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Made by Mogas, USA Catalogue# 010253000 Back |
Ball
Standard
Optional
Features
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SeatsStandard
Optional
Features
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Seat Technology |
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Mogas uses two different methods of trapping the downstream seat in place. Both methods of locking-in the seat provide sealed seat protection and easy seat removal for repair. By trapping the seat into its proper place, debris cannot get behind the seat and cause leakage. |
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Coatings In critical services, the reliability of a valve is often dependent upon proper coating selection. In metal to metal sealing ball valves the ball and seat coating must provide wear and anti-gall properties. Coatings must be compatible with base materials for proper adhesion, corrosion resistance and thermal stability. Mogas has more than 25 years of research and in-service experience that has led to our expertise in coating selection. Once the coating is selected, it is imperative that the coating vendor apply the coating correctly. Mogas approves coating vendors only after extensive metallurgical testing of their coating systems. Selected vendors apply coatings to exact specifications. In addition, random sampling and a vendor audit system ensure that only the highest quality coatings are applied to Mogas valves. |
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Stem Seal Bearings Mogas utilizes coated, lapped metal ring/rings between the stem shoulder and the blow out proof pocket in the body. This creates a pressure energized stem seal internal to the valve. The lapped surfaces secure a tight seal that is enhanced by line pressure exerting additional vertical force. This seal saves the stuffing box from thermal shocks and particle migration.The ring/rings also serve as a thrust bearing which eliminate radial movement that can cause packing wear.
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Packing Chamber Mogas utilizes an industry preferred system of two or three sandwiched rings of die-formed Grafoil ribbon between upper and lower braided carbon fiber anti-extrusion rings. This is an optimum system which has enough Grafoil to effect a seal without having redundant rings for show. A heavy stainless steel gland follower, secured by a minimum of four studs, compresses the system. This insures proper load strength and minimizes the possibility of cocking. |
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Actuator Mounting Flanges Mogas utilizes a rigidly secured mounting bracket for actuators, wormgears and levers. The bracket, constructed of heavy plate steel, is welded or bolted to the valve body. The mounting plate is parallel to the bore, and perpendicular to the stem, so there is no misalignment of the operator. Mogas places a heavy metal bushing in the bracket of the valve to guide the stem and ensure that the stem does not side load during operation. If side loading occurs, it is absorbed outside the packing chamber and does not deform packing. Deformation of packing caused by side loading is a major cause of stem leakage in rotary valves. All of these components work together to provide the most reliable stem seal in the industry. |
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Stem Packing
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Bolting The coefficients of thermal expansion of body and bolting materials are important criteria in the selection and design of the bolting on the valve. The bolt sizing criteria is based on generating sufficient load to the seat to retain pressure on the gasket. On both high and low pressure valves, a body bolting make-up torque is specified which provides a preload between the body and end connection. This bolting torque is sufficient to insure there will be no relative movement during pressure or thermal cycling of the valve in service. |
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Gaskets · Spiral wound for 150# to 1500# ANSI Class, Inconel with Grafoil for all temperatures · Pressure energized gold plated delta ring gasket for 2500# to 4500# ANSI Class · Inconel 718 for Carbon Steel, F-22 & Nickel Alloy body materials · A638 Gr. 660 for Stainless Steel body material
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End Connections Mogas manufactures many valves with almost any style of end connection. All end configurations are machined integral with the body and end connections of the valve, instead of multiple piece construction. The choice of end connection configurations is usually left to the discretion of the customer. |
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