In petroleum, chemical, metallurgical and energy industries, valve is one of the widely used fluid control equipment. As an important part of the pipeline system, there are many specifications and types of valves with different functions. Some are used to connect or cut off the medium, adjust the medium pressure or flow, prevent the medium pressure from exceeding the specified value, and ensure the safe operation of the pipeline or equipment. Some are also used to separate, mix or distribute media to ensure system process conditions. Due to the role of valves in the pipeline system, the manufacturing process of valves will directly affect the safe operation of pipeline equipment.

隨著工況需求的不斷發(fā)展，對(duì)閥門(mén)性能的要求也越來(lái)越高，產(chǎn)品制造中的有關(guān)工藝也越來(lái)越得到重視。由于閥門(mén)與管道元件相關(guān)的技術(shù)規(guī)范不齊全，如有關(guān)閥門(mén)的焊 接、耐蝕堆焊和耐磨堆焊等沒(méi)有明確的規(guī)定。而閥門(mén)的特殊性，是否可以沿用相關(guān)鍋爐壓力容器壓力管道制造的技術(shù)規(guī)范還有待探討，所有這些都給閥門(mén)的安 全注冊(cè)評(píng)審帶來(lái)一定困難。

With the continuous development of working conditions, the requirements for valve performance are higher and higher, and the relevant processes in product manufacturing are paid more and more attention. Due to the incomplete technical specifications related to valves and pipeline components, there are no clear provisions on valve welding, corrosion-resistant surfacing and wear-resistant surfacing. The particularity of the valve and whether the relevant technical specifications for the manufacture of boiler, pressure vessel and pressure pipeline can be used remain to be discussed, all of which bring some difficulties to the safety registration review of the valve.

大型閥門(mén)的閥體在制造中一般會(huì)采用焊 接形式，而且閥體壁厚往往大于38mm。根據(jù)國(guó)內(nèi)外壓力容器壓力管道的相關(guān)規(guī)定,當(dāng)焊件厚度大于38mm時(shí)，焊后需對(duì)其進(jìn)行熱時(shí)效處理，其目的是去氫，消 除焊 接殘余應(yīng)力和恢復(fù)材料塑性。

The valve body of large valves is generally welded in manufacturing, and the wall thickness of the valve body is often greater than 38mm. According to the relevant regulations of pressure vessels and pressure pipes at home and abroad, when the thickness of weldment is greater than 38mm, it is necessary to carry out thermal aging treatment after welding. The purpose is to remove hydrogen, eliminate welding residual stress and restore material plasticity.

但是，由于密封材料的不同，以及焊后熱時(shí)效可以導(dǎo)致閥體的變形，對(duì)閥門(mén)是否要進(jìn)行熱處理，或者應(yīng)該怎么做才能保證質(zhì)量，在國(guó)內(nèi)的相關(guān)標(biāo)準(zhǔn)中都沒(méi)有規(guī)定。

However, due to the different sealing materials and the deformation of the valve body caused by post welding thermal aging, whether the valve should be heat treated or what should be done to ensure the quality is not specified in the relevant domestic standards.

目前，國(guó)外的大型焊 接閥門(mén)已經(jīng)進(jìn)入我國(guó)的市場(chǎng)，應(yīng)該依據(jù)何種規(guī)范來(lái)驗(yàn)收或閥門(mén)不進(jìn)行焊后熱處理是否符合要求，還值得討論和研究。

At present, foreign large welded valves have entered China's market. It is still worth discussing and studying what specifications should be used for acceptance or whether the valve does not undergo post weld heat treatment meets the requirements.

因此，對(duì)于大型焊 接閥門(mén)這樣一種特定的產(chǎn)品，特別是針對(duì)其是否要進(jìn)行焊后熱時(shí)效，必

Therefore, for a specific product such as large welded valve, especially whether it needs post weld thermal aging, it is necessary

須進(jìn)行全 面的試驗(yàn)，試驗(yàn)包括對(duì)焊 接坡口，接頭形式，溫度應(yīng)力分布或控制及消 除應(yīng)力變形進(jìn)行研究，確定焊 接接頭性能可靠，并制定相應(yīng)的規(guī)范，以確保閥門(mén)的質(zhì)量和可靠性。

A comprehensive test shall be conducted, including the research on the welding groove, joint form, temperature stress distribution or control and elimination of stress and deformation, to determine the reliable performance of the welded joint, and formulate corresponding specifications to ensure the quality and reliability of the valve.