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Needle & Seat / Positive Choke Valve

Our MasterChoke H2 type profile is fully interchangeable with those of other manufactures of the same H2 type profile. This design is time-proven, and it has been employed in many service applications within the industry.

Chokes maybe ordered in either positive or adjustable models. Each model utilizes a hammer union type connection, which facilitates the quick change out of flow beans and trim, while the choke body remains installed in the line. This equates to less down time and more production time during trim change out.

Type H2 Positive & Adjustable Chokes

The MasterChoke line of chokes is ideally suited for a broad range of applications, including wellhead trees, production manifolds, choke and kill manifolds, flow back systems, clean-up operations and various injection systems.

Features & Benefits
  • Hammer Union Bonnets & Cap connections
  • Forged Steeled Bodies – Alloy and SS
  • Choice of end Connections
  • Available H2S Service (NACE MR-01-75) or Standard Service
  • Easily converted in the Field
  • Choice of Trim Materials
  • Choice of Orifice Sizes
  • Grease Fittings on Adjustable Bonnet Models
  • Thumb Screw for “Locking” Stem
  • Test Port on Flanged Models
  • OCT & H2 profile Centerline Dimensions
  • Easy-To-read Indicator in 64ths inches
  • Readily Available Parts
  • Low Maintenance
  • Special Dimensions Available
  • Stainless Steels Materials + Inconel inlay per request
  • API Monagramable
  • PR2 Qualified
  • Made in the USA
Specifications
Type: Positive & Adjustable
Body Design: Angle Type
End Connection: 1” LPT, 2” LPT, Flanged RTJ & RF Union Ends
Design Pressure: 2,000 PSI CWP
3,000 PSI CWP
5,000 PSI CWP
10,000 PSI CWP
15,000 PSI CWP
Trim Sizes: ½”, ¾”, 1”, 2”, and 3”
Trim Materials: Alloy Steel
Stellite
Stainless Steel
Inconel
Stainless Steel Tungsten Carbide
MasterChoke H2 Adjustable Choke

Adjustable Chokes – provide variable flow rates and are equipped with locking mechanisms for desired fixed flow rates.

Adjustable chokes can be field converted to Positive chokes once the desire flow rate is reached. Optional combination bean sizes are available for desired flow rates.

MasterChoke H2 Positive Choke

Positive Chokes – provides a fixed flow condition with an optional combination of available bean sizes.

Physical Specifications

Available Sizes and Pressures End Connections

Nominal Size Model Number Available Max. Orifice Sizes Pressure Rating (PSI) End Connections Angle Type
2” H2 1” 2,000 -10,000 2” LPT
RTJ and RF
Union Ends
2” H2 1” 15,000
3” H2 2” 2,000-10,000
4” H2 3” 2,000-5,000

Material Recommendations

API Material Class Body Bonnet Choke Trim (Stem, Seat, Bean)
AA & BB
General Service
Alloy Steel Alloy Steel Stainless Steel or Stainless Steel & Tungsten Carbide
CC
Non-Sour
High CO2
Stainless Steel Stainless Steel Stainless Steel or Stainless Steel & Tungsten Carbide
DD & EE – 0.5
Sour
Low CO2*
Alloy Steel Alloy Steel Stainless Steel & Tungsten Carbide
FF – 0.5
Sour
High CO2*
Stainless Steel Stainless Steel Stainless Steel & Tungsten Carbide
HH
High H2S
High CO2*
Corrosion Resistance Alloy Corrosion Resistance Alloy Corrosion Resistance Alloy & Tungsten Carbide

*In compliance with NACE Standards MR-01-05

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