Pig inlet &outlet and oil (air or water) inlet shall be connected respectively to the main pipe by valves.
Pig inlet &outlet and oil (air or water) inlet shall be connected respectively to the main pipe by valves.
收发球口和进油（气、水）口分别通过阀门与主管线连接。
Pig inlet &outlet and oil (air or water) inlet shall be connected respectively to the main pipe by valves.
收发球口和进油（气、水）口分别通过阀门与主管线连接。