Pressure Vacuum Relief Valve Manufacturer

Pressure Vacuum Relief Valve

Product Introduction

For closed vessels and storage tanks containing liquid media, pressure control is a key factor in ensuring safe operation. To build a solid safety barrier, overpressure and vacuum conditions generated inside the tank must be released and regulated in a timely and reliable manner.

BasCo breather valves are precisely designed to meet the pressure control requirements of various vessels and storage tanks. Whether using gravity-loaded or spring-loaded structures, they provide strong support for stable tank pressure control and serve as key components in tank safety systems.

For overpressure and vacuum problems caused by tank filling and discharge, steam purging, thermal breathing, and other operating conditions, BasCo breather valves can provide customized solutions. BasCo can supply breather valves, pressure-only valves, and vacuum-only valves according to specific requirements, fully meeting pressure regulation needs under different operating conditions. They also help effectively control emissions and minimize product loss.

BasCo breather valves are designed in accordance with international and domestic standards such as SY/T0511 and API2000-2020. They have obtained qualification certificates including ATEX, EAC, DNV, TS, CCS, and type test certificates. Over the years, they have been trusted by customers in many industries, including oil and gas production, refining and petrochemical, chemical production, pharmaceuticals, and bioenergy.

BasCo breather valve products ensure the safe, efficient, and continuous operation of complete systems through stable performance. With advanced design, efficient pressure control capability, and reliable quality, BasCo breather valves have gained wide market recognition and become a preferred brand in the field of industrial tank safety.

Features of BasCo Breather Valves

Ultra-Large Flow Capacity

With a large flow passage area and a unique valve body flow channel design, the valve can quickly balance the pressure difference inside the tank while optimizing the flow area. It rapidly stabilizes pressure fluctuations, prevents overpressure and vacuum conditions, ensures efficient and stable operation, and is suitable for various large-capacity storage facilities.
10% Overpressure Technology

The advanced 10% overpressure opening technology provides sensitive response, excellent pressure stabilization, and outstanding sealing performance. It effectively reduces medium evaporation loss, fully protects tank operation safety, and is suitable for various tank operating conditions with practical, durable, and stable performance.
Ultra-Low Leakage

The leakage rate of BasCo breather valves is far lower than the API2000 standard and strictly complies with the ultra-low leakage test requirements of SY/T0511. They also ensure accurate opening pressure and effectively solve the problem of fugitive VOCs emissions in tank farms.
Modular Design for Easy Maintenance

BasCo breather valves adopt a modular design, allowing easy assembly and disassembly. Maintenance and seal replacement can be completed without special tools. Each module is equipped with lifting lugs for accurate installation and positioning. Flange connections are compatible with various storage tank and equipment interfaces, effectively reducing installation and maintenance costs.
Wide Application Range

A variety of options are available, including gravity-loaded valves, spring-loaded valves, and pilot-operated breather valves. They are suitable for different pressure stages, with maximum positive pressure up to 100 kPa.
Self-Draining Valve Body

The no-water-accumulation valve body design helps prevent moisture and rust inside the valve, ensuring tight sealing, sensitive opening and closing, long service life, and easy maintenance.
Strong Compatibility

They are compatible with different flange standards such as ANSI, DIN, and JIS, allowing seamless connection with existing pipeline systems and quick deployment without additional modification.

Main Application Industries

BasCo breather valve products have built a strong reputation in design, manufacturing, and supply, and are widely used in industries such as oil and gas, petrochemical, biofuels, mining, pharmaceuticals, and power generation.

Product Model

5100 End-of-Line Pressure Vacuum Relief Valve

Leakage is much less than API2000 standard and maintains high setting accuracy (±3%).
Dual guide rail system, smooth stroke and less wear
Full start at 10% overpressure
Valve core and valve seat assembly can be replaced on site
Supports ANSI, DIN, and HG/T20592~20635~2009 flanges
5200 In-Line Pressure Vacuum Relief Valve

Dual guide rail system , smooth stroke and less wear
Leakage is much less than API2000 standard and maintains high setting accuracy(±3%)
Full start at 10% overpressure
Valve core and valve seat assembly can be replaced on site
Supports ANSI, DIN, and HG/T20592~20635~2009 flanges
5300 Pressure Relief Valve

Double guide rail system, smooth stroke and less wear

The leakage is much lower than API2000 standard and guarantees high setting accuracy (±3%)

Full open at 10% overpressure

The trim and seat assembly can be replaced on site

Supports ANSI, DIN, and HG/T20592~20635~2009 flanges.
5400 Vacuum Relief Valve

Double guide rail system, smooth stroke and less wear
Leakage is much lower than API2000 standard and guarantees high setting accuracy (±3%).
Full open at 10% overpressure
The trim and seat assembly can be replaced on site
Supports ANSI, DIN and HG/ T20592-20635-2009 flanges
5500 Pilot-operated Pressure Vacuum Relief Valve

High sealing performance
Fully open at 10% overpressure
5600 End-of-line Pressure Vacuum Relief Valve with Integrated Flame Arrester

Good corrsion resistance,chemical resistance,resistance to adhesion of liquid and vapor,resistance to extreme temperature
Fully open at 10% overpressure
The leakage is much smaller than API2000 standard and ensures a higher setting accuracy(±3%)
Supports ANSI, HG/T flanges
The valve trim assembly can be replaced on site
5660 Liquid-Seal Pressure/Vacuum Relief Valve (Hydraulic Safety Valve)

High setpoint accuracy: Setpoint accuracy is ±3% across the full range, with smooth, chatter-free operation and stable pressure control.
Automatic overflow level control: The overflow structure maintains the liquid level within the operating range, reducing manual replenishment and keeping the seal stable.
Visible liquid level: A level gauge lets operators check the seal liquid directly during inspections.
Optional flame arrester element: An integrated flame arrester element combines venting and flame arresting to help prevent external flames from entering the tank.
Dedicated seal liquids: General-purpose, antifreeze and corrosion-resistant seal liquids are available for different media and temperatures.
5800 In-line Pressure Vacuum Relief Valve with Integrated Flame Arrester

Good corrsion resistance,chemical resistance,resistance to adhesion of liquid and vapor,resistance to extreme temperature
Fully open at 10% overpressure
The leakage is much smaller than API2000 standard and ensures a higher setting accuracy(±3%)
The valve trim assembly can be replaced on site
Supports ANSI, HG/T flanges
Plastic Pressure Vacuum Relief Valve

The leakage is much lower than API2000 standard and guarantees high setting accuracy (±3%)
The valve trim assembly can be replaced on site
Supports ANSI, HG/T flanges