Abstract: In one example, a method includes: receiving a first input value associated with a first data field; responsive to determining that the first data field is associated with an equivalence operation, selecting a second input value associated with a second data field of a previously transmitted message, where the second input field corresponds to the first input field; comparing the first input value and the second input value to determine if the first input value and the second input value are equivalent; and, when the first input value and the second input value are equivalent, generating a message that omits the first input value for the first data field, and providing an operator symbol indicating the equivalence operation to specify that the second input value of the second data field in the previously transmitted message is to be associated with the first data field of the message.

Abstract: The present disclosure relates to a prop (10) comprising a first tube (14) and a second tube (16). The first tube (14) is telescopically connected to the second tube (16) for axially displacing the second tube (16) between a retracted position and an extended position. The first and second tubes (14, 16) each comprise a loading end for receiving an axial load from opposing load surfaces (62, 64) in the extended position. The first tube (14) and the second tube (16) are made from a plastics material.

Abstract: In one example, a method includes: receiving a first input value associated with a first data field; responsive to determining that the first data field is associated with an equivalence operation, selecting a second input value associated with a second data field of a previously transmitted message, wherein the second input field corresponds to the first input field; comparing the first input value and the second input value to determine if the first input value and the second input value are equivalent; and when the first input value and the second input value are equivalent, generating a message that omits the first input value for the first data field, and providing an operator symbol indicating the equivalence operation to specify that the second input value of the second data field in the previously transmitted message is to be associated with the first data field of the message.

Abstract: The present disclosure relates to a prop (10) comprising a first tube (14) and a second tube (16). The first tube (14) is telescopically connected to the second tube (16) for axially displacing the second tube (16) between a retracted position and an extended position. The first and second tubes (14, 16) each comprise a loading end for receiving an axial load from opposing load surfaces (62, 64) in the extended position. The first tube (14) and the second tube (16) are made from a plastics material.

Abstract: In one example, a method includes: receiving a first input value associated with a first data field; responsive to determining that the first data field is associated with an equivalence operation, selecting a second input value associated with a second data field of a previously transmitted message, wherein the second input field corresponds to the first input field; comparing the first input value and the second input value to determine if the first input value and the second input value are equivalent; and when the first input value and the second input value are equivalent, generating a message that omits the first input value for the first data field, and providing an operator symbol indicating the equivalence operation to specify that the second input value of the second data field in the previously transmitted message is to be associated with the first data field of the message.

Abstract: The present invention relates to a support (20) for a prop (22). The prop (22) comprises a telescopic tube (26) and opposing transversely extending feet. The support (20) comprises a board (30) for contacting a support surface to transmit a supporting load thereto; a load bearing surface for receiving the supporting load from a prop (22); a bracket (32) coupled to the board (30), the bracket (32) arranged to support an end of the prop (22) at a load bearing position on the load bearing surface; and a guide for guiding the prop (22) to the load bearing position.

Abstract: The present invention relates to a support (20) for a prop (22). The prop (22) comprises a telescopic tube (26) and opposing transversely extending feet. The support (20) comprises a board (30) for contacting a support surface to transmit a supporting load thereto; a load bearing surface for receiving the supporting load from a prop (22); a bracket (32) coupled to the board (30), the bracket (32) arranged to support an end of the prop (22) at a load bearing position on the load bearing surface; and a guide for guiding the prop (22) to the load bearing position.

Abstract: In one example a method includes: receiving a first input value associated with a first data field; responsive to determining that the first data field is associated with an increment operation, selecting a second input value associated with a corresponding second data field of a previously transmitted message; comparing the first input value and second input value to determine if the first input value includes a sum of the second input value and an increment value; when the first input value includes the sum of the second input value and increment value, generating a message that omits the first input value for the first data field, and providing an operator symbol indicating the increment operation to specify that the first data field of the message is to be associated with the sum of the increment value and second input value of the second data field in the previously transmitted message.

Abstract: In one example, a method includes: receiving a first input value associated with a first data field; responsive to determining the first data field is associated with a delta operation, selecting a second input value associated with a corresponding second data field of a previously transmitted message; comparing the first input and second input values to determine if the first and second input values are equivalent; when the first and second input values are not equivalent, generating a message, wherein the first data field includes only data of the first input value not included in data of the second input value, and providing an operator symbol indicating the delta operation to specify that the first data field of the message includes only data of the first input value that is not included in data of the second input value associated with the second data field of the previously transmitted message.

Abstract: A pump unit which includes a pipe, a flexible bladder inside the pipe, an operating volume between an outer surface of the bladder and an opposing inner surface of the pipe, a valve arrangement to introduce pressurised water into the operating volume and to allow pressurised water to flow from the operating volume and another valve arrangement to allow slurry to flow into the interior of the bladder as water is expelled from the operating volume and to—allow slurry to flow from the bladder when water is introduced into the operating volume.

Abstract: An electrical energy generating system in which high pressure slurry is used to expel water, alternately from two bladders, which is used to power a turbine which drives a generator.

Abstract: In one example, a method includes: receiving a first input value associated with a first data field; responsive to determining the first data field is associated with a delta operation, selecting a second input value associated with a corresponding second data field of a previously transmitted message; comparing the first input and second input values to determine if the first and second input values are equivalent; when the first and second input values are not equivalent, generating a message, wherein the first data field includes only data of the first input value not included in data of the second input value, and providing an operator symbol indicating the delta operation to specify that the first data field of the message includes only data of the first input value that is not included in data of the second input value associated with the second data field of the previously transmitted message.

Abstract: In one example a method includes: selecting, by a computing device, a message description that indicates a pre-defined operator is associated with a message data field; receiving, by the computing device, information associated with the message data field; responsive to determining that the information indicates the message data field does not include data, determining, by the computing device, whether to include, in a second message that is associated with the message description, a data value for the message data field of the second message based on the pre-defined operator that is associated with the message data field, wherein the data value is stored by the computing device and is associated with the message data field.

Abstract: A valve with a housing (12) in which is formed a chamber (14), an inlet (16) to the chamber, an outlet (18) from the chamber which is at a right angle relative to the inlet, a metallic valve seat (90) at the inlet, a resilient valve seal (100) mounted to the valve seat at the inlet and a spherical valve member (40) inside the chamber.

Abstract: In one example, a method includes: receiving a first input value associated with a first data field; responsive to determining the first data field is associated with a delta operation, selecting a second input value associated with a corresponding second data field of a previously transmitted message; comparing the first input and second input values to determine if the first and second input values are equivalent; when the first and second input values are not equivalent, generating a message, wherein the first data field includes only data of the first input value not included in data of the second input value, and providing an operator symbol indicating the delta operation to specify that the first data field of the message includes only data of the first input value that is not included in data of the second input value associated with the second data field of the previously transmitted message.

Abstract: In one example a method includes: receiving a first input value associated with a first data field; responsive to determining that the first data field is associated with an increment operation, selecting a second input value associated with a corresponding second data field of a previously transmitted message; comparing the first input value and second input value to determine if the first input value includes a sum of the second input value and an increment value; when the first input value includes the sum of the second input value and increment value, generating a message that omits the first input value for the first data field, and providing an operator symbol indicating the increment operation to specify that the first data field of the message is to be associated with the sum of the increment value and second input value of the second data field in the previously transmitted message.

Abstract: In one example a method includes: receiving a first input value associated with a first data field; responsive to determining that the first data field is associated with an increment operation, selecting a second input value associated with a corresponding second data field of a previously transmitted message; comparing the first input value and second input value to determine if the first input value includes a sum of the second input value and an increment value; when the first input value includes the sum of the second input value and increment value, generating a message that omits the first input value for the first data field, and providing an operator symbol indicating the increment operation to specify that the first data field of the message is to be associated with the sum of the increment value and second input value of the second data field in the previously transmitted message.

Abstract: In one example, a method includes: receiving a first input value associated with a first data field; responsive to determining the first data field is associated with a delta operation, selecting a second input value associated with a corresponding second data field of a previously transmitted message; comparing the first input and second input values to determine if the first and second input values are equivalent; when the first and second input values are not equivalent, generating a message, wherein the first data field includes only data of the first input value not included in data of the second input value, and providing an operator symbol indicating the delta operation to specify that the first data field of the message includes only data of the first input value that is not included in data of the second input value associated with the second data field of the previously transmitted message.

Abstract: In one example, a method includes: receiving a first input value associated with a first data field; responsive to determining that the first data field is associated with an equivalence operation, selecting a second input value associated with a second data field of a previously transmitted message, wherein the second input field corresponds to the first input field; comparing the first input value and the second input value to determine if the first input value and the second input value are equivalent; and when the first input value and the second input value are equivalent, generating a message that omits the first input value for the first data field, and providing an operator symbol indicating the equivalence operation to specify that the second input value of the second data field in the previously transmitted message is to be associated with the first data field of the message.

Abstract: In one example a method includes: receiving a first input value associated with a first data field; responsive to determining that the first data field is associated with an increment operation, selecting a second input value associated with a corresponding second data field of a previously transmitted message; comparing the first input value and second input value to determine if the first input value includes a sum of the second input value and an increment value; when the first input value includes the sum of the second input value and increment value, generating a message that omits the first input value for the first data field, and providing an operator symbol indicating the increment operation to specify that the first data field of the message is to be associated with the sum of the increment value and second input value of the second data field in the previously transmitted message.