The Piper

25mm Varie VL Pressure Reducing ValveThe VL is used where lower outlet pressures are needed. This need arises mostly when PRV is to be installed some floors above the point of use. Or When the no. of branches connected to the PRV are higher. Or, Also when commitment for water conservation is higher ( the environmentalist's choice) and internal fittings can work on pressures as low as 0.5 bar are used. ( many fittings and showers work well at 0.5 bar too.

Introduction :

The VL is a Direct acting, Balanced seat design, Diaphragm operated PRV with built in filter as per european norms. 

Application :

Pressure Reducing Valves protect household water installations for industrial or commercial applications within the range of their specification. By installing a pressure reducing valve, pressurisation damage is avoided and water consumption is reduced. The set pressure is also maintained constant even when there is wide inlet pressure fluctuation. Reduction of the operating pressure and maintaining it at a constant level minimizes flow noise in the installation. The VL is specialy designed for lower outlet pressure without compromising on the flow rate. These are especially used when more then 4 branches are drawn from one downtake line and the last branch tPRends to get very high pressure in spite of using a V.
 
Method of Operation :
Spring loaded pressure reducing valves operate by means of a force equalising system. The force of a diaphragm operates against the force of an adjustment spring. If the outlet pressure & therefore diaphragm force fall because water is drawn, the then greater force of the spring causes the valve to open. The outlet pressure then increases until the force between the diaphragm & the spring are equal again. The inlet pressure has no influence in either opening or closing of the valve. Because of this, inlet pressure fluctuation does not influence the outlet pressure.
Salient Features :

• Built-in filter to prevent dirt particles from reaching internals thus avoiding static pressure failures.

• Since the prv is Diaphragm operated it has better pressure control ,less noise and maintenance compared to the older piston operated PRVs.
• Moreover, Diaphragm is thin walled , corrugation shaped for better flexibility & smoother operation. Increased surface area of diaphragm reduces overall size of PRV. i.e. compactness.
• Nylon reinforced NBR Diaphragm for better strength and longer life.
• Transparent filter cap which shows dirt accumulated on filter. (currently in 15 & 20mm size only)
• Easy clean attachment (optional) helps flush out all dirt particles collected on filter at mere turn of a knob. No need to open the valve for cleaning. No downtime. No technician.
• Moving parts are of low weight engineering plastic (with metal insert) to ensure quick response time to changes in inlet pressure or flow conditions thus reducing noise levels significantly and give smoother pressure control.
• ‘Cartridge’ design internals - entire working mechanism is in a cartridge which operates independent of the body. Thus, servicing is without removing body from pipeline.
• The valve cartridge is of high quality synthetic material and can be fully exchanged.
• ‘Dual open’ design. Filter can be opened and cleaned from other side without disturbing pressure settings or removing working mechanism (cartridge).
• In-built provision for inserting pressure gauge.
• Inlet pressure balancing - Fluctuating inlet pressure does not influence outlet pressure.
• Light weight.

• Stainless steel spring & spring plate and powder coated Gun Metal / Bronze body (optional) for rust free, corrosion free, dezincification free valve for longer life.