Abstract: Provided is an attachment structure of a check valve that is easily attached to piping, and does not need time and effort of manufacturing. A valve casing having a collar part is attached so as to be sandwiched between a pair of flanges joined to each other through an annular seal body in an upstream side in a fluid flow direction. In this valve casing, a valve is biased in a seating direction to a valve seat through a shaft and a biasing means.

Abstract: Provided is an attachment structure of a check valve that is easily attached to piping, and does not need time and effort of manufacturing. A valve casing having a collar part is attached so as to be sandwiched between a pair of flanges joined to each other through an annular seal body in an upstream side in a fluid flow direction. In this valve casing, a valve is biased in a seating direction to a valve seat through a shaft and a biasing means.

Abstract: A pipe joint is provided that effectively accommodates a relative positional displacement between pipes, thereby allowing unfailing coupling between the pipes. The pipe joint is provided with a flexible pipe main body in a circular cylindrical shape; a pair of flanges that is provided on both ends the pipe main body, and are coupled to end portions of the first pipe and the second pipe that face each other; and a plurality of string members that couple the flanges. Each string member includes a string main body and a pair of stopping members that are provided on both ends of the string main body with a predetermined distance, and the flanges are formed in an annular shape and include a plurality of flange pieces that are separately formed, an ear portion having a coupling hole for coupling the flange pieces, a coupling bolt that couples the flange pieces, and the application bolt that couples the first pipe and the second pipe.

Abstract: A split flange is provided. The split flange may be capable of being fitted firmly around the pipe having a flexible pipe body and a flared portion formed at an end portion of the pipe body. The split flange is provided with two or more arcuate flange members and two connecting members located at both end portions of the flange members and projecting outward from outer circumferential faces thereof. The flange members may be connected to each other to form an annular structure. An operation for fitting the flange members firmly around the pipe body is carried out easily.

Abstract: A split flange is provided. The split flange may be capable of being fitted firmly around the pipe having a flexible pipe body and a flared portion formed at an end portion of the pipe body. The split flange is provided with two or more arcuate flange members and two connecting members located at both end portions of the flange members and projecting outward from outer circumferential faces thereof. The flange members may be connected to each other to form an annular structure. An operation for fitting the flange members firmly around the pipe body is carried out easily.

Abstract: A split flange is provided. The split flange may be capable of being fitted firmly around the pipe having a flexible pipe body and a flared portion formed at an end portion of the pipe body. The split flange is provided with two or more arcuate flange members and two connecting members located at both end portions of the flange members and projecting outward from outer circumferential faces thereof. The flange members may be connected to each other to form an annular structure. An operation for fitting the flange members firmly around the pipe body is carried out easily.

Abstract: An integrated circuit has a self-contained voltage control oscillation circuit wherein the oscillating frequency is controlled according to a control voltage; The circuit includes a first oscillation circuit which forms a first oscillation loop including a first amplifier for generating a first output signal with an oscillating frequency which is controlled according to an operating current of the first amplifier and a second oscillation circuit which forms a second oscillation loop including a second amplifer for generating a second output signal with an oscillating frequency which is controlled according to an operating current of the second amplifer; A circuit for generating a control voltage controls the operating currents of the first and second amplifers and a current regulating circuit for generating an operating current regulating signal regulates the operating currents of the first and second amplifers.

Abstract: An analog signal to be delayed thereby is compressed according to a monotonously increasing, convex compression function and sent to a delay circuit constituted digitally. Data of a digital value stored in a memory is read out after a constant delay time and converted into an analog signal by a D/A converter. The analog signal is expanded according to a reverse function of the compression function to restore it as an echo signal.

Abstract: A stereo signal demodulator circuit demodulates a stereo signal by using a PLL circuit including a voltage-controlled oscillator (VCO) for generating a first oscillation signal and a second oscillation signal having a phase different from that of the first oscillation signal by 90.degree.. The voltage-controlled oscillator circuit includes a first amplifier for outputting a signal whose phase is different from that of an input signal by 90.degree., a second amplifier for outputting a signal whose phase is different from that of an input signal by 90.degree., and a third amplifier for outputting a signal whose phase is different from that of an input signal by 180.degree.. The first, second and third amplifiers are connected in series so that an output signal of the third amplifier is different, in phase, from the input signal of the first amplifier by 360.degree.

Abstract: A voltage control oscillation circuit comprises an oscillation loop and a control current generating circuit. The oscillation loop comprises: a first charge-discharge circuit including a first transistor circuit for converting a reverse voltage signal as a first input voltage into a first charge-discharge current according to a first conversion ratio, and a first capacitor which is charged and discharged by the first charge-discharge current for generating a first charge-discharge voltage signal; a second charge-discharge circuit including a second transistor circuit for converting the first charge-discharge voltage signal as a second input voltage into a second charge-discharge current according to a second conversion ratio, and a second capacitor which is charged and discharged by the second charge-discharge current for generating a second charge-discharge voltage signal; and a reverse circuit for reversing the second charge-discharge voltage signal into the reverse voltage signal.

Abstract: A differential amplifier includes a differential couple in which emitters of a pair of transistors are connected by a resistor. A voltage difference between bases or emitters of the transistors is detected, and a current responding to the voltage difference is fed back to the differential couple from a current canceling circuit to cancel a current which causes the voltage difference. As a result, an offset generated between inputs of a differential amplifier due to differences between constant currents is reduced.

Abstract: The emitter of a first pnp transistor is connected to a power supply voltage via a first resistor. The base and collector of the first transistor are not only connected to each other but connected to a ground terminal via a current source. The emitter of a second pnp transistor is connected to the power supply voltage via a second resistor. The bases of the first and second transistors are connected to each other. An input terminal of this current mirror circuit is connected to the emitter of the first transistor, and an output terminal is connected to the collector of the second transistor.

Abstract: A pulse-width modulator and a driving unit using the same produce from an input signal, two pulse-width modulated signals of different phases with their pulse widths changing in opposite directions, and then produce final modulated signals from the difference between the pulse widths of the two pulse width modulated signals of different phases, thereby increasing the precision.

Abstract: A method for obtaining an optically active .alpha.-phenylglycine benzenesulfonate by optical resolutions which comprises dissolving DL-.alpha.-phenylglycine benzenesulfonate in an aqueous solution of benzenesulfonic acid, cooling the resulting solution to a temperature sufficient to render the solution supersaturated, selectively crystallizing either optically active D- or L-.alpha.-phenylglycine benzenesulfonate in the presence of a seed of either D- or L-.alpha.-phenylglycine benzenesulfonate corresponding to the optically active .alpha.-phenylglycine benzenesulfonate to be crystallized out, and separating the resulting crystals from the liquid phase is disclosed.