Product Catalog
Breathing Valve
Breather Valve is a safety and energy-saving accessory installed on the top of atmospheric / low-pressure storage tanks. It consists of a pressure relief valve (outbreathing) and a vacuum relief valve (inbreathing). It maintains balanced air pressure inside and outside the tank to avoid tank bulging caused by overpressure and tank collapse caused by negative pressure, while lowering volatile loss of stored medium.
- Parameters
- Drawing
- Application areas
Working Principle
Positive pressure exhaust: When the internal tank pressure exceeds the set positive pressure, the pressure valve disc opens, oil and gas inside the tank are vented out, and the pressure drops back to normal.
Negative pressure intake: When the internal tank pressure falls below the set negative pressure, the vacuum valve disc opens, external air flows into the tank, and the pressure rises back to normal.
Sealed standby state: Under normal pressure, the valve discs are sealed by self-weight or spring force to isolate the tank from the atmosphere and reduce volatile loss.
Applicable Standards
SY/T 0511.1-2024, Vertical Cylindrical Steel Welded Storage Tank Accessories — Part 1: Breather Valves
API Standard 2000, Venting of Atmospheric and Low-Pressure Storage Tanks(Standard for High-Flow Breather Valves)
Product Features
Low opening-closing differential pressure; the lift height can reach at least 1/3 of the nominal diameter of the breather valve.
Adopts high-quality springs with excellent anti-fatigue performance.
A variety of optional materials are available for valve seat and valve plug manufacturing, suitable for diverse working conditions.
Both valve plug and valve seat assemblies are field-replaceable.
Certified discharge curves applicable to all product sizes.
Flange standards can be selected as per customer requirements (GB, HG, ANSI, DIN, GOST).
Parameter
| Parameter Item | Standard Value | Optional / Remarks |
|---|---|---|
| Nominal Diameter | DN50 ~ DN400 | Common sizes: DN80/100/150/200 |
| Type | All-weather breather valve, exhale nozzle type, inhale nozzle type, dual nozzle type | Select according to medium type |
| Standard Model | API 2000 type, Model 0511 | API 2000 is international high-flow type |
| Set Pressure | Exhale: Max. 100 kPa / Inhale: Min. -3 kPa | Conventional values |
| Housing Material | Carbon Steel (Q235, WCB), 304 Stainless Steel, 316L Stainless Steel, Aluminum Alloy, Steel lined with PTFE | 316L is selected for anti-corrosion service |
| Disc Material | Aluminum Alloy, 304 Stainless Steel, 316L Stainless Steel | Light weight, excellent sealing performance |
| Sealing Elements | PTFE, FKM (Fluoroelastomer) | Oil resistance & solvent resistance |
| Flange Standard | Flanges compliant with GB, HG, ANSI, DIN, GOST | Non-standard customization available |
| Optional Accessories | Flame arrestor function, heat tracing function | Select according to medium characteristics |
| All data above are for reference only. Please contact us for detailed parameters. | ||
