Hydraulic fluid-conducting circuit containing flow-through cylinders

A hydraulic fluid-conducting circuit for maintaining hydraulic fluid in a flowable condition during cold weather comprising:

• a fluid source;
• a selected fluid flow path connected to and from said fluid source in a continuous path;
• a fluid pump in said fluid flow path for continuously circulating fluid in said continuous path to maintain fluid flowability during the existence of temperatures that would otherwise significantly reduce the fluid flowability;
• a fluid pressure load responsive element in the fluid flow path having a fluid entrance and a fluid exit such that fluid in the flow path can flow through the load responsive element;
• and
• a fluid flow control device in said fluid flow path connected to said fluid exit of said fluid pressure responsive element to selectively decrease fluid flow through said fluid flow control device and cause a pressure build up in and operation of said fluid pressure responsive element.