RWC 315i Installation And Maintenance Instructions Download Page 2

Reliance Worldwide Corporation 

(UK) Ltd.

Reliance Worldwide Corporation (UK) Ltd are part of the 

Australian based group of companies collectively known as 

Reliance Worldwide Corporation, with the UK brand known 

as Reliance Water Controls.
Reliance Worldwide Corporation (UK) Ltd is a specialist 

in the design, distribution and technical support for 

temperature and flow controls.
With group offices and manufacturing plants throughout 

the world RWC offers a wealth of knowledge and expertise 

which is reflected throughout our products. Being part of 

many specialised trade associations and having our own 

UKAS accredited laboratory, makes us at the forefront of 

any new regulations or changes which impact the industry, 

and allows for continuous product development and 

innovation, within our specialised product area.

General Function

The 315i pressure reducing valve is predominantly used 

in commercial installations for protection against excess 

supply pressure. The pressure reducing valve will protect 

water systems from fluctuating mains supplies, which can 

potentially cause damage to any plumbing system. The 

valves are 'drop tight' therefore they will not allow the 

pressure to increase (creep) under no flow conditions.

Installation

Please ensure you do not put the valve under any undue 

stress in the pipe work. 
Install the 315i pressure reducing valve into your pipe work,  

it can be installed in any orientation as long as the flow is 

in the correct direction, this is indicated by the arrow on the 

base of the valve. 
The minimum pipe length downstream of the PRV, before 

any elbow is fitted must be no less than 5 times the pipe 

work size.  Eg. DN25 would equal 5" distance. This is to 

protect against noise and to ensure a laminar flow.

Maintenance

To service the integral strainer:

1.  Isolate the water 

upstream and 

downstream of the 

pressure reducing 

valve

2.  Use a spanner 

on the base of 

the cartridge 

to unscrew it. 

Once loose, you 

can remove the 

cartridge from the brass body.

3.  The strainer can be found at the base of the cartridge, 

it can easily be removed by sliding it off the end of the 

cartridge 

4.  Rinse the strainer 

under clean 

running water, until 

any debris has 

been washed away

5.  Replace the 

strainer onto the 

end of the cartridge

6.  Re-insert the 

pressure reducing 

valve cartridge into 

the brass body

7.  Using a spanner, screw the cartridge back into the 

valve body.

Commissioning

Please Note: The valve 

should only be adjusted when 

under no flow conditions.
To adjust and set the 

pressure on the valve:
1. Loosen the securing 

screw on top of the pressure 

reducing valve cartridge 

2. Twist the cap anti-

clockwise to decrease 

the pressure down to it's 

minimum setting   

                       

3. Open a tap downstream 

of the pressure reducing 

valve to relieve the excess 

pressure for a couple of 

seconds.
4. Twist the cap clockwise 

to increase the pressure to 

the desired setting 
5. The pressure indicator 

on the side of the cartridge 

will show the set pressure, 

but alternatively you may fit 

a ¼" pressure gauge to the 

test ports on the base of 

the valve. 

6. Re-tighten the securing 

screw on the top of the 

cartridge.

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