Boss Pressure Reducing Valve 15mm to 54mm

A Boss Pressure Reducing Valve sits on the incoming water main and cuts the pressure down to a set figure. However much the street pressure swings, the outlet side stays steady.

Why fit a Boss Pressure Reducing Valve

High or changing mains pressure causes banging pipes, dripping taps, noisy cisterns and strain on appliances. Some showers, boilers and cylinders also need the supply kept below a certain figure. A reducing valve sorts that out at the point of entry, so everything after it sees the same pressure. The outlet setting can be adjusted to suit the job.

• 15mm (1/2″), 22mm (3/4″) and 28mm (1″)
• 35mm (1.1/4″), 42mm (1.1/2″) and 54mm (2″)
• Adjustable outlet pressure
• Fitted on the cold mains after the stopcock

Flush the main before fitting, because grit can lodge in the seat. The arrow on the body should face into the property, with room left to reach the adjuster. Put an isolating valve either side if you can, so it can be serviced later. Check the appliance makers’ figures before you set it. For other makes and sizes, see Pressure Reducing Valves.

Pressure reducing valves in Glasgow

Plumb Parts, 555 South Street, Glasgow G14 0QX. Our counter is open Mon-Fri 8am-5pm and Sat-Sun 8am-1pm. Orders also go through online.

Specification

• Brand: Boss
• Sizes: 15mm (1/2″), 22mm (3/4″), 28mm (1″), 35mm (1.1/4″), 42mm (1.1/2″) and 54mm (2″)
• Suitable for: Reducing and steadying incoming cold mains pressure

Common Questions

What is a pressure reducing valve? It brings high incoming water pressure down to a steady, lower level for the system. The Boss valve takes up to 25 bar on the inlet and gives an adjustable 1 to 6 bar outlet.

How do I adjust the Boss pressure reducing valve? It comes preset at 3 bar and can be set anywhere from 1 to 6 bar. Fit a gauge on one of the 1/4″ BSP gauge ports so you can see the outlet pressure while you adjust it.

Can you clean a pressure reducing valve? Yes, the Boss valve is designed to be fully serviceable and has a built-in stainless mesh strainer that catches debris, which can be cleaned out.

Do I need a pressure reducing valve? If your incoming mains pressure is higher than your taps, appliances or system are happy with, a PRV protects them. Put a pressure gauge on an outside tap to see what you’ve got before deciding.

What size pressure reducing valve do I need? Match it to the pipe it goes on. The Boss valve comes in 15mm to 54mm, with the matching BSP sizes from 1/2″ to 2″.

How do I install the Boss pressure reducing valve? It can go in more than one orientation, which makes it easier to fit. Leave room to get at the gauge ports and strainer, and isolating valves either side make servicing easier later.