【英文标准名称】:Plastics;markingofplastic
【原文标准名称】:塑料.塑料零件的标志
【标准号】:DIN54840-1992
【标准状态】:作废
【国别】:德国
【发布日期】:1992-12
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:塑料件;设计;作标记;塑料;再循环;特性;识别标志;符号;图形符号;标记;污染控制
【英文主题词】:pollutioncontrol;graphicsymbols;recycling;distinguishingsigns;characteristics;symbols;design;marking;plastics;marks;partsmadeofplastic
【摘要】:
【中国标准分类号】:G31
【国际标准分类号】:6800
【页数】:2P;A4
【正文语种】:德语


Product Code:SAE ARP490
Title:Electrohydraulic Servovalves
Issuing Committee:A-6b1 Hydraulic Servo Actuation Committee
Scope:This SAE Aerospace Recommended Practice (ARP) provides definitions and background information for understanding the physical performance, and test procedures of electrohydraulic flow control servovalves.The recommendations are confined to interface definition and input/output characteristics. This ARP does not restrict or attempt to define the internal characteristics of servovalves. As such, the recommendations are equally applicable to valves having different internal functioning, different ratings, different physical size, and valves used with different fluids. In certain instances, standards for valve design are recommended for the purpose of interchangeability, as for example, valve polarity, mounting bolt and fluid port locations.The ARP provides extensive guidance for the preparation of Procurement Specifications and for functional testing. A sample Procurement Specification is provided in Appendix A. The primary focus of this ARP is on four-way valves. Three-way valves are discussed to a limited extent and terminology for pressure control valves is presented in Appendix B. This ARP is applicable to fluid power systems in all types of flight vehicles, and it is applicable to Military, Civil and Space design/certification standards. Additional specifications or specialized test procedures may be necessary to define special requirements for specific control systems, and such considerations are beyond the scope of this ARP.