WM Diaphragm Valve
Rolling Stone Idler
Valves
Locomotives
Pumps
We specialize in the manufacturing, repairing and designing valves, locomotives and mining equipment.
Tel: 011 412 4536
Cell: 082 821 1910
Email: info@minetrack.co.za
Sizes: 50mm - 250mm
The Right 16 resilient seal gate valve is the most widely used of its type for water reticulation service in Europe. It conforms dimensionally to SABS 664 Class 16. The resilient seal gate valve is called for in 90 percent of waterworks applications in Europe. The reason for this can be seen in the features illustrated in the following pages.
Seating: Uniform contact between body and gate at every point ensures even compression of the rubber, guaranteeing a complete seal. The profile of the sealing surfaces is designed to eliminate wear on the seat faces as the gate closes. The sealing angle is constant and there is no sliding contact between faces in contact, eliminating any shearing, tearing or wearing of the rubber seal. The resilient seal accommodates body distortion resulting from pressure or pipe stresses, and offers drop-tight seal over the whole range of pressures.
Maintenance: Gland repacking is eliminated by the use of the nylon seal bush supporting spindle seal O-rings. With the valve in the ‘Full-Open’ position, a positive back seal is effected, enabling the spindle seals to be replaced with the valve under pressure. The bonnet is secured to the cover by two set screws and the whole assembly can be replaced within two minutes. Valve gates can be replaced without removing the body from the pipeline. All gates of the same size are interchangeable without ‘matching’.
Advantages
Positive shut-off: Positive tight shut-off over the whole range of pressures.
Reduced operational torque: Low gland friction reduces operating torque.
The polished stainless steel spindle is supported in the nylon housing bush
and sealed by two O-rings. By eliminating the conventional stuffing box the
spindle torque is reduced by 30 percent.
Convenient installation: The gate is positively guided by gate tongues
located in grooves in the body which, together with the nylon bush guiding
the spindle in the upper housing, permits installation of the valve in vertical,
horizontal and inclined piping.
No reduction gearing needed: Due to the low sealing and gland friction
torque, all valves in this series can be operated against a full differential
pressure of 1/6MPa without the use of reduction gearing.
No pockets: The smooth straight-through body passage reduces head loss to
little more than that of a straight pipe of the same length and diameter. There
are no recesses in the body where solids can lodge, and gate sealing flanges
are unaffected by solids in suspension.
Interchange ability: Supplied to
SABS 664 dimensions, the valves
are completely interchangeable
in the pipeline with wedge gate
valves of the same size. Flanged,
spigot and socket end body
configurations permit use of
the valve with steel, asbestoscement
and uPVC piping.
Minimal maintenance:
The valve gate and spindle seal
assembly can be changed in
less than five minutes without
removing the valve from the pipeline.
Chemical resistant: The stainless steel spindle is impervious to chemical
attack from chemicals used in water treatment.
Lining: Simple, clean lines of the internal body configuration.
Manual Operation
The table below indicates the differential pressure in kPa against which Right
valves can be closed using standard mechanisms. The figures are based on
the application by one man exerting an effort of 200 Newton’s simultaneously
with each hand on the rim of a standard hand wheel. In all cases spindle
threads are single-start 12.7mm pitch. For waterworks service, Right valves
can be operated up to the full differential pressure of 1.6MPa using a standard
Tee key without reduction gearing.
DIFFERENTIAL kPa |
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Valve Size |
50 | 80 | 100 | 150 | 200 | 250 | 300 |
1600 | 1600 | 1600 | 1520 | 750 | 585 | 585 |
Electric Operation
The table below indicates the torque required in Newton meters to overcome
the full differential pressure of 1.6MPa across the valve.
TORQUE N.m |
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Valve Size |
50 | 80 | 100 | 150 | 200 | 250 | 300 |
50 | 50 | 60 | 80 | 200 | 250 | 300 |