ISO 19973-5:2015 空気圧流体力  —  テストによるコンポーネントの信頼性の評価  —  パート5：逆止弁、シャトル弁、二重圧力弁（AND機能）、一方向調整可能な流量制御弁、クイック排気弁 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 131, Fluid power systems.

ISO 19973 consists of the following parts, under the general title Pneumatic fluid power — Assessment of component reliability by testing:

• Part 1: General procedures
• Part 2: Directional control valves
• Part 3: Cylinders with piston rod
• Part 4: Pressure regulators
• Part 5: Non-return valves, shuttle valves, dual pressure valves (AND function), one-way adjustable flow control valves, quick-exhaust valves

Introduction

In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a circuit. Pneumatic fluid power systems are composed of components and are an integral part of various types of machines and equipment. Efficient and economical production requires highly reliable machines and equipment. This part of ISO 19973 is intended to provide requirements and test conditions that permit the assessment of the inherent reliability of pneumatic non-return valves, shuttle valves, dual pressure valves (AND function), one-way flow control valves, quick-exhaust valves.

It is necessary that machine producers know the reliability of the components that make up their machine’s pneumatic fluid power system. Knowing the reliability characteristic of the component, the producers can model the system and make decisions on service intervals, spare parts inventory and areas for future improvements.

There are three primary levels in the determination of component reliability:

Each level has its application during the life of a component. A preliminary design analysis is useful to identify possible failure modes and eliminate them or reduce their effect on reliability. When prototypes are available, in-house laboratory reliability tests are run and initial reliability can be determined. Reliability testing is often continued into the initial production run and throughout the production lifetime as a continuing evaluation of the component. Collection of field data are possible when products are operating and data on their failures are available.

1 Scope

This part of ISO 19973 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, this variable is understood as a number of cycles.

This part of ISO 19973 also specifies test equipment and threshold levels for tests to assess the reliability of these pneumatic valves.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598, ISO 19973-1, IEC 60050-191, and the following apply.

Bibliography