作者：管理員 發布于：2019-01-14 17:43:26 文字：【大
不銹鋼截止閥的“低進高出”和“高進低出” Stainless steel globe valves for "low in high" and "high in low out" 高”和“低”是指截止閥結構外形，沿著閥桿向下看與閥桿同軸向下凸起的部分為“低”，旁邊與閥腔相連稍靠上（相對于“低”而言）的通道為上。 "High" and "low" refer to the globe valve configuration, along the stem looking down with the stem coaxial downward convex part is "low", next to the valve cavity connected slightly up (relative to "low") channel is up.不銹鋼截止閥一般的介質流向是低進高出，這是根據截止閥內腔的結構要求的。 Stainless steel globe valve general medium flow is low into high, this is according to the structure of the globe valve cavity requirements.是指流體進入閥門時，在閥腔內，由低向上流動，然后流出閥體。 Refers to the fluid into the valve, in the valve cavity, by the low upward flow, and then flow out of the valve body.閥瓣在閥腔的頂部。 The disc is at the top of the chamber. 介質從閥芯的下方進入的缺點是閥門的驅動轉矩較大，約為上方進入的1.05~1.08倍，閥桿受的軸向力大，閥桿容易彎曲。 The disadvantage of the media from the bottom of the spool into the valve drive torque is large, about 1.05~1.08 times into the top, the stem by the axial force, the stem is easy to bend.為此，介質從下方進入方式，一般只適用于小口徑截止閥(DN50以下)，DN200以上的截止閥都選用介質從上方流入的方式。 For this reason, the medium from the bottom into the way, generally only applicable to small diameter globe valve (DN50 below), DN200 above the globe valve selection medium from the top into the way.電動截止閥一般是采用介質從上方進入的方式。 Electric globe valves generally use medium from the top into the way.介質從上方進入方式的缺點正好與下方進入方式相反。 The disadvantage of media entry from above is just the opposite of that from below. 一般設計要求,DN≤200mm PN≤4.0MPa的截止閥,采用低進高出.當DN>200mm以上時,選用高進低出.截止閥閥瓣為雙閥瓣結構.因為當口徑大于200mm時,由于流量變大,單位面積上的壓力很大,采用低進高出時需要很大的相反作用力才能保證密封.這樣必須閥桿加大,而且必須采用撞擊手輪或者采用大扭矩蝸輪裝置.增加的了閥門的體積和產品成本，而且效果不佳。 General design requirements, the DN 200 mm or less PN 4.0 MPa or less cut-off valve, with low into higher. When the DN > 200 mm above, choose high in low out. Stop valve disc for double disc structure. Because when diameter greater than 200 mm, because of the traffic, a lot of pressure on unit area, with low into the higher need a great deal of the opposite force to guarantee seal. This must be the valve stem, and must adopt impact handwheel or worm gear device. High increase in the volume of the valve and the product cost, and the effect not beautiful.高進低出有助于密封（關閉后介質自壓加強了密封效果），但開啟時由于要克服介質壓力，比較困難。 High in and low out is helpful for sealing (after closing, the media self-pressure enhances the sealing effect), but it is difficult to overcome the medium pressure when opening.“有利于密封，介質壓力使閥密封更嚴密，閥桿受力狀況改善。 "Is advantageous to the seal, the medium pressure causes the valve to seal more closely, the valve stem stress condition improvement. 總之，閥門上標有流向的，按流向裝就可以。 In short, the valve marked with the flow direction, according to the flow installed on it.