BALL VALVES
BALL VALVES
Chemline offers a wide selection of ball valves in a variety of materials and pipe sizes up to 6” full port.
The wide selection of types covers many applications. Chemline ball valves have shown successful long-term service in thermoplastic and composite piping systems.
Ball Valve Selection
True Union Ball Valves
| Materials | Sizes | Function | Fluids - Corrosives, Potable Water, High Purity Water | Cost | Model |
|---|---|---|---|---|---|
| PVC | 1/2" to 4" | 2-way On/Off | COR, POT | $$ | Type 24 |
| PVC, PP, PVDF | 1/2" to 2" | 2-way On/Off | COR, HPW | $$$ | Type 25 |
| CPVC | 1/2" to 4” | 2-way On/Off | COR, POT | $$$ | Type 26 |
| PVC, PP, CPVC, PVDF | 1/2" to 4" | 2-way On/Off | COR, POT, HPW | $$$$ | Type 21 |
| PVC, CPVC | 1/2" to 4" | 2-way On/Off | Non-hazardous, POT | $ | Type 20 |
| PVC | 1/2" to 2" | 2-way On/Off | Non-hazardous, POT | $ | Type XLT |
Multi-Port Ball Valves
| Materials | Sizes | Function | Fluids - Corrosives, Potable Water, High Purity Water | Cost | Model |
|---|---|---|---|---|---|
| PVC, PP, PVDF | 1/2" to 2" | 3-way, Horizontal Ports | COR, POT, HPW | $$ | Type 33 |
| PVC, PP, CPVC, PVDF | 1/2" to 4" | 3-way, Vertical Ports | COR, POT, HPW | $$$$ | Type 23 |
Other Ball Valves
| Specialty | Materials | Sizes | Function | Fluids - Corrosives, Potable Water, High Purity Water | Cost | Model |
|---|---|---|---|---|---|---|
| Compact | PVC, CPVC | 1/2" to 2" | 2-way On/Off | Non-hazardous fluids | $$ | Type 27 |
| High Capacity | PVC, PP, PVDF | 2-1/2" to 6" | 2-way On/Off | COR, HPW | $$$ | HC Series |
| Metering | PVC, PP | 1/2" to 1" | 2-way Metering | COR, HPW | $$$ | SM Series |
| Proportional | PVC, PP, PVDF | 1/2" to 2" | 2-way Flow Control | COR, HPW | $$$ | SP Series |
| Cavity Free | PVC, PP | 1/2" to 2" | 2-way On/Off | COR, with solids | $$$ | SL Series |
| Hybrid Ball | PFA, PVDF* | 1" to 1-1/2" | 2-way On/Off | COR, HPW | $$$ | HB Series |
* Hybrid ball valves have PPG or PPSG bodies lined with PFA or PVDF
Why a Ball Valve?
All Chemline ball valves are “full port” type with bore equal or close to the pipe inside diameter. Pressure drop is minimal. For this reason, they are an excellent
choice as an isolation valve, which is usually open.
Ball valves are intended for on/off control of clean fluids. They do not throttle or regulate flow well. Generally, they are not suited for slurries or applications
with solids. The exceptions are Chemline metering and proportional ball valves which are designed for precise flow regulation and the SL series zero cavity ball
valve designed to handle solids.
Quick opening quarter-turn operation makes ball valves a popular choice. They are also the most economical valve type in sizes up to 2” or 3”.
The 90-degree operation and relatively low stem torques make them inexpensive to actuate electrically or pneumatically.
Most Chemline ball valves have True Union ends. The valve body slips out for maintenance without moving piping. Installation labour for socket True Union
valves is a fraction of that for installing any threaded valves.
How do Ball Valves work?
The ball rotates 90 degrees, between PTFE seats, which provide both lubrication and tight sealing in the closed position.
Most valves are “floating ball” type. The ball attaches to the stem, which allows movement of the ball in the closed position. Upstream pressure pushes the
closed ball into the seat.
Full port 6” valves are “trunnion” type to reduce opening and closing torques under pressure. Valves will have a one-piece ball with upper stem and lower
stem (trunnion). The trunnion supports against the high hydraulic force with full pressure against the 6” diameter closed ball.
How are Ball Valves connected to piping?
Socket welding is the usual pipe connection method for PVC and CPVC ball valves.
Threaded ends are available but are often expensive to install due to labour to thread pipes. Some chemicals tend to leak through threads.
Polypropylene (PP) and PVDF ball valves have metric ends to connect to standard metric (DIN) pipe and fittings (offered by Chemline). Butt fusion is the technically
best joining method, chosen for high purity water, but PP metric socket ends are popular in all other applications. Chemline supplies butt fusion and socket fusion pipe welders.
Flanged ends are available for connection to dissimilar piping material of all types. To reduce excessive stress on plastic flanges, Chemline recommends GA
Series low torque flange gaskets always be used.
All True Union ball valves up to 1” are available with ChemFlare™ ends. They connect to flared PFA tubing in a ChemFlare™ leak-free system of tubing,
fittings, valves and adaptors. ChemFlare™ is a replacement option for ½” and ¾” PVC piping in chemical dosing systems when chemicals leak through the solvent weld connections.
