Diagnostic system and method for a valve, especially a check valve of a positive displacement pump
AssigneeSiemens Aktiengesellschaft
InventorsWolfgang Ens, Alf Püttmer
Life of this patent
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Abstract
A diagnostic system and method for a valve, especially a check valve of a positive displacement pump, including at least one solid-borne sound sensor is provided. A first value of a parameter of a sound signal recorded in the closed state of the valve and a second value of a parameter of a sound signal recorded in the open state of a valve are determined essentially. A signal indicating a disturbance is issued if the deviation between the first value and the second value exceeds a predefined threshold value, resulting in particularly good insensitivity.
Claims4
A diagnostic system for a check valve of a positive displacement pump having a solid-borne sound sensor, comprising:
- a calculating device configured to calculate a first operative sound level of a first value of a first operative sound signal recorded in a first state of the valve induced during operation of the pump and to determine a second operative sound level of a second value of a second operative sound signal recorded in a second state of the valve induced during operation of the pump, wherein the first sound value is determined based on a current sound signal recorded in the first state of the valve and the second sound value is determined based on a last sound signal recorded in the second state of the valve, the last sound signal being a half period delayed and stored;
- a determining device configured to determine a relevant state of the valve via an auto correlation;
- and
- a signal output that displays a fault if a deviation between the first sound level determined for the first state of the valve and the second sound level determined for the second state of the valve exceeds a pre-determinable threshold value,
- wherein the sensor measures solid borne sound and records the sound signals.
Dependencies are inferred from the claim text.