Vacuum Negative Pressure Safety Valve Manufacturers – Vacuum Pressure Protection
When vacuum exceeds the allowable limit, the valve automatically opens to admit air, restoring pressure balance and preventing structural damage . This article provides essential information on manufacturers and key selection parameters for vacuum relief valves.The main safety valve product names of China safety valve Network include:Quick Switching Safety Valve,Spring Low Lift Safety Valve,Spring Low Lift High Pressure Safety Valve,Spring Low Lift Closed High Pressure Safety Valve,Spring Fall Lift Closed High Pressure Safety Valve,Thermal Power Station Used Non-standard Safety Valve,Ultra-high Pressure Safety Valve,Vacuum Negative Pressure Safety Valve,Water Heater Safety Valve,YD Type Bursting Disc.
Understanding Vacuum Relief Valve Function
Vacuum relief valves protect against negative pressure conditions that can occur during liquid withdrawal, thermal cooling, or steam condensation after cleaning . When internal pressure drops below the set vacuum point, the valve opens to admit air or blanketing gas, preventing tank shell collapse . Once the vacuum returns to safe levels, the valve automatically reseats .
Leading Manufacturers
Chaoda Group offers YFA72W vacuum negative pressure safety valves for systems up to 200°C. Their valves feature spring-loaded full-lift design with recoil disc, achieving discharge capacity 4-5 times that of equivalent breather valves. The spring is isolated from media to prevent corrosion failure .
Motherwell Tank Protection manufactures ATEX-approved vacuum relief valves in sizes from 2″ to 12″ (50mm to 300mm), available in aluminum, carbon steel, and stainless steel. Their valves are designed specifically for tank protection with only negative pressure management required .
Protectoseal offers vacuum relief vents designed and manufactured to API Std 2000 and EN ISO 28300 standards, with sizes from 2″ to 12″ and air-cushioned sealing technology that prevents emission losses until very close to set vacuum .
Zhejiang Shengqi Technology produces pilot-operated vacuum relief valves for oil, petrochemical, and natural gas industries, designed to protect tanks against rupturing or imploding under normal pump in/out and thermal breathing conditions .
Technical Specifications
Typical specifications for vacuum relief valves include sizes from DN15 to DN300, vacuum set points from -0.03 to -6.96 psi (-2 to -480 mbar), and temperature ranges from -40°C to +200°C . Body materials include carbon steel, 304/316 stainless steel, and aluminum. Connection types include flanged and threaded ends .
Selection Considerations
When specifying a vacuum relief valve, determine the required vacuum set point and flow capacity based on API 2000 sizing calculations . Select spring-loaded or weight-loaded design based on required vacuum relief range. For sanitary applications in food, beverage, and pharmaceutical industries, specify stainless steel construction with polished surfaces . Consider flame arrestor compatibility for flammable vapor service.
Summary
Vacuum negative pressure safety valves are essential for protecting storage tanks and process equipment from vacuum-induced collapse. Manufacturers such as Chaoda Group, Motherwell, Protectoseal, and Shengqi offer certified vacuum relief valves meeting API 2000 and ATEX standards. Selection requires careful evaluation of vacuum set point, flow capacity, and material compatibility based on specific system requirements. Consulting with qualified manufacturers who provide certified performance data is strongly recommended for critical vacuum protection applications.
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