Safety valves engineered for industrial service.
HHSV is a China-based B2B manufacturer focused on safety valves and pressure-relief valves. We support industrial buyers from service-data review and sizing through manufacturing, testing, documentation and repeat supply.
Selection starts with: medium · required capacity · pressures · temperature · backpressure · materials · connections · standards
DN10–600
Company-wide size
0.6–42 MPa
Company-wide pressure
−196–570°C
Company-wide temperature
Across the HHSV portfolio, available manufacturing capabilities extend to DN10–600, 0.6–42 MPa and −196–570°C. Our engineers confirm the exact operating range and certification scope for every selected series.
Choose the protection architecture before the model.
HHSV organizes the range into six product families. Full lift, low lift, balanced bellows, high-temperature and similar terms are configurations or duties inside the relevant family—not parallel top-level categories.
Spring-Loaded Safety Relief Valves
Direct spring-loaded relief for steam, gas and liquid services, including applicable conventional, balanced-bellows, full/low-lift and special-service configurations.
Pilot-Operated Safety Relief Valves
Pilot-controlled main-valve arrangements selected when operating ratio, pressure, capacity, backpressure and service conditions support the architecture.
Back-Flow Safety Valves
For defined reverse-flow protection; not the same function as balanced-bellows backpressure compensation.
Impulse & Main Systems
Impulse-triggered main-valve systems for applicable high-capacity steam and engineered duties.
Vacuum & Breather Valves
Negative-pressure protection and equipment/tank inbreathing or outbreathing functions.
Accessories & Combinations
Quick crossover devices, rupture-disc combinations and related protection-system arrangements.
The service conditions select the valve—not the industry name.
Use the application as the starting context, then confirm the inlet/outlet size, pressure and end connection, actual medium, set pressure, open pressure, back pressure, material of body&trim, and temperature.
Refining & Petrochemical
Backpressure, hydrocarbons, leakage control and project documentation.
Chemical Processing
Corrosive or toxic media, material compatibility and leakage requirements.
Power & Industrial Boilers
Steam capacity, temperature, blowdown/reseating and applicable code scope.
Oil, Gas, LNG & LPG
High pressure, gas tightness, cryogenic service and package integration.
OEM Equipment & Process Skids
Repeatable dimensions, approved BOMs, batches and technical documentation.
Special Service
High/low temperature, vacuum, jacketed, clean and other difficult-service conditions.
Explore six industrial service environments, compare the key operating risks, and move directly from your application to the right product family and engineering review.
Convert process data into a reviewable valve selection.
HHSV converts available process data into a documented valve selection, with calculation assumptions, configuration limits and compliance requirements clearly defined before order approval.
Define the relieving case
Medium, required capacity, operating/set pressure, temperature and backpressure.
Size the required area
Use the applicable API 520, ISO 4126 or project calculation basis.
Choose the configuration
Match family, orifice, materials, connections and backpressure arrangement.
Issue the technical package
Datasheet, calculation, GA drawing, compliance status, deviations and document index.
Scale is useful only when the ordered valve remains traceable and testable.
HSV combines manufacturing scale with controlled materials, production traceability, performance testing and technical-document delivery.
Manufacturing capacity with repeatable control.
Machining, production equipment and factory scale support project supply, OEM repeat orders and custom configurations.
1998
Founded
≈15,500 m²
Facilities
260+
Employees
180+
Production machines
Reported capacity: 8,000 tonnes annually and 10,000+ valve sets per month.
Documented evidence for technical approval and final release.
Traceability and test records are treated as part of the deliverable, not paperwork added after the valve is finished.
Material traceability
MTC, heat number and PMI/NDT where specified.
Production control
Components, springs, assembly and serial status.
Performance testing
Shell, set, reseating and API 527 where applicable.
Document release
Drawings, reports, certificates and nameplates for tracing.
Verify the scope behind the mark.
Certification is part of the product definition. Buyers should check the legal entity, factory, model/pressure range and marking scope of the exact proposed valve. Designed in accordance with, Tested in accordance with and Certified to are separate claims.
ASME UV / National Board
Applicable only to eligible gas-service safety valves without adjusting rings, within the certified model, pressure, location and marking scope.
CE / PED
European pressure-equipment conformity within the applicable product and assessment scope.
ISO Systems
ISO 9001, ISO 14001 and ISO 45001 management-system certifications.
Licenses & Supplier Records
Chinese safety-valve manufacturing licensing plus reported PetroChina, Sinopec and CNOOC supplier records.
Project Experience Built Around Real Service Conditions
Review selected international projects by location, application, valve type, engineering requirement and delivery scope.
Pilot-Operated Safety Valves
High-pressure gas pipeline protection with focus on repeatable set pressure, stable discharge, small blowdown and seat tightness.
Low-Lift Safety Valves
Liquid/incompressible service requiring controlled lift, repeatable set pressure and maintainable configuration.
Full-Nozzle + Balanced Bellows
Steam service using full-nozzle construction for capacity and bellows to reduce outlet-backpressure influence.
RFQ
Service data & specification
Sizing
Selection & technical quote
Approval
Datasheet, GA & deviations
Manufacture
Materials & traceability
Inspection
Tests, witness & MDR
Shipment
Release, logistics & support
Different buyers need different evidence from the same valve.
HHSV separates customer-solution pages by procurement pattern, approval responsibility, documentation burden, repeat-order needs and service expectations.
Importers & Distributors
Mixed RFQs, stock turnover, documentation, batch consistency, spares and repeat orders.
EPC & Project Suppliers
Sizing, technical approval, QAP/ITP, MDR, inspection and project milestones.
Boiler, Vessel & Skid OEMs
Repeatable dimensions, fixed drawings/BOM and batch or call-off supply.
Refineries & Chemical Plants
Leakage, corrosion, backpressure, MRO replacement and shutdown risk.
Power & Industrial Boilers
Steam capacity, temperature, blowdown/reseating and applicable code scope.
Oil, Gas, LNG & LPG Integrators
High pressure, cryogenic materials, gas tightness, inspection and package documentation.
Need a safety-valve selection or quotation?
Send the inlet/outlet size, pressure and end connection, actual medium, set pressure, open pressure, back pressure, material of body&trim, temperature, quantity, inspection and documentation requirements.