Valve lift arm

A valve lift arm comprising:

• a main body defining an arm structure for a valve,
• a trigger engagement structure defined at one end of the main body,
• a valve engagement structure defined at a distal end of the main body to the trigger engagement structure,
• the valve engagement structure providing a vertical pivot connection to the valve and facilitating operation of the valve through vertical motion of the distal end of the main body,
• a pivot structure which divides the main body into a valve part which incorporates the valve engagement structure and a trigger part which incorporates the trigger engagement structure,
• the pivot structure including an axle which allows rotational motion of the trigger part relative to the valve part, the allowed rotational motion having a horizontal or lateral component, and
• wherein the axle of the pivot structure is angled at an angle ranging between 20°-45° relative to a horizontal plane when the valve part has a horizontal orientation.