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Piston Valve

CHECK VALVES
GUICHON VALVES manufactures various types of non return check valves, to meet the required operating conditions, leak rate and installation position (vertical or horizontal) :

• swing check (types 902 and 903)
• piston and spring loaded, axial or Y types (types 901, 903, 905)
• ball type (type 904).

Sealing surfaces can be metal-to-metal (stellited option) or soft seated (PTFE seal). All connection requirements can be met : lug or wafer type, flanged, BW, SW or tapered.
A number of optional arrangements are proposed :

• profiled axial disc with special, low friction design to allow closing under very low differential pressure and offer minimum pressure loss coefficient
• screwed or solid seats
• heating jacket
• PTFE or metal ball (stellite)

Materials
These valves can be made in welded or solid construction, in a large choice of steels and alloys.

Swing check valve
Type : 902, 922, 952

Ball type axial check valve
Type : 904, 924, 954

• DN 15 to 200 (1/2in. to 8 in.), PN 10 to 100 (class 150 to 600)
• Stainless and duplex steels, nickel alloys, special alloys (titanium, zirconium)

Spring type axial check valve
Type : 903, 923, 953

• DN 350 - Class 150
• Cracking pressure : 0,2 bar
• Profiled disc, very low pressure drop