Shut-Off, Control and Safety Valves

Ball Valves and Shut-Off Valves

A ball valve opens or closes a cooling circuit in a quarter turn and leaves the full bore free, so it adds almost no resistance to the flow. This group holds 1,713 items: two-piece and three-piece stainless ball valves in 1.4408 CF8M, versions built to the DIN 3202-M3 face-to-face dimension, long-thread ball valves in nickel-plated brass, three-way ball valves with an L-port for switching between two circuits, socket gate valves in 1.4401/1.4408, and gauge isolation valves from Wika and Riegler.

Serviceability decides the design: a three-piece ball valve can be opened without cutting the pipe, a two-piece one is shorter and cheaper. Weld ends for 33.6 mm pipe outside diameter tie the valve permanently into the line, while threaded connections from G 1/8 to Rp/R 1 1/2 stay removable. Stainless steel is the safe choice in a water-glycol circuit; nickel-plated brass only where the rest of the circuit is copper alloy as well. Brands: Fluidics equipment, Riegler, Köly Deutschland, Wika, Sang-A and E.MC.

1,207 items
6 manufacturers
Net prices plus VAT

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Buying guide

How to choose Ball Valves and Shut-Off Valves

What matters when choosing: properties, comparison and typical applications.

How to choose a ball or shut-off valve

⚙ Two-piece or three-piece - Three-piece bodies can be stripped in place, two-piece bodies are more compact. Where the valve stays accessible, the two-piece design is enough.

✓ Material follows the circuit - Stainless 1.4408 CF8M, 1.4401 and 1.4571 fit without restriction. Nickel-plated brass requires a single-alloy circuit throughout.

⚡ Two ports or three - Three-way ball valves with an L-port divert flow instead of merely stopping it, so a standby line can be brought in without a second valve.

↕ Connection type - Female and male threads from G 1/8 to Rp/R 1 1/2, mixed versions, and weld ends for 33.6 mm pipe outside diameter.

⚑ Isolating instruments - Gauge isolation valves with spigot and clamping socket or a swivel socket, in 1.4571 or plain brass, keep the circuit closed while an instrument is replaced.

↻ Electric operation - The SYNTESI shut-off valves in size 1 are available electrically operated with G 1/8, G 1/4 and G 3/8, and as a version without bushings.

Designs and their limits

Ball valve, gate valve and gauge valve compared

Criterion	Two-piece ball valve	Three-piece ball valve	Socket gate valve	Gauge isolation valve
Operating motion	quarter turn	quarter turn	several stem turns	quarter turn
Service in place	valve must be removed	centre section removable	stem can be retightened	instrument swap without draining
Materials in stock	stainless 1.4408, nickel-plated brass	stainless 1.4408 CF8M	stainless 1.4401/1.4408	1.4571, plain brass
Connections in stock	G 1/8 to Rp/R 1 1/2	threads and weld ends 33.6 mm	G 1, DN 25	G 1/2 with 40x5 clamping socket
Typical duty	isolate a riser	isolate and service a riser	shut off a main line	isolate an instrument

Typical applications

Isolating single rack rows, cooling manifolds and CDU connections before service work
Switching to a redundant supply line through three-way ball valves with an L-port
Drain and fill points at the low points of the water-glycol circuit
Isolating gauges, pressure switches and sensors for calibration and replacement
Break points upstream and downstream of pumps, filters and heat exchangers
Welded-in isolation points in main lines where threaded joints are not wanted