Landing Valves & Dry Riser Gate Valves
The landing valves being used on dry rising mains, should normally be of the gate valve type, but globe pattern valves are occasionally used. Theses valves act as outlets from the rising main and are fitted in easily accessible positions such as stair wells on each floor above the first floor of a building, and can sometimes also be located in deep basement areas.
Dry Riser Gate Valves.
Here are some 2.5″ instantaneous female outlet to BS 336, blank cap and chain, strap and padlock. Dry riser gate valves have to comply with the requirements of BS 5041:Part 2. These valves can be mounted in the relevant boxes that complying with BS 5041:Part 4.
๏ Inlet flanged 2.5″ BSP or 3″ BS Table D or 65mm BS 4504 Table 16/21.
๏ Inlet screwed 2.5″ BSP.
Globe Pattern Landing Valves (LP).
These screw-down stop valves are primarily used as hydrant outlets on wet rising mains, occasionally these are used on dry risers, however these are under special circumstances and after discussion with the relevant fire brigade.
๏ Gunmetal bodies, major working parts in manganese bronze.
๏ Comply with the requirements of BS 504:Part 1 and BS 5154.
๏ Outlets are 2 1/2″ instantaneous female to BS 336 and inlets flanged or screwed as required.
๏ Accessories include blank caps and chain, straps and padlocks
Dry Riser Ancillaries.
In this picture is the anti-tamper leather strap used with globe valves and can be fastened using the 3/4″ brass padlock. Other accessories include a replacement washer and an air release valve for use at the top of a hydrant system.
Air Release Valves.
Air valves are fitted at the top of a riser to release air when the riser is charged with water or to admit air when draining off.
๏ Screwed 1″ BSP male.
Blank plugs are used to seal off water supplies and prevent dirt entering the valves or connectors. Blank plugs are 2 1/2″ instantaneous male type.
Gunmetal and aluminium blank plugs are pressure resistant; plastic and rubber blank caps act as dust cover only.
Dry riser inlet breechings are normally fitted in glass-fronted cabinets on the outside walls of buildings and have either two or four inlet connections. For special requirements, a single inlet breeching is available.
They are used to feed water into the rising main through 2 1/2″ fire hoses. A 100mm (4″) rising main uses a two-way inlet breeching and a 150mm (6″) main uses a four-way inlet breeching.
Drain Valves to BS 5154.
Normally fitted to inlet breechings but can be supplied separately.
Two-way Inlet Breechings.
4″ BSTD, 4″ BSP parallel female or 100mm NP16 Ð can be mounted either horizontally or vertically.