2 Piece Threaded Ball Valve

2 Piece Threaded Ball Valve Definition and Components

What is a 2-Piece Threaded Ball Valve and its main parts?

A 2-Piece Threaded Ball Valve is a compact, economical quarter-turn valve designed for on/off isolation in small to medium diameter piping systems. Its defining construction feature is a body made from two primary pieces (typically a main body section and an end cap) that are threaded or bolted together, with threaded (screwed) end connections (NPT or BSP) for pipeline installation. It offers a good balance of durability, simplicity, and cost.

Main Parts:

• Two-Piece Body Assembly: Consists of the main body (containing one threaded end and the ball/seat assembly) and a removable end cap (containing the second threaded end). These are joined by a central threaded connection or bolts.
• Ball: A chrome-plated brass, stainless steel, or carbon steel sphere with a through-hole (port). It can be full-port or reduced-port.
• Stem: A shaft connected to the ball that transmits torque from the handle. It features a blow-out-proof design.
• Seats: Sealing rings (usually PTFE, reinforced PTFE, or nylon) that form a seal between the ball and the body.
• Stem Seals & Packing: O-rings or packing around the stem to prevent leakage.
• Handle/Lever: For manual quarter-turn operation. The handle often indicates valve position (parallel to pipe = open, perpendicular = closed).

Role, Characteristics, and Application Scenarios of 2 Piece Threaded Ball Valve in Pipelines

Functions, Operational Features, Usage Scenarios, and Scenario Diagram

Functions: Provides reliable on/off isolation and flow diversion (for multi-port valves) in low to medium-pressure systems. It is not designed for throttling.

Operational Features:

• Quick Operation: Quarter-turn (90°) open/close action.
• Compact & Lightweight: Easier to install in tight spaces compared to flanged valves.
• Moderate Maintenance: The two-piece design allows for some internal inspection and seat replacement by removing the end cap, without removing the entire valve from the pipeline.
• Lower Cost: Generally more economical than three-piece or flanged ball valves.
• Usage Scenarios: Ideal for a wide range of general utility services.
• Industrial Plumbing: Compressed air, water, oil, and gas lines.
• Process Instrumentation: Isolating gauges, transmitters, and sample points.
• HVAC Systems: Chilled water, heating lines.
• Equipment & Machinery: As a supply shut-off valve.

Irrigation & Water Distribution.

2 Piece Threaded Ball Valve Standards: Materials, Design, and Connections

 Material, Design, and Connection Standards

Industrial valves Material Standards:

• Body & End Cap: ASTM B62 (Bronze), ASTM A216 WCB (Carbon Steel), CF8/CF8M (Stainless Steel 304/316), or Brass UNS C36000/C37700.
• Ball: Chrome-plated Brass, 304/316 SS, or carbon steel with coating.
• Seats & Seals: PTFE (Teflon), RPTFE, Nylon, Viton.
• Design Standards: General industry designs based on:
• API 6D (as a reference for design principles).
• ASME B16.34 for pressure-temperature ratings.
• Fire-Safe Standards: Some may comply with API 607.

Connection Standards:

• Thread Standards: ASME B1.20.1 (NPT - National Pipe Taper) is most common in North America. ISO 7-1 (BSPT - British Standard Pipe Taper) is common in Europe and Asia.
• Pressure Ratings: Typically Class 150 or Class 300 for steel valves, lower for bronze/brass.

How to Select 2 Piece Threaded Ball Valve

 How to Purchase

Define Basic Requirements:

• Size (e.g., 1/2", 3/4", 1" NPT).
• Material (Brass for general use, Stainless for corrosion, Carbon Steel for strength).
• Pressure & Temperature of your system.
• Fluid media (water, oil, gas, mild chemicals).
• Port type (Full or Reduced Bore).
• Identify Suppliers: Source from reputable valve distributors, industrial suppliers, or direct manufacturers. Check for compliance with common standards.
• Request Product Specifications: Ask for a detailed product datasheet confirming materials, pressure ratings, and temperature limits. For bulk orders, consider requesting a sample.
• Compare and Order: Evaluate based on material quality, stated certifications, price, and delivery time. Clearly state thread type (NPT or BSP) on the purchase order.

Pre-Shipment Inspection for Export 2 Piece Threaded Ball Valve and Key Considerations

 Pre-Export Inspection and Precautions

Inspection Protocol:

• Visual & Dimensional Check: Inspect for surface defects. Verify size and check thread quality with a gauge for proper form, taper, and absence of damage.
• Material Verification: For critical materials (e.g., 316SS), review mill certificates if available.
• Pressure Test: Perform a shell test (1.5x rated pressure) and a seat leakage test (1.1x rated pressure with air or water). This is crucial to validate integrity.
• Function Test: Operate the valve several times. Ensure smooth 90° operation, proper handle alignment, and no sticking.
• Packaging Check: Ensure individual valves are packaged to prevent thread damage and corrosion.

Precautions:

• Protect Threads: Essential. Fit durable plastic thread protectors on both ends. These must survive shipping and handling.
• Ship in Open Position: Prevents seats from taking a set under pressure and protects seals.
• Prevent Galvanic Corrosion: If valves are stainless steel, ensure they are not packed in carbon steel strapping or touching dissimilar metals without separation.
• Proper Documentation: Include packing list, product catalogs/certifications, and test reports (if performed) in the shipment.
• Export Packing: Use sturdy cartons or crates. For bulk orders, use pallets with valves boxed individually. Mark boxes with "Protect Threads," "Keep Dry," and the size/material.

2 Piece Threaded Ball Valve Main outer size  

We also supply fire valve and water valves.