Pneumatic V-Port Ball Valve (Pneumatic V-Port Control Valve)

Pneumatic V-Port Ball Valve (Pneumatic V-Port Control Valve) Instruction Manual

1. Product Overview
   The pneumatic V-port ball valve (also known as a pneumatic V-port control valve) is a dual-purpose valve capable of both high-precision throttling and rapid shut-off. It features a V-notched ball structure that delivers excellent equal-percentage flow characteristics, enabling precise regulation of flow, pressure, and liquid levels. Additionally, it offers a shearing self-cleaning function, allowing it to cut through fibers, slurries, and particulate media.
   Equipped with a pneumatic actuator, this valve enables automated regulation, remote control, and on/off shut-off operations. It is widely used in industries such as chemicals, papermaking, wastewater treatment, petroleum, thermal power, and the handling of powders, slurries, and high-viscosity fluids. It stands as one of the most commonly used integrated control and shut-off valves in industrial process automation.
2. Core Structural Details
   2.1 Overall Structure
   The complete valve assembly consists of a pneumatic actuator, mounting bracket, stem, bonnet, V-port ball, seat, valve body, and packing seal assembly. It utilizes a one-piece cast or forged body, a top-entry stem, a blow-out-proof design, and a dual-guided, wear-resistant configuration, ensuring structural stability, impact resistance, and a long maintenance-free service life.
   2.2 V-Port Valve Core Structure (Key Features)
3. Special V-Notch Structure: The ball features a V-shaped notch, providing flow characteristics that approximate an equal-percentage curve. It offers sensitive fine-tuning of the opening angle and significantly higher control precision than standard ball valves.
4. Shearing Self-Cleaning Function: The V-shaped edge creates a scissor-like shearing action against the seat, cutting through fibers, fabric strips, flocculent matter, and slurry impurities to prevent valve jamming or clogging.
5. Anti-Jamming Structure: An eccentric spherical design ensures the seat automatically disengages from the ball the moment the valve begins to open, eliminating friction and wear, thereby significantly extending service life.
6. Adjustable Opening Range: Full 0–90° regulation range; can be paired with a positioner to enable intelligent control via a 4–20mA signal. 2.3 Sealing Structure Classification
7. Soft-sealing type (PTFE/PPL): Zero leakage, excellent sealing performance, and high control precision; suitable for clean water, gases, oils, and particle-free media.
8. Hard-sealing type (alloy overlay): Resistant to high temperatures, high pressures, erosion, and particulates; suitable for high-temperature, slurry, pulverized coal, and impurity-laden applications.
9. Material Configuration (Standard materials across the full series)
   3.1 Valve Body Material
10. WCB Carbon Steel: Suitable for standard water, gas, and oil applications at ambient temperatures; cost-effective.
11. CF8 (304 Stainless Steel): Resistant to mild corrosion, steam, and weak acids; suitable for general chemical applications.
12. CF8M (316 Stainless Steel): Resistant to acids, alkalis, salt spray, and corrosion; the preferred choice for chemical, sewage, and seawater applications.
13. WC6 Chrome-Molybdenum Steel: Resistant to high temperatures and pressures, with creep resistance; specialized for high-temperature steam and thermal power applications.
    3.2 Valve Plug/Ball Material
14. 304, 316, 316L Stainless Steel
15. Hard alloy overlay (STL6): Wear-resistant, erosion-resistant, and resistant to particle impact.
    3.3 Valve Stem Material
    2Cr13, 304, 316 Stainless Steel; high strength, fracture-resistant, and resistant to rust and corrosion. 3.4 Sealing Materials and Temperature Resistance
16. PTFE: -20°C to 180°C; zero leakage.
17. PPL (Para-polyphenylene): -20°C to 250°C; high-temperature resistant soft seal.
18. Carbide Seal: -40°C to 350°C; designed for high-temperature and high-pressure applications.
19. Pressure Ratings and Technical Parameters
    4.1 Nominal Pressure
    PN16, PN25, PN40, PN64, PN100; ANSI Standards: Class 150, Class 300, Class 600.
    4.2 Pneumatic Supply Pressure
    0.35–0.7 MPa (compatible with standard factory air supplies).
    4.3 Size Range
    DN25–DN400.
    4.4 Flow Characteristics
    Equal percentage flow characteristic; offers high control precision, stable linearity, and accurate pressure and flow control.
20. Operating Conditions and Applicable Media
    5.1 Advantages in Operating Conditions
21. Suitable for control applications: Automated piping systems requiring flow regulation, precise fine-tuning, and automatic pressure or flow stabilization.
22. Suitable for media with impurities: Handles media containing particles, crystals, dust, or fine impurities; features a shearing, self-cleaning action that prevents valve jamming.

• Suitable for fibrous slurries: Capable of handling paper pulp, chemical fibers, sewage sludge, and viscous liquids—applications where standard ball valves fail.
• Suitable for fluctuating pressure conditions: Structurally resistant to pressure differentials and erosion; ensures stable opening and closing.
  5.2 Applicable Media
  Clean water, sewage, steam, oil products, natural gas, compressed air, chemical fluids (mild acids/alkalis), pulp, slurry, resin, adhesives, high-viscosity liquids, particulate media, powder mixtures, etc. 5.3 Prohibited Operating Conditions
  Highly corrosive media (strong acids/alkalis), molten metal at high temperatures, and media containing large amounts of hard, sharp stones (which cause excessive wear on hard seals).

6. Working Principle
   The pneumatic actuator receives a pneumatic signal or a 4–20mA analog signal from an electro-pneumatic positioner, driving the valve stem to rotate the V-shaped ball 0–90°. By varying the opening area of ​​the V-notch, the flow cross-section is precisely adjusted, enabling stepless control of flow rate and pressure. When fully closed, the V-shaped edge fits tightly against the valve seat, ensuring reliable shut-off and providing dual functionality: regulation and shut-off.
7. Product Advantages Summary

• ✅ Precise equal-percentage regulation; the preferred control valve for automation systems
• ✅ V-notch shearing action provides self-cleaning; resistant to clogging, jamming, and slurry/particle interference
• ✅ Options for soft or hard seals; suitable for a full range of temperatures (ambient to high)
• ✅ Robust structure; resistant to high pressure and erosion; long service life
• ✅ Compatible with positioners, solenoid valves, and limit switches for fully automated control

8. Installation and Usage Tips

• Install according to the flow direction arrow on the valve body; designed for unidirectional flow.
• Ensure the air supply is dry and clean to prevent water or oil accumulation from affecting the actuator’s lifespan.
• For regulating applications, the use of a pneumatic positioner is recommended to ensure linearity and control precision.
• For slurry or particulate-laden media, hard-sealed V-ball valves with hard-faced (stellite-welded) surfaces are preferred.

9. Warranty Information
   This product undergoes rigorous factory testing—including hydrostatic pressure, airtightness, operational function, and regulation precision tests—and comes with a 12-month warranty. Under normal operating conditions and with regular maintenance, free warranty service covers quality defects in the valve body, ball, and stem; seals and wear parts are considered consumables and are excluded from the warranty.