FunctionThe SYR Adjustable Pressure Reducing Valve is used for reducing pressure in water, fuel oil, compressed air, neutral non-sticking liquids and neutral gases. It is however mainly used for domestic water supply systems. The size of the valve is determined by the required flow rate and / or the number of dwellings |
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OperationThe pressure reducing valve is set at the factory to an outlet pressure of 400kPa thus eliminating, in most cases, the need for further adjustment on site. If for technical reasons a different outlet pressure is required, then shut of the supply to the valve, discharge the pressure from the system on the outlet side, then close it. Slacken the set screw and then remove the tension from the spring by turning the adjusting knob anti-clockwise. Now slowly open the supply line to the valve. The desired outlet pressure can now be set by turning the adjusting knob clockwise, check the pressure gauge for several minutes in order to be sure that the outlet pressure does not rise above the desired setting. Then open any tap and the outlet pressure will fall below the set pressure. The amount of pressure drop will depend on the flow rate taken from the system. Lock the valve at the set pressure by tightening the set screw. Main featuresSYR312 (DN15, 20) - female connections Installation The valve must be free from tension when fitted. The direction of flow is indicated by an arrow, the inlet and outlet pipes should run in a straight line for a distance of at least 7 times their nominal diameter. The pipe system should be thoroughly clean prior to fitting the valve - flush the system if possible. If any part of the system on the outlet side of the valve is sensitive to pressure, then it must be protected by a suitable safety valve. The outlet pressure must then be set to a value, which is at least 20% below the set pressure of the safety valve. If a pressure gauge is fitted to control the outlet pressure, its full-scale range must be at least 30% higher than the desired outlet pressure setting. The cartridge assembly screws directly into the top of the body and remains fully accessible, allowing in-line serviceability. The cartridge assembly houses the main seat, seal, spindle, strainer and diaphragm. The removable strainer is mounted around the outside of the cartridge body. This protects the valve from ingress of dirt, which could cause a malfunction. Except for sizes DN25 and DN32, all valves feature a single cartridge, allowing the whole reducing and adjusting mechanism to be removed in one piece. When the cartridge is re-fitted to the body, the setting remains unaltered. (DN25 and DN32 each have two cartridge cases) Maintenance and trouble shooting Under normal conditions, the SYR pressure reducing valve does not require any special maintenance. However, if the valves outlet pressure increases to the same level as its inlet pressure, it will be because the valve seat has become clogged. To rectify this, it will be necessary to clean the strainer, which is easily accessible (in line) by removing the cartridge. Where the valves outlet pressure rises ABOVE its set pressure, this may be the result of a cross-connection with an unregulated supply, e.g., where two supply lines are connected by a mixing valve with no non-return valve fitted.
Materials 31215 - Body 15mm BS ref CZ122 (ISO refCuZn39Pb2As)
ApprovalsUnited Kingdom - UK WFBS No. 8602011 WRC Cert. No. 9306017 |
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