NEEDIE VALVES AND COCKS Manufacturers

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Needle valve and Cock Valve structure and performance analysis
1. Needle valve: ideal choice for high-precision flow regulation
The needle valve is a precision control valve used to finely adjust the fluid flow. Although its structure is compact, it has high adjustment accuracy and is particularly suitable for occasions that require small flow control, such as pressure instrument testing, liquid metering, gas pipelines and other systems.
Core structural features: The valve core is a conical needle structure. By rotating the handwheel to drive the valve stem up and down, the gap between the needle tip and the valve seat can be finely controlled to achieve micro-adjustment; the key component materials are mostly made of high-strength copper alloy, stainless steel or aluminum alloy, with excellent corrosion resistance and high temperature stability; to ensure sealing performance, the valve core and the valve seat are precision ground and polished to ensure that the contact surface is smooth and flat; the seals are mostly PTFE or metal hard seal design, which can maintain stable operation under high pressure and high temperature conditions.

2. Cock Valve: an efficient tool for rapid cutting and opening and closing
The Cock Valve is a valve that uses a rotating sphere to achieve opening and closing control. It has a relatively simple structure and is mainly used for rapid opening and closing of fluids. By rotating the ball, the through hole in it is aligned or perpendicular to the pipe to achieve the open or closed state.
Core structural features: The internal ball is precisely processed and has high hardness. It is usually made of stainless steel or aluminum alloy to prevent wear caused by long-term friction; the main sealing interface between the ball and the valve seat requires close contact and smooth fit to ensure zero leakage sealing effect; the opening and closing operation usually only requires 90° rotation, which greatly improves the control response speed and is suitable for high-frequency opening and closing occasions; the sealing materials are mostly PTFE, POM and other chemical corrosion-resistant and high-temperature resistant polymer materials to extend the service life.

Manufacturing process commonality and technical requirements
Although the needle valve emphasizes the adjustment accuracy and the Cock Valve emphasizes the opening and closing speed, both have high requirements for the accuracy and sealing performance of key parts in manufacturing.
1. Valve body processing
Use high-precision CNC turning + milling + tapping composite process to ensure the dimensional accuracy of the connecting thread and the sealing cavity; the valve body material is mostly forged copper or stainless steel, which is heat treated + stress relieved + precision machined to ensure structural strength and no deformation of the sealing surface.

2. Sealing structure design
Precision grinding ensures interference fit between valve core/ball and valve seat; sealing rings are mostly made of imported PTFE, Viton and other materials, and metal seals or composite seal structures can be selected according to the properties of the medium.

3. Surface treatment
Copper parts are nickel-plated or chrome-plated to prevent corrosion and improve appearance; stainless steel parts are polished + passivated to improve surface corrosion resistance.

4. Finished product inspection
Each batch of products passes multiple processes such as air tightness test, pressure test, opening and closing torque test; Legines produces 2.5 million sets of needle valves, Cock Valves and related joints annually, with stable process batches and small batch errors, suitable for OEM, industrial supporting and export markets.

Legines Industrial Machinery Inc.'s production advantages using CNC processing technology
1. Precision processing to ensure sealing performance
The core of the needle valve lies in the tiny adjustment gap between the needle tip and the valve seat, while the Cock Valve relies on the smooth fitting surface between the ball and the valve seat to complete the opening and closing seal. Legines uses a full CNC machining system to achieve micron-level machining accuracy for key components, effectively improving sealing performance and opening and closing sensitivity, and reducing the risk of leakage caused by machining errors.

2. High machining consistency and stable quality of batch products
CNC technology has high repeatability and batch consistency, and is particularly suitable for products such as Needle Valve and Cock Valve that require extremely high matching accuracy and structural symmetry. Legines uses programmed control and automatic tool compensation technology to ensure that large quantities of valve products are consistent and stable in key indicators such as dimensional error control, surface roughness, and matching clearance accuracy, effectively ensuring the quality of export-level products.

3. Complex structures are formed in one go to improve efficiency
Many Needle Valve and Cock Valve involve multiple processes such as internal thread tapping, bevel drilling, ball milling, sealing chamber turning, and other traditional operations that are difficult to complete in one go. By introducing a composite CNC machining center, Legines can complete multiple key surface machining in one clamping: reduce the number of process conversions and reduce human errors; shorten the processing cycle and improve delivery efficiency; ensure the coordination of multiple components such as valve body and valve core assembly.