Pressure Reducing Landing Valve, Flanged Inlet
PRODUCT DESCRIPTION
NAFFCO pressure reducing oblique landing valves are
suitable for installation on wet risers in buildings for fire
fighting purposes, permanently charged with water from a
pressurised supply.
These landing valves are pressure reducing type designed to
provide a range of outlet pressure (4 bar - 7 bar). The Landing
valves are classified under high pressure and are suitable for
use at nominal inlet pressure up to 20 bar.
• BSI Kitemark approved.
• Body material made of copper alloy to EN 1982.
• Hand wheel material made of grey cast iron to BS EN 1561.
• Blank cap material made of copper alloy to EN 1982.
• Possible to replace the gland seal when under pressure
with the valve fully closed.
SPECIFICATIONS
|
Model Number |
NWR 120 |
NWR 122 |
|
Valve Type |
Oblique, Pressure Reducing, Flanged Inlet |
|
|
Pressure Rating |
High Pressure Valve |
|
|
Inlet Flange Size |
DN50 |
DN65 |
|
Working Pressure |
20 bar Maximum |
|
|
Test Pressure |
Valve Seat Test at 22 bar • Body Test at 30 bar |
|
|
Flange Drilling |
BS4504 part 2: 1974 Table: 16/21 |
BS4504 part 2: 1974 Table: 25/21 |
|
Min. Water Flow Rate |
8.5 L/S @ 4.5 bar Outlet Pressure |
|
|
Min. Valve Pressure Regulating |
4 - 7 bar |
|
BILL OF MATERIAL
|
Sl.No. |
Description |
Material |
|
1 |
Handwheel |
Grey Cast Iron to BS EN1561 |
|
2 |
Stem |
Copper Alloy to BS EN 12164 |
|
3 |
Bonnet |
Copper Alloy to EN 1982 |
|
4 |
Body |
Copper Alloy to EN 1982 |
|
5 |
Female Inst. Outlet |
Copper Alloy to EN 1982 |
|
6 |
Blank Cap |
Copper Alloy to EN 1982 |
|
7 |
Renewable Disk Facing |
Rubber to BS 1154 |
|
8 |
Washer |
Rubber to BS 1154 |
|
9 |
Gland Seal |
Rubber to BS 1154 |
|
10 |
Bonnet Seal |
Teflon |
|
11 |
Gland |
Copper Alloy to EN 1982 |
|
12 |
Strap with Pad Lock |
Strap-Leather (12 mm Wide, 2 mm Thick) LOCK-Non-Ferrous |
