Double Block and Bleed Valves

Products: Double Block and Bleed Valves

Standard Design

Our Double Block and Bleed Valves comply with ASME, ANSI and API standards. The advanced features incorporated onto our range of floating and trunnion ball valves are also designed into these double block and bleed valves. These features are requirements by end users such as Petrobras, Aramco, BP and Pemex – which includes ISO 15848-1,2 fugitive emission tests.

We carry out NDT tests on sample castings per batch to ensure high quality castings for our “right first time” production philosophy.


Product design features

  • Ball - Floating Ball or Trunnion Mounted. Choice of bleed valve.
  • Gate Type - Stelited Seats. Choice of bleed valve.
  • Sealing options including additional graphite, O-rings and/or lip seals.
  • Seating options including PTFE, PEEK and metal seated.
  • Seating options including Devlon, Nylon, PTFE, PEEK, PCTFE and TCC metal seated.

Production range

  • 1-1/2” to 8”
  • 150lb to 2500lb
  • Full and Reduced bore
  • Manual and Actuated
  • Ball Needle Ball
  • Gate Needle Gate

Material scope

Statoil approved QTR qualified to NORSOK M650 edition IV.

  • Carbon and Low Temperature Carbon Steel
  • Austenitic and Super Austenitic Stainless Steels
  • Duplex and Super Duplex
  • Nickel alloys and Super alloys eg 6Mo, Hastelloy, Inconel and Monel.

All from high quality forgings & castings. Other material combinations available against specific requirements.

Options

  • Metal Seated Ball valves with Tungsten Carbide Coating (TCC) on the seat and ball
  • Inconel overlay seat pockets
  • Hot Dipped Galvanised Bolting (HDG)

Features & benefits

Benefits

Our DBB valve design can be effectively used in critical applications like instrument take-offs, sampling systems, chemical injection and severe applications like sour service where the material compliance to NACE MR-0175 is assured.

Body Design

Our design is built to be suitable as standard for most customer specifications in terms of corrosion allowance requirement.

Body Sealing Design

Body seal design is modular. Therefore, we are able to meet our customers body sealing specifications including lip seals and other sealing options. Body seals feature O-ring plus graphite as standard rather than O-ring or graphite only.


Design features

Design Options

Our DBB valve can be manufactured in different variations. Whilst maintaining the main blockage device as a ball, the bleed device can be designed to suit customer requirement with needle, gate, and globe options available.

Design Standards

The DBB valve can be manufactured in both Floating and Trunnion types, exotic materials and any combination of end connections.

Engineered Seats

Compensate for wear and pressures to prolong sealing life. Seat is thicker and seated deeper in the valve.

Self Relieving Seats

With double block and bleed.

Sealant Injection

Optional sealant injection system.

Stem Design

Stronger stem, meaning a higher MAST value, with no impact on break torques. The stem slot into ball is deeper and slightly curved which gives better control of ball and reduced risk of shearing. Our stem design incorporates a tamper proof antistatic device and is blowout proof.

Stem Sealing Design

The stem O-ring is located in the body which reduces the friction on the sealing area and so improves performance and provides a long cycle life as demonstrated by our Fugitive Emissions Testing. The stem seal design also features live loaded packing.

Actuation Ready Design

Large ISO plate and plate design reduces the time and cost of actuation. Uniform torques provide prolonged cyclic life.

Locking Devices

Standard on lever and gear operated valves.

Testing

We test to API 6D, API 598/EN 12266-1. Fugitive Emission Testing to ISO-15848-1,2. Fire safe to API 607/EN ISO 10497. All tested in-house.


Project Experience


Certifications