Abstract: A reciprocating pump capable of reducing its overall size by suppressing the size of an entire drive unit. A plurality of piston parts move in the same direction and draw fluid into a plurality of pump chambers and discharge the fluid. The pump chambers are adjacent to each other. A motor has a drive shaft between the centers of piston parts located at both ends in the installation direction of the pump chambers and oriented in a direction substantially orthogonal to the installation direction of the pump chambers and substantially orthogonal to the moving direction of the piston parts. A plurality of cams are aligned adjacent each other in the axial direction on the motor drive shaft. The cams are linked to the piston parts so that the cams cause the reciprocal movement of the piston parts.

Abstract: Disclosed is a check valve reliably closing a fluid path without the need of machining with high accuracy. The check valve includes a pair of members with clamping surfaces; and a valve body clamped by the clamping surfaces from both sides in a thickness direction of the valve body. The valve body is formed from an elastic body and includes an outer frame, a sealing part arranged inside the outer frame and configured to open and close a fluid path formed in one of the pair of members, and a coupling part configured to allow fluid to pass therethrough in the thickness direction and configured to couple the outer frame and the sealing part to each other. The outer frame has a thickness larger than an interplane dimension between the clamping surfaces when the pair of members are joined together.

Abstract: A pump is provided having a communication portion that provides continuous communication between a pump section and a discharge section in a state where a discharge-side check valve suppresses a backflow, and a size of the communication portion is set so that, when the continuously expanding and contracting pump section contracts, a volume of gas mixed in liquid in the pump section is contracted.

Abstract: Provided is a diaphragm that can be securely and firmly fixed to a predetermined fixing position without deteriorating the function of a film part. The diaphragm is provided with a film part (1a) that is elastically deformable by a predetermined pressure, a thick part (1b) that is disposed at a rim portion of the film part (1a) and has a thickness greater than the film part (1a), and a protection part (1d) that is disposed between the film part (1a) and the thick part (1b) in contact with the film part (1a) and is elastically deformable along with elastic deformation of the film part (1a) to protect the film part (1a).

Abstract: Provided is a diaphragm that can be securely and firmly fixed to a predetermined fixing position without deteriorating the function of a film part. The diaphragm is provided with a film part (1a) that is elastically deformable by a predetermined pressure, a thick part (1b) that is disposed at a rim portion of the film part (1a) and has a thickness greater than the film part (1a), and a protection part (1d) that is disposed between the film part (1a) and the thick part (1b) in contact with the film part (1a) and is elastically deformable along with elastic deformation of the film part (1a) to protect the film part (1a).

Abstract: In a reciprocating pump, drive power of a drive-power supply member is transmitted to a diaphragm within a diaphragm drive chamber via operating fluid. An operating-fluid-flow regulation chamber for regulating the flow of operating fluid is located between the drive-power supply member and the diaphragm drive chamber. A first gas discharge member and a second gas discharge member are respectively located in an upper part of the inside of the operating-fluid-flow regulation chamber and an upper part of the inside of the diaphragm drive chamber. The first gas discharge member is held in fluid communication with the second gas discharge member so as to constitute a single gas discharge mechanism. This single gas discharge mechanism is provided with a reverse-flow prevention member for preventing a reverse flow of fluid from the first gas discharge member to the second gas discharge member.

Abstract: In a reciprocating pump, drive power of a drive-power supply member is transmitted to a diaphragm within a diaphragm drive chamber via operating fluid. An operating-fluid-flow regulation chamber for regulating the flow of operating fluid is located between the drive-power supply member and the diaphragm drive chamber. A first gas discharge member and a second gas discharge member are respectively located in an upper part of the inside of the operating-fluid-flow regulation chamber and an upper part of the inside of the diaphragm drive chamber. The first gas discharge member is held in fluid communication with the second gas discharge member so as to constitute a single gas discharge mechanism. This single gas discharge mechanism is provided with a reverse-flow prevention member for preventing a reverse flow of fluid from the first gas discharge member to the second gas discharge member.

Abstract: A control circuit of a solenoid actuated pump includes an energizing means for energizing a solenoid of the solenoid actuated pump, a detecting means for detecting the electrical energy of a power supply for supplying the electrical energy to the energizing means, and a processing unit for comparing the value of the electrical energy detected by the detecting means with a predetermined value to be supplied to the solenoid and supplying a control signal to the energizing means so as to adjust the detected value of the electrical energy to the predetermined value.

Abstract: A pneumatically driven bellows pump includes a bellows that is reciprocable by a driving force effected by air. The bellows has an integral form of a bellows body, an expansion portion and a mounting portion. The mounting portion includes a threaded member, through which the bellows is brought into threaded engagement with a threaded member formed in a pump-driving member in such a manner as to seal the bellows.