1. Gate, Globe & Check
  2. Control Valves
  3. Chokes
  4. Severe service Qtr. turn & rising stem ball valves

Chokes

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Today’s Oil & Gas harsh environment means higher wellhead pressures with aggressive fluids with entrained sand and other solid particles. A conventional single stage choke valve might not be suitable for this kind of service. The need to maintain production rates means that frequent choke repair or replacement is no longer acceptable.

HP faced this need developing its advanced severe service choke valve. The choke uses a combination of proven trim design to control flow velocity and to reduce noise and the best grades of tungsten carbide material used in the industry to provide long trim life and precise process control.

 

 

Typical Applications

HydroPneumatic choke valves are typically the perfect solution for:

  • Wellheads
  • Drilling
  • Water Injection
  • Blowdown
  • Production
  • Heater Bypass

 

Features

  • API 6A and ASME design
  • Positive, Rotative Disk, Needle, Plug & Cage, External Sleeve design
  • Pressure rating from ANSI 150 through API 15k Psi
  • Flanged from 1’’ through 16’’ ANSI (other ends connection available upon request)
  • Flanged from 1’’ 13/16 through 11’’ API (other ends connection available upon request)
  • Customized end to end dimensions
  • PSL 1-4
  • PR1-2
  • API 6FA
  • API material classes from AA through HH
  • API temperature classes from P/L through U
  • Material for H2S and CO2 service in accordance with NACE MR01-75 latest edition
  • Extensive Range of Body/Trim Materials
  • Forged bodies for maximum safety and reliability
  • Tungsten Carbide wear resistant Trim
  • Equipercentage, linear or modified characteristic
  • Actuation: Manual, single & double acting Pneumatic and Hydraulic,Stepping, Electric and Electro-hydraulic actuator

 

Benefits

  • One single piece body with integral flanges for long service life – no welding
  • Heavy duty design to withstand service life
  • Suitable for contaminated and corrosive fluids and high sand content
  • Resistant against high pressure drops
  • Flashing and cavitation resistance
  • Low noise design
  • High seat tightness
  • Fluid control with guaranteed fixed CV value
  • High calibration
  • Fire resistance
  • Easy maintenance design
  • Low life cycle costs

 

Materials

Component Component
Body AISI 4130
ASTM A350 LF2
ASTM A182
(Alloy & Stainless Steel, Duplex & Super Duplex)
Bonnet As above
Disk stack Solid tungsten carbide
Seat housing/insert 17-4PH/Solid tungsten carbide
Plug/Cage Solid tungsten carbide
Stem 17-4PH, AISI 410, Inconel 718
Seals PTFE, Viton, Graphite
Body to bonnet seal Buna, Viton, Metallic
Other materials available upon request

 

Options

  • Low noise trim design
  • Large capacity trim
  • Special flow characteristic
  • Filter cage for polluted fluids
  • Tungsten-carbide wear sleeve
  • Hammer union bonnet
  • Steam service design with Belleville springs to absorb thermal expansion
  • Fugitive emission design
  • Grafoil packing for high temperature
  • Packing gland for packing adjustment
  • Cladding on internal parts