Select the relief architecture around the pressure, temperature, gas service and package constraints.
HHSV supports equipment and skid integrators with sizing, configuration review, traceability, testing and project documentation for high-pressure, gas, low-temperature and packaged-system duties.
Eight constraints can change the final valve or system configuration.
High pressure
Operating/set pressure, required capacity and connection class must be checked against the selected model’s actual range.
Cryogenic / low-temperature service
Confirm the minimum design/relieving temperature, material toughness and selected-series capability; do not apply a company-wide low-temperature limit to every model.
Gas tightness
Gas service increases the importance of seat condition, operating margin and the specified leakage/test acceptance basis.
Backpressure
Review constant/variable outlet pressure and discharge-system behavior before choosing conventional, balanced-bellows or pilot architecture.
Material compatibility
Match body, trim, bellows and sealing materials to the actual medium, temperature and project material specification.
Limited installation space
Confirm envelope dimensions, inlet/outlet orientation, maintenance access and piping loads before freezing the skid layout.
Documents & inspection
Define datasheets, drawings, MDR, inspection and third-party witness requirements before manufacture.
Delivery milestones
Separate material lead time, manufacturing, inspection/witness and document-release milestones when they drive delivery.
Start from seven service inputs—not from the valve family name.
Medium
Gas, vapor, liquid, LNG/LPG or other actual service medium and relevant properties.
Required capacity
Credible relief case and required relieving load.
Operating / set pressure
Normal/max operating pressure, set pressure and required operating margin.
Temperature
Operating and relieving temperature, including low-temperature conditions.
Backpressure
Superimposed/variable outlet pressure and expected built-up backpressure.
Connection
Size, rating, face/type, inlet/outlet orientation and package interface.
Material
Body/trim/seal/bellows material requirements tied to medium and temperature.
Use each architecture for the problem it actually solves.
Pilot-Operated Safety Relief Valves
Evaluate pilot/main-valve architecture for service conditions where its operating characteristics and actual model range are appropriate.
Conventional / Balanced Bellows
Balanced bellows are a spring-loaded configuration used to reduce the influence of outlet backpressure; they are not the same function as a Back-Flow Safety Valve.
Vacuum & Breather Valves
Use dedicated negative-pressure or breathing products for tank/equipment inbreathing/outbreathing duties rather than applying positive-pressure valve data.
Protection Systems & Accessories
Quick crossover devices, rupture-disc combinations or other accessories are evaluated at the system level and linked to the actual safety-valve duty.
Trace the materials, test scope and documents to the actual supplied configuration.
Low-temperature material traceability
For applicable low-temperature products, maintain material/heat and valve identification records to the order scope; material suitability must be confirmed for the selected series and temperature.
Testing & third-party witnessing
Execute the specified inspection/performance-test scope with third-party witness or hold points where required by the approved ITP/order.
Datasheets & drawings
Control service data, selected configuration, dimensions/connections and applicable compliance information through the approved technical submittal.
MDR
Compile the agreed material, inspection, test, conformity and final drawing/document records applicable to the delivered equipment package.
Freeze the relief basis before freezing the skid layout.
Service data
Provide medium, capacity, pressures, temperature, backpressure, connections and materials.
Sizing
Establish calculation basis and required relieving area/capacity.
Configuration review
Confirm valve architecture, dimensions, orientation, materials and package integration constraints.
Approval & inspection plan
Close drawings/documents, certification scope, deviations and third-party/ITP requirements.
Manufacture, test & release
Control manufacture, inspection/testing, MDR completion and shipment milestones to the approved order scope.
Use project evidence without relabeling the application.
Pilot-Operated Safety Valves
HHSV supplied pilot-operated safety valves in volume for high-pressure gas-pipeline overpressure protection in a Dubai petrochemical project. Selection priorities included precise set-pressure behavior, stable discharge, small blowdown and seat tightness.
This is high-pressure gas project evidence; it is not presented as an LNG project and its unpublished pressure, temperature, material and quantity details are not reconstructed.
Do not turn one model’s data into a product-family claim.
Size, pressure, temperature, material, backpressure, leakage/testing and certification limits must be checked against the selected series/model and actual certificate scope. “Designed in accordance with,” “tested in accordance with” and “certified to” remain separate statements.
Quality & Testing
Review material traceability, inspection and performance testing controls.
Send the service data and package constraints together.
Include medium, required capacity, operating/set pressures, temperature, backpressure, connections, materials, envelope/orientation limits, standards, inspection/document requirements, quantity and delivery milestones.