Abstract: A valve assembly (10) configured to maintain fluid flow therethrough at a constant flow rate. The valve assembly (10) including a flexible flow control member (50) defining an inner fluid chamber (90) within the flexible flow control member (50) and an inlet opening (56) to the inner fluid chamber (90). An outer fluid chamber (92) is defined between the flexible flow control member (50) and an inner surface (74) of a valve housing (20). The flexible flow control member (50) is configured to flex inward and shrink the inner fluid chamber (90) in response to a pressure decrease in the inner fluid chamber (90) relative to the outer fluid chamber (92) resulting from an increase in an inlet flow rate to maintain an outlet flow rate from the valve assembly (10) at the constant flow rate.

Abstract: Disclosed is a system including a flow regulating system. The flow regulating system may assist in ensuring a selected pressure within an inlet volume. The flow regulator may be included in a shunt assembly.

Abstract: A system includes a flow regulating system. The flow regulating system may assist in ensuring a selected pressure within an inlet volume. A flow regulator may be included in a shunt assembly(10).

Abstract: A system includes a flow regulating system. The flow regulating system may assist in ensuring a selected pressure within an inlet volume. A flow regulator may be included in a shunt assembly (10).

Abstract: Disclosed is a system including a flow regulating system. The flow regulating system may assist in ensuring a selected pressure within an inlet volume. The flow regulator may be included in a shunt assembly.

Abstract: A star-shaped polyacrylamide copolymer and a preparation method thereof are provided, as well as a drilling fluid containing the star-shaped polyacrylamide copolymer. Only the star-shaped polyacrylamide copolymer is added into the drilling fluid; under a high-temperature environment, the filtration volume of the drilling fluid can be reduced, the high-temperature rheological property of the drilling fluid is improved, and the pressure loss of a circulation system of the drilling fluid is reduced.

Abstract: A star-shaped polyacrylamide copolymer and a preparation method thereof are provided, as well as a drilling fluid containing the star-shaped polyacrylamide copolymer. Only the star-shaped polyacrylamide copolymer is added into the drilling fluid; under a high-temperature environment, the filtration volume of the drilling fluid can be reduced, the high-temperature rheological property of the drilling fluid is improved, and the pressure loss of a circulation system of the drilling fluid is reduced.

Abstract: A tapping control method and a terminal, which relate to the communications field and can avoid frequent automatic setting of the terminal caused by an unconscious operation of a user, thereby implementing accurate operation control on the terminal and improving a capability of the terminal to interact with the user. A specific solution is as follows. The terminal detects a tapping trigger signal within a preset frequency range by using a shock sensor; after the tapping trigger signal is detected, identifies a tapping action type corresponding to the tapping trigger signal; acquires a tapping response event that matches the identified tapping action type; and executes the tapping response event. The present disclosure can be used in a process of operation control on the terminal.