Piston Valve Guichon


No dead space, particularly suitable for high viscosity and polymerising fluids

DN 15 to DN 250

1/2" to 10"

PN 10 to PN 420 acc. to size

150 to 2500 Lbs acc. to DN



• Tank or reactor bottom outlet valve

• Feeding valve : side mounted or upright

• Sampling or injection valve : at tank bottom or laterally / on a section of piping

• Walls cleaning by spraying or streaming : installed on reactor dome

• In-line stop valve, no dead areas

Operating principle – Piston valve

– Shutter : Right Piston and polished (stellite in option)

– Process/Atmosphere sealing with stuffing box (repackable in service)

– Full bore

– Low pressure drop



Construction materials: : Carbon Steel (CS), Stainless Steel (SS), Duplex & Super Duplex, Titanium,

Zirconium, Uranus® B6, Tantalum, Nickel, Hastelloy®, Monel

Construction Methods : Fabricated (Welded), Cast



 • Service conditions : High pressure, High temperature, Low temperature, Abrasion, Corrosion, Vacuum

• Types of fluids : Liquids, Liquids with solid particles, gas, Powder and powdery media, High viscosity fluids

 • Applications : Fine chemicals, Plastics and polymers, General chemicals, Petrochemicals



DN 15 to DN 250

1/2" to 10"

PN 10 to PN 420 acc. to size

150 to 2500 Lbs acc. to DN

Sealing system

• Conical metal-to-metal piston seating

• Radial soft seating with packing, O’ring, etc.


Handwheel or crank according to size,handle + return spring (dead man handle),double

acting pneumatic actuator,single acting pneumatic actuator (acc. to DN, Class and/or stroke),

hydraulic actuator,electric actuator,air cylinder.

Closing device

piston with conical seating, straight piston



– adaptation to any type of connection

– contoured piston to match the tank or line profile (no dead area)

– crust breaking function

– hard faced seating surfaces according to media and/or pressure

– vacuum tight

– firesafe design

– heating jacket

– FDA grade gaskets and packings

– leak detector at stuffing box

– interchangeable seat

– inside and/or outside polishing

– additional draining and/or cleaning nozzles

– stroke limit or proximity switches

– manual override for pneumatic actuator

– dry air actuator

– stainless steel pneumatic actuator

– pneumatic actuator with stroke damper if trip time > 50 mm/s

– actuator locking system (safety)

– manual operator with locking mechanism

– chain handwheel

– manual operator extension, if required with cardans

– manual operator mounted on ISO base for later adaptation of actuator

– electric actuator with local/remote controls

CAUTION : some options are not compatible

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