Undefined acceptance
A phrase cannot replace a measurable criterion.
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Critical Service / Zero Leakage Shut-off
Critical Shut-off Valves Specified by a Measurable Leakage Criterion
Reliable isolation for hazardous media, safety lines and leakage-critical systems.
Buyer priorityDefined leakage criterion
Selection basisMedia + Δp + temperature
Typical solutionBall / gate / triple-offset valve
Engineering focus
Design out the dominant failure risks
Translate zero leakage into a stated class, medium, pressure, temperature, direction and duration, then select and verify the sealing system.
Seat damage
Particles, heat and Δp can prevent repeatable shut-off.
External leakage
Seat tightness does not control stem or joint emissions.
Valve selection
Match the architecture to the duty
Starting points for engineering review. Final selection depends on the completed process data and project specification.
Soft-Seated Ball Valve
Best fit: Tight isolation within seat limits.
Engineering focus: Compatibility, cavity relief and fire safety.
Metal-Seated Valve
Best fit: Hot or abrasive isolation.
Engineering focus: Hardfacing, lapping and thermal distortion.
Triple-Offset Valve
Best fit: Large-size low-friction isolation.
Engineering focus: Seat geometry, direction and actuator margin.
Buyer essentials
Six inputs for a comparable quotation
Send the same completed datasheet to every supplier and require a clear deviations list.
Class, allowable rate, medium and duration.
Media, temperature, pressure and Δp.
Position, emergency function and closing time.
Seat, packing, gasket and emissions.
Power, safety factor and fail action.
Shell, seat, function, fire and emissions.
Service-specific RFQ data
Bidirectional needDBB scopeEmergency timeExternal leakage
Standards & verification
Specify measurable acceptance
Confirm edition, test medium, pressure, duration, leakage acceptance, material traceability and witness points in the purchase order.
API 598ISO 5208ISO 15848-1API 607 / ISO 10497
Buyer FAQ
Does zero leakage apply under every condition?
No. State the exact test and acceptance criterion.
Are soft seats always best?
Temperature, chemistry, fire and wear may require metal seats.
What is needed for emergency shut-off?
Fail action, time, power, margin and control interface.
Send your RFQ for an engineering review
Share the completed datasheet, quantity, destination and delivery target for a practical recommendation and factory quotation.
*Portfolio limits depend on valve type, size, material, pressure-temperature rating and completed engineering review.
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