Pipe Plug Male Internal Hex Thread Male Plug

2、Hydraulic system＆Pipe Plug Male Internal Hex Thread Male Plug

In the hydraulic system, the function of the Pipe Plug Male Internal Hex Thread Male Plug is quite simple: to block the hydraulic oil ports that are not in use at the moment or may be used in the future, preventing the oil from leaking out and keeping dirt from entering.

【1】In which parts of the hydraulic system will it be used?

（1）Hydraulic valve block: On the valve block, there are many machined oil channels. Some of them are process holes, while others are backup pressure measurement ports or interfaces for connecting oil pipes.

（2）Hydraulic pump station: The spare interface on the oil tank cover, or the inspection port on the pump body.

（3）Hydraulic cylinder: The exhaust port and buffer oil port on the cylinder barrel should be sealed with Pipe Plug Male Internal Hex Thread Male Plug when not in use.

（4）Construction machinery hydraulic system: Hydraulic pipelines for excavators, loaders, and forklifts, which need to be disassembled and reassembled frequently during maintenance or debugging.

（5）Hydraulic test point: The place where the pressure gauge is temporarily connected. After measuring the pressure, remove the gauge head and immediately screw on the plug to protect the interface.

【2】Why use this kind of internal hexagonal screw instead of the external hexagonal one?

（1）Space is limited: The oil ports on the hydraulic valve block and the oil cylinder are often located in hard-to-reach corners, and the socket wrench cannot fit in. The internal hexagon nut only requires a small wrench, which is much more convenient.

（2）The head is not protruding: In some areas, the oil ports are recessed. The hexagonal nuts will protrude and may interfere with subsequent operations. The internal hexagonal nuts can be fully sunk in, with a smooth surface.

【3】What are the specific requirements for the Pipe Plug Male Internal Hex Thread Male Plug in the hydraulic system?

（1）Resistant to high pressure: The hydraulic system can generate pressures of 200-300 bar, or even higher. The NPT conical thread combined with the putty tape or thread sealant can withstand such pressure.

（2）No oil leakage: During installation, make sure to tightly wrap the raw material tape (3 to 6 layers) or use liquid thread sealant.

（3）Anti-vibration performance: Construction machinery is often exposed to high-frequency vibrations. Ordinary conical threads may loosen. Generally, it is recommended to apply thread locking adhesive on the threads of the Pipe Plug Male Internal Hex Thread Male Plug to prevent loosening.