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Contents are subject to change without notice.
SKW/ SKF-2015-09-ENG
2.2
General description
2.2.1
Principle of operation
Flowrox SKW and SKF valves are built with a cast or welded body and feature a heavy-duty
stainless steel gate as a standard structure. Removable ring sleeves on both sides of the gate
provide a bi-directional bubble tight seal.
In the open position the two ring sleeves seal against each other in the centre of the valve,
providing a full bore through which the medium can travel. Main components are shown in
Figure 1. Closing the valve forces the gate progressively down between the two mating ring
sleeves, until it reaches the fully closed position. When the valve is fully closed, the ring
sleeves push against both sides of the gate, effectively sealing and completely containing the
line pressure. Any medium discharged between the ring sleeves during open/close strokes is
collected to the valve body cavity and drained or flushed trough the flushing ports.
The secondary seal is built in the upper part of the body. On every valve stroke, it wipes the
gate and lubricates it with silicone grease. Easier actuation and minimum wear are achieved.
There is no need to remove the valve from the line when replacing the secondary seal, but in
tight or unsafe conditions it is unavoidable.
Figure 1. Valve main components.
No.
Description
No.
Description
1
Valve body
7
Secondary seal
2
Gate
9
Protective plug (on flushing port)
3
Tower
12
Bottom cover plate
4
Ring sleeve
A
Valve body cavity
