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ESPERO Piston valves


Espero piston valves have been used in high-temperature, high-pressure chemical plants, such as ammonia plants and synthetic resin plants, and petrochemical plants, for many years. In addition to standard type valves, Y-shaped valves, high-pressure valves and discharge valves are available. You can select the valve according to the application.

  • Espero piston valves have a mechanism for sealing fluid by contact pressure (pressure acting on contact surfaces of parts) between the cylindrical piston (valve disc) and the valve body and the elastic ring packing.
  • When long-term use results in the reduction of contact pressure between the cylindrical piston and the valve body and the ring packing, leading to the occurrence of valve seat leakage, simple tightening work of the ring packing can adjust the contact pressure and recover sealing performance, enabling continuous use.
  • Valve maintenance is performed only by the replacement of the ring packing even if the valve is installed in piping. The ring packing can be selected from several types according to the specifications.
  • Valves for high-pressure fluid and large piping are applied with construction for adopting a unique fluid pressure balance mechanism to reduce valve opening and closing force by decreasing the effect of the fluid pressure acting on the piston. A valve for extra-high-pressure fluid in which the ring packing is protected by metal parts in four places at the full opening of the valve to prevent damage and deformation of the ring packing is available as a special type.
  • Espero piston valves with position valve seat construction do not generate shock force at full closing and are suitable for automatic operation by hydraulic, pneumatic, and electric power, differing from torque seat construction that closes the valve by strongly pressing the valve disc onto the valve seat like ordinary globe valves.