Explore Spirax Sarco isolation valves, including bellows sealed stop valves and ball valves for safe shut-off and reliable steam system maintenance.
Isolation valve selection usually becomes easier when buyers compare shut-off duty, pressure drop, leakage control, automation needs and the surrounding steam-system arrangement rather than starting from product names alone.
| Valve family | Most relevant when | Typical selection priority | Next route |
|---|---|---|---|
| Ball valves | Quarter-turn operation, low pressure drop and straightforward automation matter | Fast shut-off, compact actuation, full bore options where turbulence should be minimised | Browse ball valves |
| HV3 stop valves | Manual linear shut-off is preferred for general steam and condensate duties | Robust service, accurate shut-off and straightforward maintenance access | Browse HV3 stop valves |
| Bellows sealed stop valves | Stem seal leakage control and low-emission shut-off requirements carry more weight | Containment, reduced packing-maintenance concerns and higher leakage-control expectations | Browse bellows sealed stop valves |
Steam isolation valves are used to shut off steam, condensate or process lines so operators can isolate equipment, protect plant sections and carry out maintenance more safely. In practical terms, they support shut-off integrity, maintainability and control of leakage risk around the isolation point.
Ball valves are typically chosen where quarter-turn operation, straightforward automation and low pressure drop are priorities. Full bore ball valves can also be useful where upstream turbulence should be minimised, for example around flow measurement or sensitive downstream equipment.
Stop valves are often selected where users need robust manual shut-off in steam duty, while bellows sealed stop valves become more relevant when stem seal leakage control, low-emission operation and reduced packing-maintenance attention are part of the specification.
An isolation point is often designed with supporting ancillaries such as strainers, check valves, separators and gauges. The right surrounding arrangement depends on fluid condition, reverse-flow risk, moisture carryover, maintenance access and how the isolated section will be operated.
Isolation-valve searches usually split between shut-off style and leakage expectations. Start with ball valves when quarter-turn operation, low pressure drop or compact automation are the main priorities. Move into bellows sealed stop valves when stem-seal leakage control and low-emission shut-off carry more weight.
Use HV3 stop valves when the duty is a more conventional manual stop-valve arrangement for steam or condensate service. If the isolation point also depends on surrounding line protection, continue into steam check valves and strainers.
BSA2T is part of the Spirax Sarco BSA and BSAT bellows sealed stop valve range. It combines a ductile iron body with double bellows sealing to reduce external stem leakage risk while supporting dependable manual isolation in steam
BSA3T is the carbon steel branch of the Spirax Sarco BSA and BSAT bellows sealed stop valve range. It is used where dependable manual isolation, reduced external stem leakage risk and a higher pressure-class route matter in steam,
Three-piece ball valve for on/off isolation of steam and industrial fluids, with full-bore and reduced-bore ports plus screwed, welded and flanged connection options.
BSA1T is a cast iron, 16 bar bellows sealed stop valve with a throttling plug and locking device for manual isolation and limited throttling in steam, condensate, water, gas and compatible industrial fluid systems.
A PN25 gunmetal-bodied globe stop valve with screwed BSPP connections from ½ to 2 in for isolating compatible steam, water, oil and air services.
