Steel 555 valve


The Series 555S Steel Softseal Valve is a double-faced, resilient seat, internal screw, clear bore wedge gate valve. Designed primarily for the isolation of high pressure natural gas, fitting into steel pipelines.

Steel 555 valve features

  • Clear bore.
  • Full double block and bleed with pressure relieving plug.
  • Double ‘O’ ring stem seal.
  • Soft seal positive shut off.
  • Metal to metal secondary seal.
  • Maintenance free.
  • Suitable for under pressure drilling.
  • Suitable for above and below ground use.
  • Suitable for end of line service.
  • Integral lifting lugs on all sizes.
  • Kitemark approved to GIS/V7 Part 1.

Steel 555 valve options

  • False cap.
  • Indicator.
  • Handwheel.
  • Bare shaft end.
  • Street access down pipe adaptor to provide a cost effective solution for underground installations.


  • Maximum Working Pressure: PN16 rated to 16 bar
  • ASA Class 150 rated to 275 psig (19 Bar).
  • 7 Bar Double block and bleed
  • Temperature Range: -20°C to +60°C.
  • Fluids for Standard Valve: Natural Gas.
  • Fluids for Optional Valve: Manufactured gas (Viton ‘O’ rings).

Materials of construction

  1. Body Cast steel, EN10204 GP240GH
  2. Bonnet Cast steel to EN10204 GP240GH
  3. Gland Cast steel to EN10204 GP240GH, ASTM A216 WCB.
  4. Wedge Gate Ductile iron to EN1563-GJS-450-10
  5. Spindle Standard: Carbon steel to EN10087, 11SMn30/1.0715/230M07/ENIA Option: Stainless steel to EN10088 X8CrNiS8-9/1.4305/ 303S31/ EN58M
  6. ‘O’ Ring Seals Standard: Nitrile rubber. EN 682. Type GBL Option: Viton rubber
  7. Fastenings HTS Gr8.8
Valve sizeDimensions (A1 x B1mm)Weight (Kgs)No. of turns to close
DN50178 x 280229
DN80203 x 2852314
DN100229 x 3003415
DN150269 x 3965814.5
DN200292 x 4808719.5
DN250330 x 60715224
DN300356 x 69730028
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