Humor

https://www.inno-valve.com/products/hydraulic-counterbalance-valve/

Pilot-assited valve opening flow control is provided by a counterbalance valve. It provides load control and maintenance functions when used in conjunction with a remote control source. The counterbalance valve series includes standard and restrictive types. One-way, relief, and pilot-operated restriction are the functions of restrictive type and standard type counterbalance valve in hydraulic system.