A28H Spring Full Lift Safety Valve with Lever
• A28H-10/16Q/16C/25C/40C/64 spring full lift safety valve with lever
• A28Y-25/40/64P/R series for corrosive media applications
• Threaded connection, DN15–DN80, working temperature ≤200°C
• Full lift design with lever for manual testing, discharge coefficient 0.65
• For steam, water, air, nitrogen-hydrogen gas, and corrosive media
Gaoshan Valve — A28H Spring Full Lift Safety Valve with Lever
Model: A28H-10 / A28H-16Q / A28H-16C / A28H-25C / A28H-40C / A28H-64 / A28Y-25P/R / A28Y-40P/R / A28Y-64P/R | Pressure: PN10 ~ PN64 | Connection: Threaded | Medium: Steam, Water, Air, Nitrogen-Hydrogen Gas, Corrosive Media
Product Overview
The A28H Spring Full Lift Safety Valve with Lever is a high-capacity threaded pressure relief device featuring a manual test lever for periodic inspection. Designed for steam, water, air, nitrogen-hydrogen mixed gas, and other media systems operating at temperatures up to 200°C, this valve provides maximum discharge capacity through its full-lift disc mechanism. The integrated lever allows operators to manually lift the valve disc for functional testing without requiring system pressure buildup, ensuring the valve remains operational and ready for emergency overpressure events. The A28Y-P/R series offers stainless steel construction for reliable performance in corrosive media environments.
Key Advantages
Full Lift Maximum Discharge
Full-lift disc design provides substantially greater discharge capacity than low-lift valves, making the A28H ideal for applications requiring rapid pressure relief during overpressure events.
Integrated Manual Test Lever
The side-mounted lever allows manual lifting of the valve disc for periodic functional testing without waiting for system pressure to reach the set point, ensuring operational readiness and compliance with safety inspection requirements.
Compact Threaded Installation
Threaded inlet and outlet connections enable quick, tool-free installation in small-diameter pipelines, pressure vessels, and compact industrial equipment where flanged connections are impractical.
Corrosion-Resistant A28Y Series
The A28Y-P/R variant features all-stainless steel construction including body, bonnet, disc, and seat, providing superior resistance to corrosive chemicals, acids, and aggressive process fluids.
Wide Pressure Coverage
Available from PN10 to PN64 with set pressure ranges from 0.1 MPa to 6.4 MPa, covering a comprehensive spectrum of low to high-pressure industrial and commercial applications.
Reliable Spring Actuation
Precision-calibrated 50CrVA alloy spring ensures consistent set pressure with automatic reseating when pressure normalizes. The full-lift mechanism minimizes seat wear while maximizing flow capacity.
Pressure Test Data
| Parameter | A28H-10 | A28H-16Q/16C | A28H-25C | A28H-40C | A28H-64 |
|---|---|---|---|---|---|
| Set Pressure Range (MPa) | 0.1 ~ 1.0 | 0.1 ~ 1.6 | 0.1 ~ 2.5 | 0.1 ~ 4.0 | 0.1 ~ 6.4 |
| Seal Test Pressure | When Ps < 0.3 MPa: Ps − 0.03 MPa; When Ps ≥ 0.3 MPa: 90% of set pressure | ||||
| Discharge Pressure | ≤ 1.03 × set pressure | ||||
| Reseating Pressure | ≥ 90% of set pressure | ||||
| Opening Height | ≥ 1/4 throat diameter | ||||
| Working Temperature | ≤ 200°C | ||||
| Discharge Coefficient | 0.65 | ||||
| Applicable Medium | Steam, Water, Air, Nitrogen-Hydrogen Mixed Gas | ||||
Materials for Main Parts
| Model | Body, Bonnet | Valve Disc, Seat | Spring | Application |
|---|---|---|---|---|
| A28H-10 | Cast Iron | 2Cr13 | 50CrVA | Steam, Water, Air |
| A28H-16Q | Ductile Cast Iron (QT450) | 2Cr13 | 50CrVA | Steam, Water, Air |
| A28H-16C / 25C / 40C / 64 | WCB Cast Steel | 2Cr13 | 50CrVA | Steam, Water, Air |
| A28Y-25P/R / 40P/R / 64P/R | Stainless Steel | Stainless Steel | 50CrVA | Corrosive Media |
Dimensions & Weight
| DN (mm) | d0 (mm) | R | L (mm) | L1 (mm) | G | ≈H (mm) |
|---|---|---|---|---|---|---|
| 15 | 10 | 1/2″ | 37 | 65 | 3/4″ | 140 |
| 20 | 12 | 3/4″ | 40 | 67 | 1″ | 150 |
| 25 | 15 | 1″ | 45 | 78 | 1 1/4″ | 158 |
| 32 | 20 | 1 1/4″ | 60 | 90 | 1 1/2″ | 215 |
| 40 | 25 | 1 1/2″ | 67 | 105 | 2″ | 225 |
| 50 | 32 | 2″ | 78 | 115 | 2 1/2″ | 234 |
| 65 | 40 | 2 1/2″ | 110 | 140 | 3″ | 370 |
| 80 | 50 | 3″ | 110 | 156 | 4″ | 370 |
* R = Inlet thread size; G = Outlet thread size; d0 = Throat diameter; L = Face-to-face length; L1 = Overall length; H = Overall height.
Applicable Media
Water
Air
Nitrogen-Hydrogen Mixed Gas
Non-Corrosive Media
Corrosive Media (A28Y-P/R)
A28H Spring Full Lift Safety Valve with Lever — Product Image
A28H Spring Full Lift Safety Valve with Lever — Structure Diagram
Request a Quote
Need a high-capacity threaded safety valve with manual test lever for your steam, water, or air system? Gaoshan Valve offers the A28H series in pressure classes from PN10 to PN64, DN15–DN80, with both standard and corrosion-resistant (A28Y-P/R) configurations. Contact us today for competitive pricing, technical consultation, and fast delivery.