Application: Gas Compressor Block Isolation Valve

Sealing

·                 Feature: Mechanically-loaded seal.

o         Benefit: Ability to seal at low pressures in addition to high pressures.

o         Benefit: Bi-directional sealing.

·                 Feature: Resilient seals

o         Benefit: Zero-leakage (bubble-tight shutoff).

·                 Feature: Segmented sphere rotates around a stationary core

o         Benefit: Product (particulates included) directed away from sealing surface. Minimal erosion.

·                 Feature: Minimal contact during all but last 10-15% of closure.

o         Benefit: Less frictional force during closure, longer life of sealing surfaces.

o         Benefit: Low operational force requirement during closure

·                 Feature: Quarter-turn operation, conventional stem packing designs

o         Benefit: Low emissions

o         Benefit: Adjustable in service

Reliability

·                 Feature: Robust stem and driver

o         Benefit: Ability to provide actuator with sizing safety factor of 1.5.

o         Benefit: Minimal concern with “overtorquing”.

·                 Feature: Quarter-turn operation, hemiwedge closure

o         Benefit: Fast closure (0.5 second per NPS or better)

o         Benefit: Ability to slow open (suction valve)

·                 Feature: No cavities to trap fluids

o         Benefit: No concern with thermal lock or overpressure

o         Benefit: No need for pressure relief

·                 Feature: Minimal amount of cavities or voids to collect debris

o         Benefit: Increased cycle life and reliable performance.

·                 Feature: Fire-safe design

o         Benefit: Increased ability to maintain shutoff in the event of a fire.

·                 Feature: Core in-line with valve bore during operation.

o         Benefit: Low turbulence and erosion of valve internals.

Serviceability

·                 Feature: Replaceable cartridge design

o         Benefit: Minimal downtime for valve repair.

o         Benefit: Ability to quickly inspect valve

o         Benefit: In-line maintenance

o         Benefit: No special tools

o         Benefit: Easily capable of revising trim materials

·                 Feature: Pre-tested cartridge

o         Benefit: Confidence in reliable repair.

o         Benefit: No special technician.

o         Benefit: Fewer parts to stock.

·                 Feature: No lubrication required.

o         Benefit: No lubrication required – maintenance savings.

Other

·                 Feature: Low profile (compared to gate and rising stem ball valves)

o         Benefit: Takes up less space in skids

·                 Feature: All trim contained in one cartridge.

o         Benefit: Easy replacement of trim (ex: sweet fluid turns sour)

o         Benefit: Serialization and traceability of trim

o         Benefit: Less apt to make mistakes during servicing.