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Valve Series 1

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| What is a Valve? 

A valve is a device installed in pipelines or pressure vessel to regulate or block the flow of fluids(liquids, gases, steam, etc.)
While fittings connect pipes, valves are responsible for controlling the movement of fluids.

A system cannot function properly if fluids merely flow unchecked. It requires functions such as shut-off, regulation,
backflow prevention, overpressure protection, and directional control. Accordingly, valves are classified into various types,
allowing for the selection of the most suitable valve based on system requirements.

 

| Shut-off and Flow Regulation 

·Ball Valve

A ball valve regulates fluid flow by rotating a spherical disc (ball) within its body.
The ball has a hole through which fluid passes, and turning the ball either opens or closes the flow path.

By rotating the handle 90°, the valve can be quickly opened or closed, offering excellent operability.
The contact performance between the ball and the seat ensures a high level of sealing. Additionally, the ball’s orifice
matches the inner diameter of the pipe, minimizing flow resistance and pressure loss.

Low Pressure
Ball Valve		 One-Piece
Ball Valve		 Swing-Out
Ball Valve		 High Pressure
Ball Valve		 Trunnion Valve
Category
Model V81 V82 V83 V86
VC86		 VT86
Features
  • Compact structure
    with a body made from bar stock1)
  • Designed for relativel
    low-pressure
    applications (70 bar)
  • Low operating torque
    ensures excellent
    usability.
  • Integrated ball-stem
    structure, aligning the
    ball orifice2) directly with the pipeline.
  • Eliminates unnecessary internal space, preventing residual gas.
  • Available in standard,
    low-temperature, and
    high-low temperature
    variants.
  • Various seat material
    options available for compatibility with different fluid temperatures.
  • Allows seat replacement in a swing-out position by removing three of the four fastening bolts.
  • Equipped with a spring behind the disc for enhanced sealing performance.
  • The ball orifice matches the pipeline’s inner diameter, minimizing fluid loss.
  • Suitable for continuous use in high-pressure lines.
  • Small-sized valve
    primarily used in
    instrumentation lines.
  • Multiple disc springs
    reduce operating
    torque and minimize
    component wear.
Usage Water, Oil, Gas,
Petrochemicals,
Instrumentation		 Instrumentation Chemical, Energy,
Pharmaceutical,
Biotechnology, Food		 CNG, Hydrogen, Plant Instrumentation
1))Bar Stock : A long, round metal material manufactured by drawing metal through a mold to achieve
2)Ball Orifice : A hole in the ball allowing fluid to pass through.

·Needle Valve

A needle valve features a needle-shaped disc that enables fine control of fluid flow.
Rotating the stem moves the needle gradually into or out of the seat, adjusting the flow path.

Its threaded structure allows for precise flow control, and it offers excellent sealing performance and durability, making it
suitable for high-pressure systems and instrumentation equipment. However, it has a relatively slow operation speed and
may introduce fluid resistance when fully open.

General Utility One-Piece Bonnet Union Bonnet Cryogenic Valve
Category
Model VG16 V15
VB16		 V16 VYON
Features
  • Upper and lower stems
    are separated to optimize
    operation.
  • The stem thread is located
    in the upper stem, preventing
    wear caused by fluid exposure.
  • Non-rotating stem structure
    enhances durability
  • Easy maintenance of the stem.
  • Utilizes hard chrome-plated
    stems.
  • Equipped with a panel nut for
    convenient installation in
    instrumentation boxes.
  • Non-rotating stem design
    ensures high durability.
  • The body and bonnet are
    securely fastened with a union nut, ensuring stability.
  • The body and bonnet
    are bolted together for
    enhanced stability.
  • Extended stem and bonnet
    prevent damage from low-
    temperature fluids.
  • Non-rotating stem-disc
    design ensures durability.
Usage General Industry, Instrumentation LNG, LN2(Liquid nitrogen),
Shipbuilding, etc.

·Plug Valve

A plug valve controls fluid flow by rotating a cylindrical or tapered plug (disc) within the body.
The flow path is opened or closed as the plug turns.

This valve allows for quick operation with just a 90° rotation, and its simple structure makes maintenance easy.
Various sealing methods (lubricated/non-lubricated) are available, allowing application in diverse industries.
However, friction can increase in high-pressure or high-temperature environments, potentially limiting its use.

Category Model Features Usage
Plug Valve V23
  • Operates by rotating the plug
    inside the body with a 90°
    handle turn.
  • Simple structure facilitates
    easy maintenance.
  • Low operating torque ensures
    excellent usability.
 Instrumentation

Valves are not merely connecting components but play a crucial role in precisely controlling fluid flow and enhancing
the safety and efficiency of systems. Each valve is designed for specific functions and environments, and selecting the
appropriate valve significantly impacts system performance and maintenance costs.
Choosing the right valve for the intended application and operating conditions is essential.

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