Illustrative embodiments of a meter box and couplings, either separately or in combination, are provided. An illustrative embodiment provides a valve coupling that is disposed through a wall of the meter box such that a first portion of the valve coupling extends exterior of the meter box and a second portion of the valve coupling extends interior of the meter box. An outlet coupling is disposed through the wall of the meter box such that a first portion of the outlet coupling extends exterior of the meter box and a second portion of the outlet coupling extends interior of the meter box. A telescoping tube is located in the meter box, extended into and movable relative to, and in fluid communication with, at least one of the second portion of the valve coupling and/or the second portion of the outlet coupling. The telescoping tube varies a distance between the valve coupling and the outlet coupling within the meter box.

A meter bypass assembly includes a housing and a valve assembly. The housing defines a first inlet and a first outlet, and a second inlet and a second outlet. The valve assembly is rotatable to a first position in which fluid is allowed to flow from the first inlet to the first outlet and from the second inlet to the second outlet. The valve assembly is also rotatable to a second position in which fluid is allowed to flow from the first inlet to the second outlet and is restricted from flowing from the first inlet to the first outlet and from the second inlet to the second outlet. The valve assembly includes a shaft extending in a longitudinal direction of the housing and first and second valve bodies rotationally fixed to opposing ends of the shaft.

Flow sensors are provided that can monitor flow conditions. The flow sensor includes a gauge that provides a first level of information about flow through the sensor, and an indicator associated with the gauge that can provided a second level of information about flow through the sensor. The indicator might be in the form of a dial that can rotate about the gauge and might include a locked position for monitoring flow and an unlocked position to rotate the dial about the gauge to reposition the dial. A twisted shaft with varying twist rate is provided to convert linear motion to rotational motion for the gauge.

Embodiments of the present invention provide a hinge nut apparatus for a meter coupling. In an embodiment of the invention, the hinge nut includes at least two portions attached to each other by a hinge pin adjacent a distal end of each portion and the two portions are configured to be moved between an open position and a closed position. The closed position forms an outer surface and an opening forming an inner surface. The inner surface includes a first interior diameter adjacent a distal end of the opening and a second interior diameter adjacent the first interior diameter. The second interior diameter is greater than the first interior diameter and forms a lip and at least a portion of the second interior diameter includes threading.

A measuring device for determining the flow of a fluid flowing through a pipe section. The measuring device may comprise a measuring pipe arrangement with a pipe, at least one ultrasonic sensor for transmitting an acoustic signal, at least one ultrasonic receiver for receiving the acoustic signal emitted by the ultrasonic sensor, a reflection element for reflecting the acoustic signal, wherein the wall of the pipe has a through-opening, which is covered by the reflection element, wherein the reflection element is fastened in interlocking fashion to the wall of the pipe.

A bypass valve includes a base defining a base sealing surface, the base defining an upstream utility bore, a downstream utility bore, a meter inlet bore, and a meter outlet bore each extending into the base sealing surface; and a selector defining a selector sealing surface and a front surface, a primary passage and a secondary passage defined within the selector between the selector sealing surface and the front surface, the primary passage being isolated from the secondary passage, the selector defining at least one primary passage bore extending into the selector sealing surface and connected in fluid communication with the primary passage, the selector defining at least one secondary passage bore extending into the selector sealing surface and connected in fluid communication with the secondary passage.

A flow meter coupling system (300) to reduce axial stress on a flow meter (302) comprising a first flow meter flange (314a) and a second flow meter flange (314b) is provided. The flow meter coupling system (300) comprises a first process fluid member (304) configured to be coupled to the first flow meter flange (314a) of the flow meter (302), a second process fluid member (306), and a second connector member (310) configured to be rigidly coupled to at least one of the second flow meter flange (314b) or the second process fluid member (306) and coupled to another of the second flow meter flange (314b) or the second process fluid member (306) in a manner that provides substantially no axial stress.

A bypass valve includes a base defining a base sealing surface, the base defining a upstream utility bore, a downstream utility bore, a meter inlet bore, and a meter outlet bore each extending into the base sealing surface; and a selector defining a selector sealing surface positioned in sealing engagement with the base sealing surface, the selector defining a primary passage and a secondary passage, the selector defining at least one primary passage bore extending into the selector sealing surface and connecting in fluid communication with the primary passage, the selector defining at least one secondary passage bore extending into the selector sealing surface and connecting in fluid communication with the secondary passage, the selector being rotatable relative to the base about and between a meter position and a bypass position, the selector connecting the upstream utility bore in fluid communication with the meter inlet bore in the meter position.

A pressure gauge of a fluid pressure system includes a measurement unit, a case, a display unit, and an adapter. The adapter includes an attachment hole. The case includes an attachment convex portion which can be fitted into the attachment hole. The display unit includes a display surface oriented in a direction intersecting an axis of the attachment convex portion. The attachment convex portion and the attachment hole have a fitting structure capable of changing the relative position between the attachment convex portion and the adapter in the circumferential direction about the axis of the attachment convex portion.

Disclosed is an ultrasonic flow meter configured to measure the flow rate of a fluid using ultrasonic waves, wherein branch flow paths are formed in a flow path in order to regularly reduce the sectional area of the flow path over at least a predetermined distance between reflectors such that the flow speed of the fluid in the flow path between the reflectors is increased without pressure loss, whereby it is possible to improve measurement accuracy.