Safety Valve – Key Advantages

A safety valve is a critical pressure relief device installed on pressure vessels, pipelines, boilers and industrial process systems. It automatically opens to discharge excess fluid (gas, liquid or steam) when internal pressure rises above the preset safe limit, and closes tightly once pressure returns to normal. It is designed to prevent equipment damage, explosions and safety accidents caused by overpressure.
Safety valves are essential safety accessories widely used in oil & gas, chemical, power generation and manufacturing industries. Working purely by mechanical pressure without external power supply, they provide reliable overpressure protection for all kinds of pressurized equipment.
When system pressure exceeds the rated value, the valve disc lifts to release redundant medium and lower pressure. After the pressure drops back to the safe range, the valve closes and maintains a tight seal. As a standard safety device complying with API, ASME and ISO codes, safety valves protect personnel, facilities and the whole production system from overpressure hazards.

Spring-Loaded Safety Relief Valves are designed for critical overpressure protection in power plant boilers, pressure vessels, temperature-reducing equipment, and other industrial systems. Their core function is to automatically relieve excess pressure and prevent system overpressure beyond the maximum allowable value, ensuring the safe operation of equipment at all times.

Our steam safety valves are engineered to meet the most stringent industry standards:

Sizing and selection: per API 520 (ASME Sec. VIII)
Design: per API 526
Testing: per API 527 (ASME PTC 25)
Flange dimensions: per ASME B16.5

Available configurations include:

A48C Open Bonnet Plain Lever Safety Valve
A48Y High-Temperature High-Pressure Safety Valve with Radiator
High-Performance Steam Safety Valve (compliant with ASME Sec. I requirements)
High-Temperature High-Pressure Welded Safety Valve

Key Features

Open bonnet design with radiator for high-temperature applications
Angle-type safety relief valve
Low-lift / full-lift configurations for high-temperature and high-pressure service, with metal-to-metal seating and optional lever
Inlet connections: Flanged per ASME, DIN, JIS, BS, or other regional standards
Outlet connections: Flanged per ASME, DIN, JIS, BS, or other regional standards

Item	Details
Size Range	1/2″ – 16″ (DN20 – DN400)
Pressure Rating	Class 150 – Class 600 / PN10 – PN100
Temperature Range	-20°C ~ 350°C
Body Material	WCB, WC6, WC9, CF8, CF8M
Disc Material	2Cr13, 304, 316
Stem Material	2Cr13, 304, 316
Spring Material	50CrVA, 50CrVA with PTFE coating
End Connections	Flanged (FF, RF, RJ); Butt weld per ASME B16.25 / GB/T 12224
Flange Standards	ASME, DIN, JIS, BS, or equivalent
Structure Style	Spring-loaded, angle pattern, open bonnet
Actuator Options	Lever-operated
Design Standard	API RP 520
Face-to-Face Standard	API 526
Test Standard	API 527

Our new-structure pilot operated safety valves are widely used in petroleum, natural gas, chemical, power, metallurgy and fuel gas industries. They serve as ideal overpressure protection devices for pressurized equipment, vessels and pipelines.

Different from spring-loaded types, this valve adopts a pilot valve to control the main valve indirectly. The main valve is designed with a sleeve piston and double sealing seat. It delivers outstanding performance: high actuation accuracy, excellent repeatability and fast reseating capability. The valve features reliable tight shutoff even under high pressure, long service life and superior operational safety. It supports on-site readjustment, automatically reseats after repeated relief operations, and is easy to operate and maintain.

Key Features

New structure pilot operated safety valve, suitable for petroleum, natural gas, chemical, power, metallurgy and fuel gas sectors
Premium overpressure protection for pressurized equipment, vessels and pipelines
Pilot valve controls main valve indirectly for stable performance
Main valve with sleeve piston and double sealing seat
High precision, good reusability and fast reseating speed
Excellent sealing performance against high-pressure leakage
On-line adjustment available; automatic reseating after multiple relief cycles
Durable, safe, simple operation and convenient maintenance

Item	Details
Size Range	1″ – 8″ (DN25 – DN200)
Body Material	WCB, LCB, CF8, CF8M, CF3M
Pressure Rating	Class 150 – Class 900 / PN16 – PN160
Disc Material	304+F46, 316+F46, Monel+F46, 316L+F46
End Connection	Flange (FF, RF, RJ); Butt weld
Spring Material	316, Inconel
Structure Style	Pilot operated, angle type
Stem Material	A182 F6a, 304, 316, 17-4PH, F11
Actuator Type	Pilot operated
Temperature Range	-196℃ ~ 650℃
Design Standard	API RP 520
Face-to-Face Standard	API 526
Connection Standard	Flange: ASME B16.5, ASME B16.47, GB/T 9113, JB/T 79 Butt weld: ASME B16.25, GB/T 12224
Test Standard	API 527

Spring-loaded safety relief valves rely on spring tension to keep the disc tightly sealed against the nozzle. When abnormal overpressure occurs inside the equipment, the medium pushes the disc upward to open the valve and release excess pressure.

These valves are divided into full-lift and low-lift types based on opening stroke. Full-lift models deliver large discharge capacity for both liquid and gas media, while low-lift designs are specially suitable for liquid service.

Key Features

Low lift & full lift designs available
Enclosed bonnet construction
Metal-to-metal seating, standard design for liquid media
Flanged ends compliant with ASME, DIN, JIS, BS and other international standards

Item	Details
Size Range	1/2″ – 16″ (DN20 – DN400)
Body Material	WCB, CF8, CF8M
Pressure Rating	Class 150 – Class 1500 / PN10 – PN250
Disc Material	2Cr13, 304, 316
End Connection	Flange (FF, RF, RJ)
Spring Material	50CrVA, 50CrVA with PTFE coating
Structure Style	Spring loaded, open / enclosed bonnet, angle type
Stem Material	2Cr13, 304, 316
Actuator Options	With or without lever
Temperature Range	-60℃ ~ 200℃
Design Standard	API RP 520
Face-to-Face Standard	API 526
Flange Standard	ASME, DIN, JIS, BS etc.
Test Standard	API 527

Threaded pressure relief valves are applicable to equipment and pipelines conveying air, ammonia and petroleum, with a maximum operating temperature of 200℃.

Spring-loaded low-lift threaded safety relief valves: Suitable for systems carrying water, air and steam (operating temperature ≤ 200℃).
Spring-loaded full-lift threaded safety relief valves: Designed for media including air, steam, water and nitrogen-hydrogen mixed gas (operating temperature ≤ 200℃).

Key Features

Angle type safety / pressure relief valve
Low-lift design, available with metal-to-metal seating or soft seal
Threaded end connections

Bellows balanced safety valves are a type of spring-loaded safety relief valve fitted with a bellows component. This design effectively minimizes the impact of outlet back pressure and shields the spring chamber from corrosive or contaminated discharged media.

Our bellows balanced safety relief valves are widely applied in chemical plants, petrochemical facilities, pressure vessels, flare headers and general discharge systems, especially for working conditions with corrosive outlet media. We provide professional selection support covering set pressure, certified relief capacity, back pressure assessment, bellows material selection, discharge piping design, seat tightness and relevant technical documentation.

Safety Valve

Safety Valve – Key Advantages

Automatic Overpressure Protection

Reduced Operational & Maintenance Costs

Reusable & Long-Lasting Performance

Compliance with Industry Standards

Environmental & Personnel Safety

Versatility Across Applications

Spring Loaded Safety Valves

Key Features

Pilot Operated Safety Valve

Key Features

Safety Pressure Relief Valve

Key Features

Thread Pressure Relief Valve

Key Features

Bellows Balanced Safety Valve