How to Choose the Right Needle Valve for Your Application
Needle valves play an important role in fluid systems by providing precise flow control, reliable shutoff, and repeatable performance across a wide range of operating conditions. Choosing the right valve requires understanding the application, media, pressure, and level of flow regulation required. In this video, you’ll learn how to evaluate common needle valve options, including general service, severe service, and toggle valve designs, as well as the advantages of different stem tip configurations. Swagelok® needle valves are available in a variety of materials, flow patterns, and end connections to support everything from basic instrumentation to demanding high-pressure applications.
Video Transcript
One of the questions we get asked quite regularly is, “What kind of needle valve should I select for my application?”
Quite frankly, the answer is very much system- and user-dependent. However, we do have some guidelines that you may want to consider.
When it comes to needle valves, there are two basic kinds of valves: general service valves and severe service valves.
Our general service valves are made from a forged body, and the design has the packing up high on the stem. That means the stem threads are exposed to the system media, and that’s something you need to keep in consideration when selecting a general service valve.
The general service valve comes with three basic stem tips. A soft-seat stem tip is used for applications that are a little dirtier, where you might be concerned about damaging the stem tip itself. If you need more regulation, you can use a V stem tip. For the finest regulation, you have the regulating stem tip. The regulating stem tip requires more turns of the handle to open the valve, but it does offer the finest regulation.
There is one final option, and that’s our toggle valve. It is designed for applications where you need quick open-and-shut operation, or where you need to fully open the valve quickly and leave it completely in the open position.
The severe service valve is made from solid bar stock and has a union bonnet design. The union bonnet design prevents the valve from being accidentally disassembled.
The design of the severe service valve has the packing below the stem threads, so the lubricant is protected from the system media. The severe service valve comes with a standard ball stem tip. It’s a unique design where the ball actually rotates within the stem tip, so as you close the stem tip down to the stem seat, you don’t run the risk of grinding the stem tip into the seat.
The severe service valve also comes with a more regulating stem tip, if that’s what you need.
Hopefully, this has helped you with your needle valve selection. General service valves and severe service valves are available with multiple stem options.
