Quick specifications
- ThreadsBSP / NPT
- Size range¼" to 4"
- BodySS304, SS316, CS, Brass
- Designs1-pc, 2-pc, 3-pc
- PressureUp to 6000 PSI (bar-stock)
A threaded ball valve (also called a screwed-end ball valve) has female threads on both ends and screws directly onto pipe or fittings. For small bores this is the quickest, most economical connection – ideal for utilities, drains, vents, sampling points and skid-mounted equipment.
Most threaded valves are two-way ball valves: one inlet, one outlet, used for simple on/off isolation. Where you need to divert flow, see our three-way ball valves.
BSP or NPT?
BSP (British Standard Pipe) threads are common in India, Europe and Asia; NPT (National Pipe Taper) threads are common on US-designed equipment. The two are not interchangeable, so please confirm which your pipework uses. We supply both.
One, two or three-piece threaded valves
- One-piece / mini bar-stock – compact and economical, usually reduced bore.
- Two-piece – full or reduced bore, general purpose.
- Three-piece – centre body swings out for maintenance; available with screwed, SW or BW ends.
Installation tips
- Use PTFE tape or a suitable thread sealant on male threads only.
- Hold the valve end hex with a spanner while tightening, never the body or lever.
- Do not over-tighten into fittings – it can distort the body and affect sealing.
Threaded Ball Valve – technical specifications
| Body material | SS304 / SS316 / SS316L, Carbon Steel, Brass |
|---|---|
| Size range | ¼" to 4" (6 mm to 100 mm) |
| Threads | BSP / NPT |
| Pressure rating | Up to 6000 PSI (414 bar) in SS bar-stock designs; design dependent |
| Seat & seals | PTFE, RPTFE, PEEK, Graphite; seals in Viton or NBR |
| Bore | Full bore and reduced bore |
| Operation | Lever, oval handle, pneumatic or electric actuator |
| Temperature | –20 °C to +400 °C depending on seal material (bar-stock range) |
| Testing | API 598 / BS EN 12266 / ISO 5208 |
Ranges shown cover the product family. The exact rating, size and temperature limit for your valve depend on body material, seat material and design, and are confirmed in our quotation and datasheet.
Key benefits
- Fast, low-cost installation for small bores
- No flanges or welding needed
- Compact for skids and instrument panels
- Available in SS for corrosive media
- Two-way on/off isolation in a quarter turn
Applications
- Utility lines – water, air, nitrogen
- Drain, vent and sampling points
- Instrumentation and hydraulic systems
- Chemical dosing lines
Industries served
Frequently asked questions
What is a two-way ball valve?
A two-way ball valve has one inlet and one outlet and is used to start or stop flow. Most threaded ball valves are two-way.
Do you supply NPT threaded ball valves?
Yes. Threaded ball valves are available with both BSP and NPT threads.
What is the maximum size for threaded ball valves?
Threaded designs are typically used up to 4". For larger lines we recommend flanged or butt-weld valves.
Related technical guides
- Types of Ball Valves: A Practical Guide for Plant Engineers
- Ball Valve Installation and Maintenance: A Field Checklist
