Qu’est-ce que la différence entre A Gate Valve et A Globe Valve?

1. Gate vans with different structures are more complex in structure than globe valves, and are also large in height and size. Gate valves are shorter and higher in appearance than globe valves. Especially, opening the stem gate valve requires a higher height of clearance. If the installation position of the customer's valve is limited, it is necessary to carefully select the rising stem gate valves and recall everyone à payer attention.
2. Quand complètement ouvert, vanne vannes avec different flux résistances pass through the entire flow channel. At this point, the pressure loss during medium operation is very small. The main advantage is that the fluid flow resistance is small. The flow Drag coefficient of ordinary gate valve is about 0.0}8~0.12. Gate valves arely suit for working conditions where fréquent opening and closing are not requis et la porte est conservé entièrement ouvert ou fermé. ils sont pas appropriés pour réguler et étrangler ordinaire arrêter soupapes. Le Drag coefficient est environ 3,5~4.5. Le ouverture et fermeture forces sont très petites. Le flux résistance de la fermeture valve partout s entière course is très élevée, et la requise conduite force ou couple est aussi beaucoup plus. Mais it est très appropriée pour réguler et étrangler fluides.
3. Gate vans with different flow directions of media inside the valve body have the same effect when viewed from both sides. When installing a shut-off valve, the medium can enter from below and above the valve core. The advantage of medium entering from below the valve core is that the packing is not under pressure when the valve is closed, which can extend the service life of the packing. Quand le pipeline dans avant de la vanne est sous pression, le emballage peut être remplacé, qui est généralement seulement approprié pour petit diamètre globe vannes (ci-dessous DN50). Le inconvénient de milieu entrée de dessous le soupape noyau est que le moteur couple de la soupape est relativement grande, environ 1.05-1.08 fois que de la conduite couple entrée de ci-dessus. Le axial force sur la soupape tige est large, and the valve stem is prone to bending. Therefore, globe valves with a diamètre excédant 200 millimètres are all designed with medium flowing in from above.
4. The sealing surface of the gate valve has a certain degree of self sealing ability. The valve core is in close contact with the sealing surface of the valve seat through medium pressure, achieving sealing performance and no leakage. The sealing surfaces of the shut-off valve only come into contact with each other when fully closed, and the relative sliding amount between the forcibly closed valve core and the sealing surface is very small, so the wear of the sealing surface is also very small. When the gate valve is opened and closed, the sealing surfaces of the valve core and valve seat always come into contact and friction with each other, so the sealing surfaces are prone to wear. Especially when the valve is close to the closed state, the pressure difference before and after the valve core is very large, and the wear of the sealing surface is even more severe. The wear of the sealing surface of the shut-off valve is mainly caused by debris in the valve core and sealing face, or by medium high-speed erosion caused by inaccurate closing state.
5. Le maintenance procédures pour different gate vannes sont pas applicables à on-site pipelines, and most globe valves can have leurs sièges et disques remplacés online without the need to remove the entire valve from the pipeline. this is très appropriable for situations where valves and pipelines are welded together. Alors quand choix un produit, comment devrait les fonctions de soupapes et vannes vannes be distingué? Globe vannes ont a plus simple structure, mieux étanchéité, et plus pratique fabrication et maintenance que vanne vannes. Le désavantage est haut fluide résistance et haut ouverture et fermeture forces.
Gate and globe valves are both fully open and fully closed valves, appropriable for shut-off but not suitable for regulating vans. When selecting valves in the application process, attention should be paid to the characteristics of the valves. Globe valves are usually used for small pipelines and better sealing performance. In steam systems and large diameter pipelines, gate valves are suit due to leur low fluid resistance.