Piston Valves

• Steam
• Main steam isolation valves on Steam header
• Brine
• Thermic Fluid Supply, Return & Balancing Line Isolation
• Pressure Reducing Stations
• Steam Trap isolation valves
• Steam Manifolds
• Air/Nitrogen
• Hot Water
• Condensate

• Tight Shut Off - The valve has a reliable seal between burnished piston and graphite seal. Leakage class VI (Bubble tight shut-off)
• No leakage from gland packing area - because of glandless design.
• Larger sealing area than globe & bellows-sealed valves.
• Slow Opening - This helps to stop water hammer. The valve has a cage unit fitted in which the piston moves, creating a variable orifice by degree as opposed to simply ‘open or closed’. Therefore, perfect for steam.
• In-line Maintenance - The replacement of the piston rings can be carried out in-line by removing the yoke, leaving the body seals and cage in-line. The top seal is removed, the cage unit taken out, the bottom seal removed and new seats simply installed in reverse order.
• No Leaks To The Atmosphere - Because the top ring has the same leakage classification as the bottom ring the chances of leakage are as good as or better than globe & bellows-sealed valves.
• Not Affected By Flow Direction - The valve can therefore be used under or over the piston. However we generally advise that the flow be used under the piston to assist with opening.
  

• Forged Steel Construction: #800 as per ASME B16.34
• Cast Steel Construction: #150, #300 as per ASME B16.34

Face to Face Std.

• Forged Steel Construction: #800 as per Manufacturer's Standard
• Cast Steel Construction: #150, #300 as per ASME B16.10

• 15mm (1/2") To 40mm (1 1/2") Forged Steel Construction: #800 
• 15mm (1/2") To 200mm (8") Cast Steel Construction: #150 / #300