截止閥的啟閉件是閥瓣，閥瓣沿閥座中心線(xiàn)做升降運(yùn)動(dòng)來(lái)實(shí)現(xiàn)閥門(mén)的開(kāi)啟和關(guān)閉。與閘閥不同，截止閥的流道并非直線(xiàn)貫通，介質(zhì)在通過(guò)閥門(mén)時(shí)需要改變流動(dòng)方向，因此流動(dòng)阻力相對(duì)較大。然而，這種結(jié)構(gòu)設(shè)計(jì)也帶來(lái)了閘閥無(wú)法比擬的優(yōu)勢(shì)——密封性能更為可靠，且具備一定的流量調(diào)節(jié)功能。

The opening and closing component of a globe valve is the valve disc, which moves up and down along the centerline of the valve seat to achieve the opening and closing of the valve. Unlike gate valves, globe valves do not have a straight flow path, and the medium needs to change its flow direction when passing through the valve, resulting in relatively high flow resistance. However, this structural design also brings unparalleled advantages over gate valves - more reliable sealing performance and certain flow regulation functions.

良工截止閥在產(chǎn)品設(shè)計(jì)上注重密封的可靠性和使用壽命的延長(zhǎng)。以J41H型法蘭截止閥為例，其密封面硬度高、耐磨、耐高溫、耐腐蝕，抗擦傷性能優(yōu)異，使用壽命長(zhǎng)。閥桿經(jīng)過(guò)調(diào)質(zhì)及表面氮化處理，具有良好的抗腐蝕性、抗擦傷性和耐磨性。這些材料和工藝上的精良處理，確保了截止閥在頻繁啟閉的工況下依然能夠保持可靠的密封性能。

Lianggong globe valves pay attention to the reliability of sealing and the extension of service life in product design. Taking the J41H flange globe valve as an example, its sealing surface has high hardness, wear resistance, high temperature resistance, corrosion resistance, excellent scratch resistance, and long service life. The valve stem has undergone quenching and surface nitriding treatment, exhibiting excellent corrosion resistance, abrasion resistance, and wear resistance. The excellent treatment of these materials and processes ensures that the shut-off valve can maintain reliable sealing performance even under frequent opening and closing conditions.

核級(jí)截止閥代表了良工閥門(mén)技術(shù)的非常高水準(zhǔn)。良工閥門(mén)是國(guó)內(nèi)第一批獲得民用核承壓設(shè)備設(shè)計(jì)制造許可證的企業(yè)，其核一級(jí)截止閥的技術(shù)參數(shù)令人矚目。

The nuclear grade globe valve represents the highest level of Lianggong valve technology. Lianggong Valve is one of the first domestic enterprises to obtain a design and manufacturing license for civil nuclear pressure equipment, and its technical parameters for nuclear first level globe valves are remarkable.

以良工核一級(jí)氣動(dòng)截止閥為例：公稱(chēng)通徑DN15，壓力等級(jí)1650Lb，設(shè)計(jì)壓力高達(dá)17.13MPa，設(shè)計(jì)溫度343℃。工作介質(zhì)為反應(yīng)堆冷卻劑、設(shè)備冷卻水、含硼水。端部連接采用承插焊方式，抗震類(lèi)別為IA，電氣鑒定等級(jí)為K1，啟閉時(shí)間僅需10至15秒。

Taking the first stage pneumatic globe valve of Lianggong Nuclear as an example: nominal diameter DN15, pressure rating 1650Lb, design pressure up to 17.13MPa, design temperature 343 ℃. The working medium includes reactor coolant, equipment cooling water, and boron containing water. The end connection adopts socket welding method, with seismic category of IA and electrical identification level of K1. The opening and closing time only takes 10 to 15 seconds.

在設(shè)計(jì)上，這款核一級(jí)截止閥攻克了多項(xiàng)技術(shù)難題。通過(guò)解決深孔堆焊的技術(shù)難題，閥體采用了輕巧的整體自由鍛造結(jié)構(gòu)，有效降低了閥門(mén)重量和安裝高度，提升了抗震性能。閥體與閥蓋的連接采用螺紋連接形式，由閥蓋底平面壓緊墊片、上平面與閥體完全嚙合，外圈帶唇邊焊的多重密封結(jié)構(gòu)——這種設(shè)計(jì)解決了傳統(tǒng)墊片密封中閥體閥蓋不能完全嚙合、留有縫隙、一旦焊縫失效就容易泄漏的缺陷。從設(shè)計(jì)和結(jié)構(gòu)上消除了密封泄漏的隱患，確保了核電站一回路系統(tǒng)的絕對(duì)安全。

In terms of design, this nuclear first stage globe valve has overcome multiple technical challenges. By solving the technical difficulties of deep hole welding, the valve body adopts a lightweight integral free forging structure, effectively reducing the weight and installation height of the valve and improving its seismic performance. The connection between the valve body and the valve cover adopts a threaded connection form, with the gasket pressed by the bottom plane of the valve cover, the upper plane fully engaged with the valve body, and a multiple sealing structure with lip welding on the outer ring. This design solves the defects of traditional gasket sealing, such as incomplete engagement of the valve body and valve cover, gaps, and easy leakage once the weld fails. The hidden danger of sealing leakage has been eliminated from the design and structure, ensuring the absolute safety of the primary circuit system of the nuclear power plant.