Safety Valve Manufacturer in China
We manufacture spring-loaded safety valves in micro-lift, full-lift, threaded and flanged designs for steam, gas and liquid pressure systems. Multiple pressure ratings, sizes and material options are available to match different operating conditions.
Safety Valve Product Range
Explore our range of safety valves for pressure protection in steam, gas and liquid systems. Our product line includes micro-lift, full-lift, threaded, flanged and special-purpose designs, with different pressure ratings, materials and configurations available for various operating conditions.
Micro-Lift Safety Valves
Spring-loaded safety valves with controlled valve lift, available in threaded and flanged configurations for pressure protection in steam, gas and liquid systems.
Full-Lift Safety Valves
Full-lift spring safety valves designed to provide a larger discharge opening when system pressure reaches the set pressure, with multiple sizes and pressure classes available.
Bellows Safety Valves
Bellows-type safety valves designed with a bellows structure to suit applications where pressure conditions around the valve outlet require additional consideration.
High-Pressure Safety Valves
Safety valves configured for higher-pressure systems, with dedicated pressure classes, dimensions and material combinations for demanding operating conditions.
Lever Safety Valves
Safety valves equipped with a lifting lever for manual opening or functional checking where the valve design and operating conditions permit.
Threaded Safety Valves
Compact threaded safety valves for installations where a flange connection is not required, with multiple pressure and material options available.
Flanged Safety Valves
Flanged safety valves for industrial piping and pressure equipment, offered in micro-lift, full-lift and special structural designs.
LPG Safety Valves
Special-purpose safety and relief valves designed for liquefied petroleum gas systems, available in vertical and horizontal configurations.
Custom Safety Valve Design
Set Pressure, Blowdown & Discharge Capacity
Compare the key pressure and discharge characteristics of our A21, A41 and A42 safety valve series. Final valve sizing should be based on the service medium, set pressure, relieving conditions, temperature and required discharge capacity.
| Parameter | A21 Micro-Lift | A41 Micro-Lift | A42 Full-Lift |
|---|---|---|---|
| Connection | Threaded | Flanged | Flanged |
| Nominal Pressure | PN1.6 / PN4.0 / PN6.4 | PN1.6 / PN4.0 / PN6.4 | PN1.6 / PN4.0 / PN6.4 |
| Set Pressure Range | 0.1–6.4 MPa* | 0.1–6.4 MPa* | 0.1–6.4 MPa* |
| Discharge Pressure | ≤ 1.1 Pk | ≤ 1.1 Pk | ≤ 1.1 Pk |
| Reseating Pressure | ≥ 85% Pk | ≥ 85% Pk | ≥ 85% Pk |
| Derived Blowdown | ≤ 15%** | ≤ 15%** | ≤ 15%** |
| Opening Height | 1/20 of flow diameter | 1/20 of flow diameter | 1/4 of flow diameter |
| Discharge Coefficient | 0.16 | 0.16 | 0.75 |
| Discharge Characteristic | Micro-lift | Micro-lift | Full-lift / higher discharge capability |
| Typical Selection Focus | Compact threaded installation | Flanged industrial installation | Applications requiring greater relieving capability |
** Derived Blowdown: Calculated from the catalog reseating requirement of ≥85% of set pressure (Pk); it is not a separately stated catalog blowdown value.
Capacity Note: Actual relieving capacity depends on the service medium, relieving pressure, temperature, effective flow area and required discharge rate. Discharge coefficient alone should not be used for final valve sizing.
Various Connection Types
In industrial projects, check valves must comply with the corresponding connection methods and installation requirements.
Safety Valve Applications
As a safety valve manufacturer in China, we provide safety valves for pressure protection across steam, air, gas and liquid systems. Different valve structures, pressure ratings and material configurations are available for different operating media and conditions.
Steam Systems
Safety valves for steam piping and pressure systems, with micro-lift and full-lift designs available for different pressure protection requirements.
- A41 Series
- A42 Series
Air & Gas Systems
Spring-loaded safety valves for protecting pressurized air and gas systems against excessive pressure. Threaded and flanged configurations are available for different installation requirements.
- A21 Series
- A41 Series
- A42 Series
Water & Liquid Systems
Safety valves for water and compatible liquid systems where controlled pressure relief is required. Valve material, sealing configuration and pressure rating should be selected according to the actual medium and operating conditions.
- A21 Series
- A41 Series
- A42 Series
LPG Systems
Dedicated safety valves and safety relief/return valves for liquefied petroleum gas systems, available in different structural and installation configurations.
- A42F
- AH42F
- AHN42F
Looking for the Right Valve?
Tell us your medium, pressure, temperature, valve size or application. Our team will help you find a suitable valve solution and provide a quotation.
Frequently Asked Questions About Safety Valves
1. What is the difference between micro-lift and full-lift safety valves?
Micro-lift and full-lift safety valves use different opening structures and are selected according to the required discharge performance and operating conditions. Our catalog includes A21 and A41 micro-lift safety valves as well as A42 full-lift safety valves. The final selection should be based on the medium, set pressure, temperature, required discharge capacity and installation conditions.
2. What media can your safety valves be used for?
Depending on the valve model and material configuration, our safety valves are available for media such as water, steam, air, gas and liquefied petroleum gas. Medium compatibility should always be checked together with operating temperature, pressure and valve material before selection.
3. What pressure ranges are available for your safety valves?
Available pressure ratings depend on the valve series. Our catalog covers multiple nominal pressure classes, including common 1.6, 2.5, 4.0 and 6.4 MPa configurations, as well as higher-pressure A42Y-160 and A42Y-320 series. The required set pressure and operating conditions should be confirmed before selecting a model.
4. What temperature range can your safety valves handle?
The allowable temperature depends on the safety valve model, body material, sealing material and service medium. Different models in our catalog are specified for different temperature limits, so temperature should be confirmed together with pressure and medium rather than using one temperature range for the entire product line.
5. What information should I provide when selecting a safety valve?
To select a suitable safety valve, please provide the service medium, set pressure, operating pressure, operating temperature, nominal size (DN), connection type and preferred material. For applications with specific discharge requirements, the required relieving capacity and installation conditions should also be considered.