Shut-off valve

A hydraulic motor system, comprising:

• a first valve, for controlling the flow of hydraulic fluid therethrough;
• a hydraulic motor;
• a supply line and a return line for the supply and return of hydraulic fluid to and from the hydraulic motor;
• a case drain line, from the hydraulic motor, in fluid communication with the return line,
• a first control line in fluid communication with a first control port of the hydraulic motor and the first valve;
• and
• a second control line in fluid communication with a second control port of the hydraulic motor and the first valve
• wherein the first valve comprises:
• a substantially cylindrical sleeve;
• a spool within the sleeve and arranged for linear motion along a first axis, the sleeve and the spool being coaxial along the first axis;
• wherein the sleeve comprises:
• a first fluid flow port for receiving hydraulic fluid from the supply line;
• a second fluid flow port for supplying hydraulic fluid to a second valve for control of the hydraulic motor;
• a third fluid flow port for receiving hydraulic fluid from a first control line in fluid communication with a first control port;
• a fourth fluid flow port for receiving hydraulic fluid from the second control line;
• a fifth fluid flow port in fluid communication with the return line;
• wherein the first valve is arranged to be actuated to move the spool between a first position and a second position, wherein when the spool is in the second position, the fifth fluid flow port is in fluid communication with the second, third and fourth fluid flow ports and the first fluid flow port is closed by the spool.