3-Way Ball Valves

Midland high-pressure steel block 3-way L-port ball valves in NPT (1/4 to 2 in.) and SAE straight-thread (7/16-20 to 2-1/2-12) connections: steel body, ball and stem with zinc chromate plate, Delrin ball seats and Buna O-rings (fluoroelastomer on request), as printed for the part numbers on Midland’s catalog page 328. Working pressure is published per part number.

Steel block ball valves

Steel block-body ball valves rated by the manufacturer per part number — pick two-way for shutoff, three-way to divert or select between two paths.

Find by thread type and size

NPT

SAE straight thread

Sizes and thread types as listed in each product title. Pressure rating and seal details are on each product page, as published by the manufacturer per part number.

Questions on size or connection? Ask the Apex Flow Solutions technical desk.

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About steel block ball valves

Pressure, seal material, end connection and other specifications are published by the manufacturer per part number, not as one family-wide figure. Where a spec isn’t published for a given SKU, the product page leaves it blank rather than assuming it matches a similar-looking part.

NPT vs. SAE connections

NPT (National Pipe Taper) is a tapered thread used for general plumbing and process lines. SAE parts use a straight (UNF) thread, listed per part number in the manufacturer’s sizes. Match the connection type already used on your line, and confirm the exact part number’s specifications before ordering.

Frequently asked questions

What’s the difference between a 2-way and 3-way ball valve?

A 2-way valve opens or closes a single flow path — it’s a shutoff valve. A 3-way valve uses an L-port ball to direct flow between two outlet paths from one inlet, so it can divert, select, or isolate a branch line. Choose 2-way for simple on/off service and 3-way when you need to switch or divert flow.

What’s the difference between NPT and SAE connections on these valves?

NPT (National Pipe Taper) is a tapered thread used for general plumbing and process lines. SAE parts use a straight (UNF) thread, listed per part number in the manufacturer’s sizes. Match the connection type already used on your line; exact thread details vary by part, so confirm against the specific SKU before ordering.

Are pressure and seal specifications the same across the whole family?

No — printed pressure ratings, seal material, and other specifications are published by the manufacturer per part number, not as one family-wide figure. Where a spec isn’t published for a given SKU, we leave it blank on the product page rather than assume it matches a similar-looking part. Check the individual product page, or contact us to confirm before you order.

Related

L-Port Flow Pattern

3-way L-port ball valves direct flow between two outlet paths from a single inlet with one quarter-turn handle. The flow path makes a 90° turn inside the ball, connecting the common port to either of the two outlet ports depending on handle position.

Steel Block Construction

These are steel block-body valves. Buna O-rings and Delrin ball seats are printed by Midland for the part numbers on catalog page 328; GE3L38NPTV (3/8 in. NPT) is supplied with fluoroelastomer (Viton) O-rings. For other part numbers, see the product page or ask us to confirm. Where a value is not published by the manufacturer, it is left blank rather than assumed.

Choosing a 3-Way Valve

Match the connection type (SAE straight thread or NPT) to your system and size by the line thread. Media, service and application suitability are not published by the manufacturer for this valve. Tell us your fluid, temperature and working pressure and we will confirm suitability before you order. For two-position on/off service on a single line, see our two-way steel block ball valves, brass ball valves and stainless steel ball valves.