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
Catalog-wide manufacturing envelope only. Exact model limits and certification scope must be confirmed for the 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 actual medium, capacity, pressures, temperature, backpressure, material compatibility, standards and required certification.
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.
One consolidated Applications page: compare the six service environments, then move from application → service conditions → product family → engineering selection.
Convert process data into a reviewable valve selection.
Sizing is part of the supplied engineering work. Missing inputs, assumptions, configuration limits and compliance requirements should be visible before the commercial order is released.
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.
HHSV combines production machinery, material/NDT capability, assembly and valve-performance testing. The homepage shows scale together with the controls that make it relevant to industrial procurement.
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.
Evidence the buyer can verify before 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 MDR deliverables.
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 Section VIII authorization and National Board records must be checked against actual 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.
References should show the duty, valve type and deliverables.
The current Projects page is intentionally consolidated. Project examples are stated by actual service without inventing missing pressure, material, quantity or certification details.
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 medium, required capacity, operating/set pressure, temperature, backpressure, connections, materials, standards, quantity, inspection and documentation requirements.