Doppelplatten-Leitrohrsch.Double Disc Through-Conduit-Type Valves直通管线双闸板阀Двухдисковые полнопроходные задвижки
ProductsPetrochemical and Refining IndustriesDouble Disc Through-Conduit-Type Valves
Update time: 17.11.2009

Double Disc Through-Conduit-Type Valves

Double Disc Through-Conduit-Type Valves

Design features

  • Flat or round body valve design
  • Mounting options: flanges or welding ends
  • With reduced or full-bore passage
  • One-piece valve body with cleaning cover and connections for purge medium
  • Smooth tubular passage in the open position (valve body free of solid particles)
  • Can be installed in any orientation
  • Designed to customer specifications and German or international standards
  • Accommodates any desired type of actuator
  • Materials selected to suit operating conditions
  • Operating temperature up to 700 °C, without cooling or refractory lining
  • Nominal diameters up to DN 1400 mm
  • Specially developed technique for crackfree hard-surfacing of the seats of even large diameter valves ensures long-term maintenance-free service

Advantages of this design type

  • 3-year warranty period (maintenance-free) for installation in ethylene units
  • Low wearing (even when frequently actuated) due to hardsurfaced seats
  • Double Block & Purge Design
  • Body internal space tight against solid particles when in open position due to expansion bellow device with double sealing
  • During valve operation the internal body space remains free of particles because of installed guide plates
  • Perfect actuation and tightness even under extreme operating conditions
  • Suitable for media with extremely high solid-particle content
  • No jamming even under extreme temperature changes
  • No jamming due to forces and moments resulting out of the piping system (calculation by finite element analysis during valve layout) incorporates such forces and moments
  • Force release of the discs prior to opening  the valve (minimized wear)
  • Central sealing force due to ball-wedge mechanism
  • Seats continuously covered in the end position, thus preventing deposit build-up on the seat surfaces

Operating conditions

  • High temperatures
  • Temperature changes
  • Differential temperatures
  • Forces and moments resulting from piping
  • Frequent actuations
  • Quick closing
  • High differential pressures

Typical applications

  • Main transfer and decoking lines of ethylene units
  • Fluidized catalytic cracking units (in overhead vapor and fractionator bottom lines)
  • Coal gasification units
  • Visbreaker units
  • Epichlorhydrin units


  • Suitable for gases and fluids with high solid-particle content