ISO/TC 131/WG 4 - Determination of the reliability of pneumatic components by testing

ISO 19973-3:2015 provides test procedures for assessing the reliability of pneumatic cylinders with piston rod, both single-acting and double-acting, by testing and the methods of reporting the results of testing. General test conditions and the calculation method are provided in ISO 19973‑1. The methods specified in ISO 19973‑1 apply to the first failure, as obtained with the three-point moving average (3PMA) method, without repairs, but excluding outliers. The lifetime of pneumatic cylinders is usually given in number of cycles or in kilometres. Therefore, whenever the term "time" is used in this part of ISO 19973-3:2015, this variable is to be understood as cycles or kilometres. ISO 19973-3:2015 also specifies test equipment and threshold levels for tests to assess the reliability of pneumatic cylinders with piston rods. ISO 19973-3:2015 is intended to be applied to pneumatic piston rod cylinders that conform to ISO 6430, ISO 6432, ISO 15552, and ISO 21287; however, pneumatic piston rod cylinders that do not conform to these International Standards but are used in the same range of operating conditions can be tested in accordance with one of the classes defined in Tables 1 and 2.

ISO 19973-5:2015 provides test procedures for assessing the reliability of the following types of pneumatic valves: ? non-return (check) valves; ? pilot-operated non-return valves; ? shuttle valves; ? dual pressure valves (AND function); ? one-way adjustable flow control valves; ? quick-exhaust valves by testing and the methods of reporting the results of testing. General test conditions and the calculation method are provided in ISO 19973‑1. The methods specified in ISO 19973‑1 apply to the first failure, as obtained with the three-points moving average (3PMA) method, without repairs, but excluding outliers. The lifetime of these pneumatic valves is usually given as a number of cycles. Therefore, whenever the term "time" is used in this part of ISO 19973-5:2015, this variable is understood as a number of cycles. ISO 19973-5:2015 also specifies test equipment and threshold levels for tests to assess the reliability of these pneumatic valves.

ISO 19973-2:2015 provides test procedures for assessing the reliability of pneumatic directional control valves by testing and the methods of reporting the results of testing. General test conditions and the calculation method are provided in ISO 19973-1. The methods specified in ISO 19973-1 apply to the first failure, as obtained with the three-points moving average (3PMA) method, without repairs, but excluding outliers. The lifetime of pneumatic and electro-pneumatic directional control valves is usually given as a number of cycles. Therefore, whenever the term "time" is used in this part of ISO 19973-2:2015, this variable is to be understood as cycles. ISO 19973-2:2015 also specifies test equipment and threshold levels for tests to assess the reliability of pneumatic directional control valves.

ISO 19973-1:2015 provides general procedures, the calculation method for assessing the reliability of pneumatic fluid power components and the methods of reporting. These procedures are independent of the kinds of components and of their design. ISO 19973-1:2015 also provides general test conditions and a method for data evaluation. NOTE Because the service life of any component is subject to variations, a statistical evaluation assists the interpretation of the test results. The methods specified in this part of ISO 19973 apply to the first failure without repairs (see IEC 60300‑3‑5), but exclude outliers; however, because outliers can be highly significant, information about how to deal with them is given in Annex F.

ISO 19973-4:2014 provides test procedures for assessing the reliability of pneumatic pressure regulators by testing and the methods of reporting the results of testing. General test conditions and the calculation method are provided in ISO 19973-1. The methods specified in ISO 19973-1 apply to the first failure, as obtained with the three-points moving average (3PMA) method, without repairs, but excluding outliers. ISO 19973-4:2014 applies to manually adjustable and remote-piloted pressure regulators, both relieving and non-relieving. It does not apply to pressure regulators that have a permanent bleed. ISO 19973-4:2014 also specifies test equipment and failure criteria (threshold levels) for tests to assess the reliability of pneumatic pressure regulators.

ISO 19973-4:2007 provides test procedures for assessing the reliability of pneumatic pressure regulators by testing and the methods of reporting the results of testing. General test conditions and the calculation method are provided in ISO 19973-1. The methods specified in ISO 19973-1 apply to the first failure without repairs, but exclude outliers. ISO 19973-4:2007 applies to manually adjustable and remote-piloted pressure regulators, both relieving and non-relieving. ISO 19973-4:2007 does not apply to pressure regulators that have a permanent bleed. ISO 19973-4:2007 also specifies test equipment and failure criteria (threshold levels) for tests to assess the reliability of pneumatic pressure regulators.

ISO 19973-1:2007 provides general procedures, the calculation method for assessing the reliability of pneumatic fluid power components and the methods of reporting. These procedures are independent of the kinds of components and of their design. ISO 19973-1:2007 also provides general test conditions and a method for data evaluation. Because the service life of any component is subject to accidental variations, a statistical evaluation assists the interpretation of the test results. The methods specified in ISO 19973-1:2007 apply to the first failure without repairs, but exclude outliers; however, because outliers can be highly significant, information about how to deal with them is given.

ISO19973-3:2007 provides test procedures for determining reliability of pneumatic cylinders with piston rod by testing and the methods of reporting the results of testing. The general test conditions and the calculation method provided in Part 1 of ISO 19973 apply to the first failure without repairs, but exclude outliers. The lifetime of pneumatic cylinders is usually given in number of cycles or in kilometres. Therefore, whenever the term "time" is used in this part of ISO19973-3:2007, this variable is to be understood as cycles or kilometres. ISO19973-3:2007 also specifies test equipment and threshold levels for tests to determine the reliability of pneumatic cylinders with piston rods, both single-acting and double-acting. ISO19973-3:2007 is intended to be applied to pneumatic piston rod cylinders that conform to ISO 6430, ISO 6432, ISO 15552 and ISO 21287; however, pneumatic piston rod cylinders that do not conform to these International Standards but are used in the same range of operating conditions can be tested in accordance with one of the classes defined inISO19973-3:2007. It is necessary that any deviation from ISO19973-3:2007 be documented in the test report.

ISO 19973-2:2007 provides test procedures for determining the reliability of pneumatic directional control valves by testing and the methods of reporting the results of testing according to the general test conditions and the calculation method provided in ISO 19973-1. The lifetime of pneumatic and electro-pneumatic directional control valves is usually given as a number of cycles. Therefore, whenever the term "time" is used in ISO 19973-2:2007, this variable is understood as cycles. ISO 19973-2:2007 also specifies test equipment and threshold levels for tests to determine the reliability of pneumatic directional control valves.