1. The hydraulic breather valve is a safety backup device for the (flap-type) breather valve. Its suction and exhaust action pressures are slightly higher than those of the (flap-type) breather valve. In the event of a malfunction of the breather valve or when its flap freezes in winter, the hydraulic safety valve's liquid seal is destroyed, thereby protecting the oil tank from damage.

 

2. The hydraulic safety valve is installed on the top of the oil tank and used in conjunction with the breather valve.

 

3. Control pressure: +56mm to -50mm water column.