|The pair of water filter valves (not a recent photo!)|
|Filter valve section drawing|
(from S-Type Waggon Parts Manual)
An unusual feature of the valve is that it has two seats (10). The obvious one closes the water inlet to the right; less obvious is the seat to the left which closes when the valve is fully opened. This is to stop the water from seeping out through the valve threads. I guess this is a simple, low-maintenance alternative to gland-packing the valve spindle.
The filter element and other component parts are shown below.
|Component parts showing the filter mesh|
|Drain plug shown highlighted|
However, Sentinel 6515, Isebrook, which usually lives at Quainton Road, has its filter valves inverted as in the photo below!
|Isebrook's inverted valves|
|... and the brand new replacement|