Define what the valve needs to do: isolation, flow control, pressure regulation, backflow prevention, pump protection, steam venting, boiler drain service, emergency shut-off or severe-service isolation. A valve for basic water isolation will not have the same requirements as a valve for high-pressure steam, corrosive chemicals, abrasive slurry or critical process control.

Different valve types are designed for different duties. Butterfly valves and ball valves are common for isolation, control valves and segmented ball valves can regulate flow or pressure, check valves protect pumps, and plunger valves or specialized severe-service valves may be needed for demanding applications.

Flowtork can help evaluate Bray butterfly and ball valves, VAG water and wastewater valves, Mascot control valves and high-performance Bray severe-service options depending on the application.

Steam service involves high temperature, pressure changes, thermal cycling and demanding sealing requirements. Applications may include main steam isolation, boiler vents and drains, feedwater drains, turbine drains, superheater vents, sootblower isolation, bypass lines and condensate systems.

A standard soft-seated valve may not be suitable for high-temperature steam. These services often require pressure-rated materials and seat designs that can handle heat, pressure and repeated expansion.

Bray Severe Service valves may be considered where standard valves are not enough: high pressure, high temperature, superheated steam, abrasive media, corrosive media, erosive duty, critical isolation and tight shut-off requirements.

These applications are common in power generation, boiler systems, steam utilities, mining, oil and gas, refining, chemical and specialty process industries.

Confirm normal pressure, maximum pressure, steam temperature, superheated conditions, pressure surges, thermal cycling, start-up and shutdown conditions and required safety margin.

An under-rated valve may leak, fail or become unsafe. An over-specified valve may add cost without improving performance.

The valve body, disc, ball, seat, stem, seals and trim must be compatible with the media, pressure, temperature and environment. For seawater, chemicals, acids or ultra-pure water, special materials or linings may be needed.

For steam and severe service, seat and trim design are especially important because high temperature and pressure can damage unsuitable materials.

A valve for clean water is different from a valve for wastewater, seawater, steam, condensate, fuel, oil, gas, slurry, acid or chemical service. Confirm media type, temperature, pressure, solids content, corrosiveness, abrasiveness, viscosity and whether the service is clean, dirty, toxic or critical.

Manual operation may be enough for simple isolation or valves that are rarely operated. If the valve needs frequent operation, remote control, position feedback, process automation or safer operation, automation should be considered.

Flowtork can match valves with electric actuators, pneumatic actuators, gearboxes, control accessories and feedback devices.

Replacement or upgrade projects often require more than the valve itself. Pipe spool replacement, mating flanges, gaskets, bolts and nuts, reducers, supports, fittings and other appurtenances may be needed for proper installation.

Reviewing these details early helps avoid installation delays, misalignment, leakage and unexpected costs.

Valve selection should not be based on purchase cost alone. A cheaper valve may become more expensive if it causes leakage, frequent replacement, difficult maintenance, downtime or safety issues.

Consider service life, spare parts availability, seat and seal replacement, accessibility, automation compatibility and after-sales support.