The disclosure relates to a method and an arrangement for diagnosis of a final control element, which is actuated by a pneumatically operated actuating mechanism under the control of a control device, and which emits acoustic signals during conventional use. It is proposed to detect acoustic signals fed back into the pneumatic system of the actuating mechanism, and to derive from them the status data of the final control element. For this purpose, an acoustic sensor is arranged in the pneumatic-fluid supply line of the actuating mechanism, with the acoustic sensor being electrically connected to an analysis device. A pressure sensor is used as the acoustic sensor.

Method and arrangement for diagnosis of a final control element

A leak detector for detecting a leak in a line includes a transmitting device for generating radiation to be coupled into the line. By a receiving device, radiation that has emerged from the line through a leak is received, as a result of which the leak becomes detectable.

Valve for a leak detector

Leak detector and detection method using radiation transmitted through a fluid line

A rail tank car evacuation and transfer system and method. A method includes steps of providing an evacuation and transfer line having an inlet end and an outlet end, causing liquid contained inside the rail tank car to flow into the inlet end to at least a first location between the inlet and outlet ends of the evacuation and transfer line by pressurizing the interior of the rail tank car with a gas, sensing, at the first location, a change in the contents of the line from (a) consisting essentially of liquid to (b) including gas, and shutting off the flow through the line in response to the change.

Rail tank car evacuation and transfer system and method

The invention discloses a method and a device for detecting the setting rationality of an exhaust valve, and belongs to the technical field of transmission and distribution. The method comprises: forany exhaust valve on a target pipeline, obtaining the setting position of the exhaust valve, and liquid and gas being contained in the target pipeline; acquiring first motion information of the liquidat a set position; acquiring second motion information of the gas at the set position based on the first motion information; and determining whether the setting position of the exhaust valve is reasonable based on the second motion information. According to the method, the second motion information of the gas in the target pipeline at the setting position is obtained through the first motion information of the liquid in the target pipeline at the setting position of the exhaust valve, and then whether the setting position of the exhaust valve is reasonable or not can be detected according tothe second motion information. Therefore, the technical scheme provided by the invention is low in detection cost, high in detection efficiency and relatively high in universality, thereby being relatively flexible.

Method and device for detecting setting rationality of exhaust valve

An acoustic flow meter in the form of a valve key has an acoustic sensor for measuring the peak sound level which occurs when the key is used to close a valve in a fluid pipeline. The peak sound level can be used to accurately calculate the flow through the valve and provide the flow information on a display unit. Parameters for the upstream supply pressure, pipe diameter and valve characteristics can be entered to ensure the accuracy of the flow calculations. The key therefore provides a way of determining fluid flow in a pipeline to a reasonable level of accuracy without having to install in-line flow meters.

Arthur Arscott

Papers

Acoustic flow meter in the form of a valve key