A pneumatic inlet/blowdown valve assembly for a fluid compressor system, comprising: an inlet valve wherein a working fluid enters the fluid compressor system, the inlet valve regulating a flow of the working fluid into a first air-end of the fluid compressor system, a blowdown valve couplable to a discharge of a second air-end of the fluid compressor system, the blowdown valve configured to release a pressure within the fluid compressor system, and a piston-cylinder actuator in communication with the inlet valve and the blowdown valve, the piston-cylinder actuator including: a first piston housed within a first cylinder, a second piston housed within a second cylinder, the first piston and the second piston axially connected by a piston shaft, the first cylinder defining a first chamber at a first side of the first piston and a second chamber at a second side of the first piston and the second cylinder defining a third chamber at a first side of the second piston and a fourth chamber at a second side of the second piston, a compression spring disposed within the fourth chamber, and the first piston and the second piston configured to be actuated between an idle state wherein the inlet valve is closed to stop the flow of the working fluid into the fluid compressor system and the blowdown valve is open to depressurize the fluid compressor system, and an actuated state wherein the inlet valve is open to allow the flow of the working fluid into the first air-end and the blowdown valve is closed to allow a pressure buildup in the fluid compressor system. an inlet valve wherein a working fluid enters the fluid compressor system, the inlet valve regulating a flow of the working fluid into a first air-end of the fluid compressor system, a blowdown valve couplable to a discharge of a second air-end of the fluid compressor system, the blowdown valve configured to release a pressure within the fluid compressor system, and a piston-cylinder actuator in communication with the inlet valve and the blowdown valve, the piston-cylinder actuator including: a first piston housed within a first cylinder, a second piston housed within a second cylinder, the first piston and the second piston axially connected by a piston shaft, the first cylinder defining a first chamber at a first side of the first piston and a second chamber at a second side of the first piston and the second cylinder defining a third chamber at a first side of the second piston and a fourth chamber at a second side of the second piston, a compression spring disposed within the fourth chamber, and the first piston and the second piston configured to be actuated between an idle state wherein the inlet valve is closed to stop the flow of the working fluid into the fluid compressor system and the blowdown valve is open to depressurize the fluid compressor system, and an actuated state wherein the inlet valve is open to allow the flow of the working fluid into the first air-end and the blowdown valve is closed to allow a pressure buildup in the fluid compressor system. a first piston housed within a first cylinder, a second piston housed within a second cylinder, the first piston and the second piston axially connected by a piston shaft, the first cylinder defining a first chamber at a first side of the first piston and a second chamber at a second side of the first piston and the second cylinder defining a third chamber at a first side of the second piston and a fourth chamber at a second side of the second piston, a compression spring disposed within the fourth chamber, and the first piston and the second piston configured to be actuated between an idle state wherein the inlet valve is closed to stop the flow of the working fluid into the fluid compressor system and the blowdown valve is open to depressurize the fluid compressor system, and an actuated state wherein the inlet valve is open to allow the flow of the working fluid into the first air-end and the blowdown valve is closed to allow a pressure buildup in the fluid compressor system.