Disc has wing guides which mate with channels in the body.
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.
Screw End: Fig 2129 (Class 125); Fig 2153 (Class 150)
Solder End: Fig 2133 (Class 125)
