Tungsten Carbide Adjustable Choke Valve Stem

Product Description

The core component is the tungsten carbide adjustable throttle valve stem. This is a key and high-value component in the oil and gas industry, especially in high-pressure wellhead control and oil and gas extraction. It represents the combination of materials and precision engineering in extreme environments.

• Adjustable throttle valve: used to control the flow and pressure of fluids (oil, gas, water, sand mixture) produced from oil or gas wells. By adjusting the size of the internal opening of the valve, the “throttling” effect can be achieved.
• Valve stem: It is a key transmission component that connects the external operating handwheel with the internal valve core. Rotate or lift the valve stem to directly drive the valve core to move and change the throttle opening.

This choke valve stem supports precise flow regulation and is compatible with wellhead equipment meeting the API 6A standard. The working pressure covers 2000-15,000 PSI and the temperature range is from -18 °C to 121°C. The integrated design of its tungsten carbide tip and stainless steel base effectively resists cavitation, flash evaporation and mechanical stress under high pressure difference conditions, and is suitable for throttling control in fields such as oil and gas extraction, chemical industry and coal chemical industry.

Key Features and Benefits

The wellhead fluid conditions are extremely harsh and are known as the “king of wear and tear”:

• Extreme high pressure: up to 10000 psi (69 MPa) or even higher.
• High flow velocity: When the fluid passes through a narrow orifice, the velocity is extremely high.
• Abrasive medium: The fluid contains hard solids such as formation sand, rock particles, and drill cuttings.
• Corrosivity: May contain CO₂ (acidic gas), H₂S (highly toxic hydrogen sulfide), chloride ions, formation water, etc.
• High pressure cavitation: When the fluid pressure drops sharply at the orifice, cavitation bubbles are easily generated, which can cause microscopic impact and erosion on the metal surface when ruptured.

In this environment, ordinary alloy steel valve stems will quickly be eroded, worn, and pulled, resulting in:

• Sealing failure leads to external leakage (environmental hazards and safety risks).
• Stuck and unable to adjust.
• Control failure, affecting production and well control safety.

Tungsten carbide, with its extremely high hardness and good corrosion resistance, can resist particle erosion and cavitation erosion, making it one of the few materials that can work reliably for a long time under such working conditions.

Specification of Tungsten Carbide Adjustable Choke Valve Stem

Material Name	Tungsten carbide
WC%	85-91
Co%	9-15
Grain size	coarse grain ,4-8 microns or thicker
HRA	89.5-91
Bending Strength	≥2300 N/mm
Dimension	According to drawing
Surface	Grinding

Typical Applications

1. Oil and gas wellhead throttle valve: the most important application. Used to control the production and pressure of a single well or manifold.
2. Oil testing/throttle valve testing: Control the release of high-pressure fluid during formation testing after drilling is completed.
3. Fracturing manifold throttle valve: used in fracturing operations to control the backflow fluid.
4. High pressure differential regulating valve: Any industrial application that requires control of high-pressure fluids containing solid particles, such as coal chemical industry and slurry transportation.

Why choose our Adjustable Choke Valve Stem?