1. 
   Pressure balanced valve
   A pressure balanced valve, required by building codes in some municipalities, provides water at nearly constant temperature to a shower or bathtub, despite pressure fluctuations in either the hot or cold supply lines. If, for example, someone flushes a toilet while the shower is in use, the fixture...
   Found op http://en.wikipedia.org/wiki/Pressure_balanced_valve
   
   
2. 
   Pressure Balancing Mixing Valve
   A pressure balancing compensatory shower mixer valve designed to maintain a constant shower temperature under variable inlet pressures but maintained inlet temperatures.
   Found op http://www.mirashowers.co.uk/glossary/landing.htm
   
   
3. 
   Pressure Balancing Valve
   Maintains a constant water temperature by using a mixing valve that balances incoming hot and cold water supplies. It is designed to maintain a constant shower temperature.
   Found op http://www.encyclo.co.uk/local/20844
   
   
4. 
   Pressure Balancing Mixing Valve
   A pressure balancing compensatory shower mixer valve designed to maintain a constant shower temperature under variable inlet pressures but maintained inlet temperatures.
   Found op http://www.mirashowers.co.uk/glossary/landing.htm
   
   
5. 
   PRESSURE BALANCE VALVE
   A shower mixing valve that automatically maintains balance between incoming hot and cold water supplies by immediately regulating fluctuatuions in pressure. As a result the outlet temperature remains constant, though the outlet pressure may drop.
   Found op http://www.tjader.com/glossary.html
   
   
6. 
   PRESSURE REDUCING VALVE
   Valve installed in the water service line where it enters the building to reduce the pressure of water in the line to an acceptable pressure used in buildings (40-55 psi desired).
   Found op http://www.proofrock.com/glossary.html
   
   
7. 
   pressure relief valve
   a valve that opens at a preset pressure to relieve excessive pressures within a vessel or line. Also called a pop valve, relief valve, safety valve, or safety relief valve.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
8. 
   Pressure Relief Valve
   Spring loaded relief valve fitted to cold supply on unvented systems to relieve excess pressure safely to atmosphere.
   Found op http://www.mirashowers.co.uk/glossary/landing.htm
   
   
9. 
   Pressure Relief Valve
   Spring loaded relief valve fitted to cold supply on unvented systems to relieve excess pressure safely to atmosphere.
   Found op http://www.mirashowers.co.uk/glossary/landing.htm
   
   
10. 
    PRESSURE RELIEF VALVE
    Valve to relieve excess pressure in water storage tanks.
    Found op http://www.proofrock.com/glossary.html
    
    
11. 
    Pressure Relief Valve
    A device mounted on a hot water heater or boiler which is designed to release any high steam pressure in the tank and thus prevent tank explosions.
    Found op http://www.soundhome.com/glossary
    
    
12. 
    Pressure-Reducing Valve
    Valve installed in the water service line where it enters the building to reduce the pressure of water in the line to an acceptable pressure used in buildings (40-55 psi desired).
    Found op http://www.rookinspections.com/glossary/glossaryp.shtml
    
    
13. 
    Pressure-Relief Valve
    Valve to relieve excess pressure in water storage tanks.
    Found op http://www.rookinspections.com/glossary/glossaryp.shtml
    
    

Tip: double click on a word to show its meaning.