High Velocity Steam Duties
SOLUTION TO DIFFICULT HIGH VELOCITY STEAM DUTIES
We have identified that use of gate, globe, butterfly or parallel slide valves can have short operating life when high pressure steam is vented/drained.
The seats have to cope with very high velocities. The wear effect is compounded many times over if there is moisture present.
An
effective solution is to employ metal seated ball valves. In the open position,
ball valve seals are not exposed to high velocities from line fluid.
Other people have offered a similar solution, but have supplied reduced bore designs, sometimes considerably reduced below pipe bore. Also, valves are only unidirectional.
The best specification is to employ full bore, bi-directional, valves, i.e. live loaded seat.
Very high technology coatings are available for these arduous and erosive applications, e.g. tungsten carbide, applied by vapour deposition method, ensuring even coatings with excellent adhesion.
Trunnion mounted ball designs are available in all sizes, and are the preferred design to high velocity and high cycling applications.
Quarter turn
spindles also give advantages on these duties, e.g. time to open valve can
be minimised, thus limiting time seats are exposed to high velocities. Also,
live loaded stem seals would have longer life than the glands employed on
linear valves such as gate, globe or parallel slide.
Valves are manufactured in the UK, to order.
Ability to provide any face to face dimension, to preclude need for pipework alteration is possible. Also, weld ended valves are available.
A very wide range of body materials is available, including all the chrome/moly steels such as F9, F11 and F22.
Pressure classes from ANSI 150 to ANSI 4500, sizes 15mm to 450mm.
The lead time is only 8 working weeks, but shorter deliveries
are possible.
Chase International
Banksia House, Mill Lane,
Heatley, Lymm, Cheshire. WA13 9SG
United Kingdom
