How to Find the Right Ball Valve on Gemini Valve

Start with the filter that eliminates the most options: actuation type. Gemini Valve organizes its catalog by actuation type, body material, valve style, and pipe size, so working through those four dimensions in order will narrow the catalog to a short list before you compare series. If you already know your existing model number, skip the browsing entirely and use the Find Your Product Model ID tool instead.

Step 1: Choose your actuation type

The site splits products into three actuation categories:

• Pneumatic actuated ball valves — for automated applications where compressed air is available
• Electric actuated ball valves — for automated applications where an electric signal is preferred
• Manual ball valves — for hand-operated points

If your application requires automation, the choice between pneumatic and electric usually comes down to what utility you already have at the valve location rather than valve performance.

Step 2: Choose your body material

Available material filters:

Step 3: Choose your valve style

• 2-way ball valves — standard on/off or throttling flow
• 3-way ball valves — diverting or selecting between two paths
• 2-piece ball valves — common general-purpose construction
• 3-piece ball valves — typically chosen when in-line servicing matters

The 309 Series Diverter Ball Valves are a specific 3-way option: a 90° three-port valve designed to hold bubble-tight performance whether used as a diverter or as a selector valve.

Step 4: Choose your pipe size

Sizes are listed in both NPS and DN:

• NPS: 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2"
• DN: 7.5mm, 10mm, 15mm, 20mm, 25mm, 32mm, 40mm, 50mm

Step 5: Match a featured series to your application

Once the four filters above are set, the series descriptions tell you which one fits your operating conditions:

• Performance Automation Series — for OEM and end-user automated valve applications that need superior, long-term performance
• General Industrial Series — actuated and manual ball valves for a variety of industrial and OEM applications
• Serviceable Series — designed for easy, ongoing servicing and low long-term maintenance costs
• Compression End Series — a tube-end compression alternative to high-pressure instrumentation models
• 400 Series for 76, 86, 96 — noted as the first in the ball valve industry to offer direct actuator-to-valve mounting
• 400 Series for 89 — for 89 Series ball valves, now part of the Serviceable Series
• 309 Series Diverter Ball Valves — the 3-way diverter/selector option described above

Note the site carries a notice about a Legacy Model 400 Actuator Update, so if you are working with a legacy 400 Series unit, check that notice before ordering.

Step 6: Narrow further with feature and industry filters

If the short list is still too long, apply the feature filters:

• Food grade
• Vacuum
• Timer actuated control
• Failsafe
• Lockable
• Weather resistant

You can also start from your industry instead: automotive, chemical processing, HVAC, fluid fill, food processing, OEM, oil & gas, and water treatment are all listed as served industries.

If you already have a model number

Two resources exist for this case:

1. Find Your Product Model ID — identifies the model from what you have on hand
2. How to Configure Model Number — walks through building or decoding a model number

There is also a Configurator accessible from the site header, and a Request a Quote path under Customer Service if you would rather have the selection confirmed before ordering.

Common sticking points

• Legacy vs. current series overlap. The 89 Series now sits inside the Serviceable Series, and the 400 Series has a legacy actuator update notice — confirm which generation you are replacing before matching part numbers.
• Compression end vs. instrumentation. The Compression End Series is positioned as an alternative to high-pressure instrumentation models, not a replacement for them; check your pressure requirement before substituting.
• Diverter vs. selector. The 309 Series is specified for both roles, but you should confirm which function your line requires, since the porting logic differs.
• Cart and login. The site shows a cart ("Selections 0") and a Configurator Login, but the available material does not state pricing or whether browsing requires an account — treat those as unconfirmed and check directly if they affect your decision.