Leveling valve apparatus for controlling vehicle cab leveling

A leveling valve apparatus for leveling a vehicle cab, comprising:

• a valve body;
• a piston disposed within said valve body and connected to a lever external to said valve body, wherein movement of the lever corresponds to changes in level of the vehicle cab;
• a spool extending from said piston, said spool opening and shutting a discharge valve by spacing and engaging, respectively, the valve and a valve seat thereof in accordance with upward and downward movement of said piston;
• a slider valve provided on a periphery of said spool and moving up and down along an axis of said spool to shut or open discharge passages located inside said spool;
• an air compressor working in accordance with upward and downward movement of said piston, such that shifting said slider valve shuts discharge passages and provides external air to an operation chamber formed by said slider valve, where said slider valve has a spring working after upward movement of said piston to reposition said slider valve;
• a safety valve exhausting air externally from the operation chamber when air pressure in the chamber exceeds a certain value;
• and
• said valve body having an exhaustion duct and a suction duct disposed therein, said exhaustion duct having a smaller diameter than said suction duct and discharging air flowing into said operation chamber.

A leveling valve apparatus for controlling a vehicle cab level having a lever corresponding to the vehicle cab level, a piston responding to the movement of the lever and a spool extending from the piston to control a discharge valve in response to the upward and downward movement of the piston, the leveling valve comprising:

• a slider valve provided on a periphery of said spool to control access to discharge passages by moving up and down along an axis of the spool, where the discharge passages are located in the spool interior;
• an operation chamber formed by the slider valve;
• valve operation means for operating in accordance with upward and downward movement of the lever and of the piston and for shutting discharge passages by shifting the slider valve thereby supplying external air into the operation chamber;
• a safety valve for externally exhausting the air from the operation chamber when the air pressure in the operation chamber exceeds a certain value;
• and
• a valve body having an exhaust duct and a suction duct, said exhaust duct having a smaller diameter than that of said suction duct and discharging air flowing from said valve operation means into the operation chamber.

An leveling valve apparatus for controlling a vehicle cab level comprising:

• a lever corresponding to the vehicle cab level;
• a piston responding to the movement of the lever;
• a spool extending from the piston to control a discharge valve in response to the upward and downward movement of the piston;
• a slider valve provided on a periphery of said spool to control access to discharge passages by moving up and down along an axis of the spool, where the discharge passages are located in the spool interior;
• an operation chamber formed by the slider valve;
• valve operation means for operating in accordance with upward and downward movement of the lever and shutting discharge passages by shifting the slider valve whereby supplying external air into the operation chamber;
• a safety valve for externally exhausting the air from the operation chamber when the air pressure in the operation chamber exceeds a certain value;
• and
• a valve body having an exhaustion duct and a suction duct, said exhaustion duct having a smaller diameter than that of said suction duct and discharging air flowing from said valve operation means into the operation chamber.