Improper selection, installation, use and maintenance service elements such as bad provoked. The so-called natural damage, refers to the valve under normal working conditions and wear, medium of exhaust valve sealing surface shall not prevent the formation damage such as corrosion and erosion. As these do not resolutely prevent the loss of billet are called natural damage. The cause of formation damage, boil down following several: 1. Exhaust valve sealing surface machining quality is bad: the main appearance in the exhaust Industrial Valves sealing surface cracks, porosity and defects such as holes, were due to improper overlaying welding and heat treatment standards selection, operation in the process of the overlaying welding and heat treatment and adverse provoked, the Industrial Valves sealing surface through the high or low, because the material is wrong or improper heat treatment provoked, exhaust valve sealing surface uneven hardness, corrosion resistance, is largely due to the underlying metal in welding process blow to the above, dilute the leading of the valve sealing surface alloy components. There also have a design problem. 2. Improper selection and operation bad provoked by the damage: main appearance without according to choose the valve working condition, apply the block valves when the throttle valve, close the pressure is too large and close too fast or closed lax, the exhaust valve sealing surface erosion and abrasion. 3. Device is not lack of maintenance by exhaust valve sealing surface work is not normal, the valve to operate, in spite of premature damage exhaust valve sealing surface. 4. Chemical corrosion medium, the medium around the vent valve sealing surface, in does not produce current situation, the medium directly with the exhaust valve sealing surface chemistry, corrosion package is exhaust valve sealing surface. 5. Electrochemical corrosion study: exhaust Industrial Valves sealing surface contact each other, exhaust valve sealing surface contact with shut down and the body, and the concentration of the medium is poor, poor oxygen concentration, will generate an electrical potential difference, electrochemical corrosion of anode on the one hand, the valve sealing surface corrosion.
Nowadays, the adoption of ductile iron gate valve in os&y gate valve industry is quite common.
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resilient seated valve resilient seated gate valve is slower than y gate valve but has a number of special applications, such as for resilient valve.
Basically, you cannot have a cast iron gate valve without having the right wedge gate valve. Since you are going to use it regularly, be sure to invest in one that has a high quality.