A piston of an air compressor contains at least one fixing bolt configured to fix a plane of a top of a head of the piston in at least one air stop sheet. A respective one air stop sheet includes at least one bending section, an acting zone configured to close at least one air orifice of the head. The head has at least one receiving groove configured to receive a spring, the spring abuts against the respective one air stop sheet, and the acting zone of the respective one air stop sheet backing a top of a cylinder turns on relative to the plane of the head at the open angle θ, thus producing the air flowing space. The air flowing space is in communication with the at least one air orifice so that a pressure of the cylinder balances with atmosphere.

A repair system for a vehicle includes a base and a lift component movably secured to the base for lifting a portion of a frame of the vehicle. An air compressor unit is disposed on the base and has a discharge hose configured to be selectively connected to the tire for delivering compressed. A sealant reservoir is disposed on the base and filled with a flat tire sealant. The discharge hose is optionally configured to deliver the flat tire sealant to the tire. A controller is disposed on the base and receives tire data from the vehicle and controls discharge of the compressed air from the air compressor unit to the tire and optionally controls discharge of the flat tire sealant to the tire based on the tire data. The tire data includes a tire pressure reading associated with the tire.

A compression unit including at least one volumetric compressor for compressing the air drawn from the external environment, a system for drying the compressed air operatively associated to the at least one volumetric compressor, one tank for storing the compressed air delivered from the at least one volumetric compressor, wherein the drying system comprises a unit for cooling the compressed air positioned downstream of and placed in fluid communication with the tank, and one dryer positioned upstream and placed in communication with the cooling unit, the dryer configured to reduce the moisture content present in the compressed air that can be dispensed by the compression unit, one solenoid valve positioned upstream of the dryer, to shut off the flow of compressed air flowing out from the tank, and a differential pressure switch to control the switching of the solenoid valve.

A compression unit including at least one volumetric compressor for compressing the air drawn from the external environment, a system for drying the compressed air operatively associated to the at least one volumetric compressor, one tank for storing the compressed air delivered from the at least one volumetric compressor, wherein the drying system comprises a unit for cooling the compressed air positioned downstream of and placed in fluid communication with the tank, and one dryer positioned upstream and placed in communication with the cooling unit, the dryer configured to reduce the moisture content present in the compressed air that can be dispensed by the compression unit, one solenoid valve positioned upstream of the dryer, to shut off the flow of compressed air flowing out from the tank, and a differential pressure switch to control the switching of the solenoid valve.

In one embodiment, an agricultural implement system includes a row unit, the row unit configured to dispose seed into a ground trench, and closing system corresponding to the row unit, the closing system configured to close the ground trench after disposition of the seed. The agricultural implement system further includes a double acting cylinder mechanically coupled to the closing system, the double acting cylinder comprising a cylinder side port and a rod side port and a fluid source fluidly coupled to the cylinder side port and configured to provide a cylinder side fluid. The agricultural implement system additionally includes a filter fluidly coupled to the rod side port. Filtered fluid enters the double acting cylinder via the rod side port.

In one embodiment, an agricultural implement system includes a row unit, the row unit configured to dispose seed into a ground trench, and closing system corresponding to the row unit, the closing system configured to close the ground trench after disposition of the seed. The agricultural implement system further includes a double acting cylinder mechanically coupled to the closing system, the double acting cylinder comprising a cylinder side port and a rod side port and a fluid source fluidly coupled to the cylinder side port and configured to provide a cylinder side fluid. The agricultural implement system additionally includes a filter fluidly coupled to the rod side port. Filtered fluid enters the double acting cylinder via the rod side port.

A pressure adjustment apparatus including a pump, a selector valve coupled to the pump, and a chamber in selective fluid communication with the pump through the selector valve is disclosed. The pump includes a pump body that defines a variable volume therein, the pump body further defining a first aperture and a second aperture therethrough. The selector valve includes a first check valve disposed in a first fluid channel of a plurality of fluid channels, the first check valve being oriented to permit flow through the first fluid channel only in a first flow direction, the first flow direction being a flow direction out of the variable volume, and a second check valve disposed in a second fluid channel of the plurality of fluid channels, the second check valve being oriented to permit flow through the second fluid channel only in a second flow direction.

A cordless compressor has an air storage tank, a pump for pressuring air within the air storage tank, a motor driving pump, a power tool battery pack connected to the motor, a discharge port connected to the air storage tank, and a regulator disposed between the discharge port and the air storage tank. The pump can raise the air pressure within the air storage tank from 0 psi to about 135 psi in less than 135 seconds. With such arrangement, a compressor having an air pressure within the air storage tank of 135 psi set at a 70 psi setting can power an 18 gauge nailer connected to the compressor to drive more than 1200 nails on a single battery charge.

A cordless compressor has an air storage tank, a pump for pressuring air within the air storage tank, a motor driving pump, a power tool battery pack connected to the motor, a discharge port connected to the air storage tank, and a regulator disposed between the discharge port and the air storage tank. The pump can raise the air pressure within the air storage tank from 0 psi to about 135 psi in less than 135 seconds. With such arrangement, a compressor having an air pressure within the air storage tank of 135 psi set at a 70 psi setting can power an 18 gauge nailer connected to the compressor to drive more than 1200 nails on a single battery charge.

A method for operating an electric air compressor assembly. The assembly includes an electric motor and a compressor which is mechanically coupled to the electric motor and which is capable of providing compressed air to a tank The method comprises monitoring the temperature of at least one component of the electric air compressor assembly and controlling the motor speed as a function of said temperature running the motor at a first speed S1, which results in the temperature increasing; when the temperature reaches a temperature threshold, which is lower than a maximum admissible temperature, running the motor at a second speed S2>S1 until a predetermined desired pressure in the tank is reached.