Needle Valve

Needle Valve


A valve is a module, which is able to control or regulate the flow in a pipeline by obstructing the flow within the pipe either completely or partially. There are different types of valves; each is designed to be utilized in different applications.

Uses and application

This valve is designed with a small port having a threaded needle similar to a plunger. This allows for precise regulation of the flow. They are utilized to check the flow of substances namely gas or water across, the system. These components are widely used in several applications, which feature carburetors. They are also seen in various water heaters, which help in regulating pressure in different devices. This helps to keep a check on the efficiency and ensures optimum usage in the system. In certain cases, they are also seen in vacuum systems to control the supply of gases through the elements.

The function

These components are designed to accurately control the rate of flow of clean gasses and fluids. The adjustments within the system are smooth, gradual and can act as a highly reliable shut down valve. They are widely used in regulating low-pressure rates. These components exhibit a larger pressure drop from the inlet back to the outlet. Their common port sizes range between 1/8 to 2mm.

How does a needle valve control flow?

These components can be operated either manually or automatically. A manually operated element can be operated using a hand wheel, which helps in controlling the distance from the plunger back to the valve seat. This system allows the passage of fluids to be opened and closed easily. An automated system is connected to the air actuator or a hydraulic motor. This facilitates the opening and closing of the valve. The motors or actuators will adjust their position based on timers or the external performance of the element. Both these modules help in maintaining a precise and controlled flow rate within the system.

How do you tell if a needle valve is open or closed?

These valves open and close due to an orifice, which has a tapered end. This handle raises and lowers the element. In a manual system when the handwheel is turned in a direction, the plunger is lifted and the fluid is allowed to pass through it. It is closed by turning it in the other direction. For automatic systems, the motors lift the valve based on set timers or by checking the external performance of the machinery.

Which way do you turn a needle valve?

The valves in this range are bi-directional which, allows them to be rotated in any direction to control the flow characteristics. A threaded stem allows the movement of the fluid through the valve in different directions.

How to choose?

These components are highly reliable and used across various systems. The selection of these valves is an important criterion, which will help in enhancing the performance of the entire system. Below are some of the criteria required for selecting the best modules.

  • Pressure- The working pressure in the system is an important factor while selecting the best components. Normal robust components can handle 275-413 bar of pressures at 38 degrees C. High-performance items can handle pressures up to 639 bar at temperatures of 100 degrees F.
  • Sizes- Selecting the right size is very, essential to have optimum performance. These items are available in sizes between 2mm to 12mm,
  • Temperature- Each valve can operate at different temperatures. They are coated with a special material, which allows them to suffice in various temperatures.
  • Material- The items in this range are produced using different types of material. Stainless, carbon steel, brass, and alloy 400 are commonly used products in their production. Using the right components will help the system operate smoothly.

How to install?

Installing these components is a simple process. Below are a few steps to follow during the installation process.

  • Use a pipe, which is close to the appliance, which requires the supply of water.
  • Shut off the main water supply valve. It is common for 2 valves to start leaking if not used for long periods.
  • Open the faucet located below the saddle valve installation. This will help in lowering the pressure within the system.
  • Clean and paint the section of the pipe where the gasket of the component will be placed. This will help against corrosion and leakage.
  • Attach the clamp of the top section to the valve and make it tight. Check for any defects in it.
  • Place the gasket around the piercing pin of the valve. The shape of the gasket will fit the curve easily.
  • Attach the bottom to the top clamp and bolt it.
  • Drill a hole prescribed by the manufacturer to fit the valve.
  • Place and secure the needle valve.

Is a needle valve directional?

No, they can be easily moved in any direction to control the characteristics of the flow.