1. Name of product:
Double gate valve, also known as check valve, is one of accessories for preventing oil pipeline liquid reflux when a fuel tanker shutdown. Connection type: thread NPT 1/2 ", flow range: 0-60 liters / minute, shut off the valve speed: 0.5S, the use of medium: gasoline, diesel, kerosene, the use of the environment: -30 ℃ ~ +55 ℃.

2. Structure and working principle:
The suction pipe on the valve body connected with fuel oil tankers, when the fuel gas motor starting, inhaled the formation of vacuum tube, the body side of the pressure is higher than the upper valve body side impact pressure; valve differential pressure in the next up, the oil suction pipe can enter the oiling machine, when the motor stops working, on the body cavity negative pressure disappeared, and the oil pressure variable is positive pressure, the valve automatically closes in positive pressure, the oil does not fall. As a result of the check valve with two sets of the same valve and valve, check valve performance more reliable.

3. Notes for installation and use:
3.1 the assembly should remove the plastic protection sleeve, the valve flap on the clean, tighten the mating parts, and need to put the screen to avoid inhaling dirt.

3.2 the valve body and valve sealing pay is precision ground, so the assembly, not up and down on, do not use with other valve on the check, so as not to reduce the performance. But confusion, available ink color check, and the original grinding marks should be coincidence.

4. Technical parameter of product: