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原文
Bellows valve structural features and industry standards Bellows valves through a series of strict inspection and testing procedures. Including 100% for air sealing and no leakage testing test. Required to have the vacuum bellows, by helium leak detectors for real air tightness testing. The structural characteristics of the valve bellows: 1 with the valve body and bonnet connection stud, simple structure, process performance. (2) The valve stem is not only a general valve stuffing box, packing box and in the lower part of the valve chamber in the upper part fitted with sealing elements - stainless steel bellows, the media is enclosed in the stem of the valve chamber outside , can not enter the stuffing box, so the valve in the valve to prevent leakage of the more general aspects of a more reliable connection to ensure that the stem and the valve cover seal. 3 stem nut surface-nitriding, surface hardness and wear resistance, to prevent the occlusion phenomenon. 4 flange bolts used in the manufacture of high-strength alloy steel, high temperature creep performance, safety and reliability. 5 bellows design within the cavity in the valve cover to prevent erosion and the media directly improve the life of bellows. 6 bellows with 2 to 4 times overlapping, single-layer corrugated pipes to prevent breakage leaving the valve leaks, extend the life of the valve. 7 because of the relatively long bellows design, large opening height, the main drag reducing fluid flow resistance coefficient. 8 double bellows with packing and sealing, zero leakage. Bellows valve design and manufacture and acceptance criteria for design and manufacture according to GB/T12224, DIN3202, DIN3239, ASMEB16.34, API602, MSS-SP-117. Tested according to API598, JB/T9092, DIN3230. Labeled according to MSS-SP-25.
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译文：
波纹管阀门经过一系列严格的检验与测试程序。其中包括100%地进行气密封性和无渗漏性测试检验。对有真空度要求的波纹管，可通过氦质谱检漏仪进行真空气密封性检测。波纹管阀门的结构特点： 1.阀体与阀盖用双头螺柱连接，结构简单，工艺性能好。 2.本阀门的阀杆不仅有一般阀门的填料函，而且在这个填料函的下部，在阀腔上部装有活动密封元件-不锈钢波纹管，介质被封闭在阀杆以外的阀腔内，不能进入填料函，因此本阀门较一般阀门在防止外漏方面更为可靠，保证阀杆与阀盖连接的密封。 3.阀杆螺母采用表面氮化，提高表面硬度及耐磨性，防止咬合现象。 4.中法兰螺栓采用高强度合金钢制造，抗高温蠕变性能优良，安全可靠。 5.波纹管设计在阀盖内腔内，避免与介质直接冲刷，提高波纹管的使用寿命。 6.波纹管采用2~4倍重叠，防止因波纹管单层破损而使阀门泄露，延长阀门的使用寿命。 7.因波纹管设计的比较长，开启高度大，减少流体主阻力，流阻系数小。 8.采用填料和波纹管双重密封，达到零泄露。波纹管阀门的设计制造及验收标准设计制造按GB/T12224、DIN3202、DIN3239、ASMEB16.34、API602、MSS-SP-117。检验与测试按API598、JB/T9092、DIN3230。标记按MSS-SP-25。

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