Specification

1/2″~4″ PN10~PN64 304/316 Stainless Steel 3-PC Full Port Pneumatic Internal Thread Ball Valve

I. Product Overview

TIANYU 3-PC full port pneumatic internal thread ball valve is a sanitary-grade flow control solution engineered for clean and general industrial systems. Crafted with 304/316 stainless steel—renowned for corrosion resistance and hygiene—it features a three-piece structure, full-port design, and pneumatic actuation to ensure reliable shut-off and regulation of water, oil, air, and mild corrosive media. Operating at -20℃~232℃ and PN10~PN64 (6.4MPa), it balances precision, durability, and ease of maintenance. Compliant with API 598 and CE standards, it is ideal for drinking water treatment, food & beverage, pharmaceuticals, and light industrial applications where clean flow, tight sealing, and operational efficiency are critical.

II. Key Attribute Parameters

Size Range: 1/2″~4″ (DN15~DN100), covering small to medium-diameter pipelines for sanitary and general flow control needs.
Pressure Range: PN10~PN64 (1.0MPa~6.4MPa), adapting to low to high pressure systems such as drinking water supply and industrial oil lines.
Temperature Range: -20℃~232℃, suitable for media from chilled water to moderately heated fluids (e.g., hot water, low-pressure steam).
Material Configuration:
- Body & Cap: 304/316 stainless steel (investment casting), 304 for general use, 316 for enhanced corrosion resistance in humid or coastal environments.
- Ball & Stem: 304/316 stainless steel, ensuring smooth rotation and avoiding contamination in sanitary applications.
- Seat & Packing: PTFE, providing chemical resistance, low friction, and tight sealing without media adsorption.
- Fasteners: 304/316 stainless steel bolts and nuts, preventing rust and ensuring structural stability.
- Actuation: Pneumatic (optional manual lever), with double-acting/single-acting options for automated on-off control.
Connection Type: Internal thread (NPT/BSPT/DIN259), enabling easy, leak-tight installation in threaded pipelines without flanges.
Thread Standards: NPT, BSPT, DIN259, DIN2999, ISO228 Class A, ensuring compatibility with global pipeline systems.

Product Overview

III. Features Description

3-PC Structure: The valve body is divided into three detachable sections (two caps + middle body), allowing in-line maintenance of internal components (ball, seat, stem) without removing the valve from the pipeline. This reduces downtime in critical systems like drinking water supply, where shutdowns disrupt service.
Full-Port Design: The ball’s bore diameter matches the pipeline size, minimizing pressure drop and energy loss. This is especially beneficial for drinking water and food processing, where unobstructed flow prevents stagnation and bacterial growth.
Sanitary Compatibility: 304/316 stainless steel surfaces are smooth (Ra ≤0.8μm) and non-porous, avoiding media retention and simplifying cleaning—meeting hygiene standards for food, beverage, and pharmaceutical applications.
Anti-Blowout Stem: A one-piece stem with a retention shoulder prevents ejection under high pressure (PN64), enhanced by PTFE packing that maintains sealing integrity without media leakage. This design meets safety requirements for pressurized systems.
Pneumatic Actuation Efficiency: Pneumatic actuators enable fast on-off operation (≤5 seconds) and remote control, reducing manual intervention in automated lines such as beverage bottling or water treatment plants. Single-acting models offer fail-safe functionality (default open/closed) for added safety.

IV. Manufacturing Processes

Investment Casting: Body, cap, and ball are produced via investment casting, ensuring precise dimensions and smooth surfaces (Ra ≤1.6μm). This process eliminates porosity, a common source of leakage in cast components.
Thread Machining: Internal threads are precision-cut using CNC lathes to achieve Class A tolerance, ensuring tight engagement with pipeline threads and avoiding leakage. Threads undergo gauging to verify compliance with NPT/BSPT standards.
Surface Finishing: Stainless steel components are passivated (electrochemical treatment) to form a protective oxide layer, enhancing corrosion resistance. The ball and seat surfaces are lapped to Ra ≤0.8μm for smooth operation and tight sealing.
Assembly & Testing:
- Hydrostatic Test: Body tested at 1.5×rated pressure (9.6MPa for PN64) for 30 minutes; seat tested at 1.1×rated pressure (7.04MPa) with water to confirm no leakage.
- Pneumatic Actuation Test: Actuators are tested with 6bar air supply for 1,000+ cycles to ensure smooth operation and consistent response time.
- Sanitary Test: For food-grade models, components undergo ultrasonic cleaning to remove residues, ensuring no contamination risk.

Valve Details

V. Product Advantages

Corrosion Resistance: 304/316 stainless steel and PTFE components resist rust, chemicals, and humidity, extending service life by 2~3 times compared to brass valves in coastal or industrial environments.
Low Maintenance: 3-PC design allows seat replacement or stem packing adjustment without pipeline disassembly, reducing maintenance time by 60% vs. one-piece valves.
Energy Efficiency: Full-port design minimizes pressure drop by 40% vs. reduced-port valves, lowering pumping costs in large-scale water distribution systems.
Sanitary Safety: Smooth stainless steel surfaces and PTFE seals avoid media retention, meeting FDA and EU 10/2011 standards for food and pharmaceutical contact.
Versatile Compatibility: Multiple thread standards and actuation options enable use in global applications, from North American drinking water lines (NPT) to European industrial systems (BSPT).

Application

VI. Application Fields

Drinking Water Systems: Controls water flow in residential, commercial, and municipal pipelines, with 304 stainless steel and PTFE ensuring no taste or odor transfer.
Food & Beverage: Regulates flow of juices, dairy, and cleaning agents in processing and bottling lines, where sanitary design prevents bacterial growth and contamination.
Pharmaceuticals: Manages high-purity water and solvent flow in drug manufacturing, meeting strict hygiene requirements for product safety.
Light Industry: Controls oil, air, and coolant flow in machinery and assembly lines, leveraging pneumatic actuation for automated operation.
Marine & Coastal Applications: 316 stainless steel models handle saltwater and humid air in shipboard pipelines or coastal water treatment plants, resisting chloride-induced corrosion.