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Under demand, it can be also used for high pressure applications up to class 2500.The Babcock’s strong designs and a precision machining of bodies and bonnets shall guarantee the best performances of the valves during operation.The right sealing between body and bonnet is made by designing a more than sufficient type and number of bolts, and selecting the best gasket for each service.There are different joint / gasket designs for each applicable ASME rating. A flat oval gasket is normally used for low pressure (class 150) and a spiral wound gasket for intermediate pressures (class 300) and high pressure (class 600). Other type of joints as corrugated or ring type are also available under demand.

The efficiency of the seal between the gasket and body is determined basically by the gasket angle, which in turn determines the horizontal force component that will act upon them. The smaller the gasket angle, the greater the horizontal component is, and hence, the harper the angle on the bevelled surface, the greater the horizontal component, and the better the seal.

When a pressure seal joint is required to seal over a large range of pressures, there may be difficulties. A gasket which is sufficiently small so as to seal under a pressure of 500 psi. may not support 2.500 psi.

Internal pressure forces the bonnet upwards against the gasket creating forces in the areas of contact between the gasket and the bonnet (disc shaped area). and between the gasket and the body (valve passage area). See (Fig. 1 ). The quality of the seal between the surfaces depends upon two basic considerations, these being the surface quality of the areas in contact, and the degree of force (load per unit area) which holds them together.

Boilerflowcheck valve

A way to overcome this problem is to design the gasket bonnet contact surfaces to have a difference of one degree between them (Fig. 5).

The grooved end check valves are UL/ FM approved. It is suitable for use in building riser pipes and sprinkler systems for fire protection. The grooved ends feature a time saving installation and the built-in spring ensures a smooth and non-slam closure of the dual plate discs.

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A gasket designed with a 25° angle (Fig. 3) will turn into radial force, a greater component of the force exerted by the pressure from the line on the bonnet, than a gasket designed with an angle of 30° 45° (Fig.4). Moreover, in order to achieve large unitary loads, the surface upon which the force is exerted may be reduced, with checks being performed to ensure that the surface is sufficient to support the load without cracking.

Stop-check valves can be supplied with a threaded and welded bonnet. Unlike the bolted bonnet and pressure seal body-bonnet closure systems, the threaded & welded system consists of a double-sealed design, first by threading the bonnet-yoke to the body, and second by sealing it by means of a welding seam.

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The main feature about the pressure seal bonnet is that the body-bonnet joints seals improves as the internal pressure in the valve increases, compa- red to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.The basic operation of this kind of valve, where the seal is achieved from the pressure exerted by the fluid flowing trough the valve, is as follows:

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It is easier to achieve the seal from the two gasket surfaces where a seal is made (gasket-bonnet and gasket-body) in the gasket bonnet contact area, in comparison to the larger component of the force exerted by the pressure inside, and it is more than sufficient to provide a tight seal.

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See our range of Reduced Pressure Zone Devices (RPZDs) for High Hazard applications, Double Check Valves (DCVs) for Medium Hazard applications, purpose built Australian-made In Wall Backflow Tundish cabinets and Detector Check Valves (single detector and double detector) for fire applications.

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A careful design of the gasket pressure seal angle will prevent those more serious difficulties found with large angle gaskets (30°-45°). With a narrow gasket angle (25°), a tight seal can be achieved by applying little pressure, and once the seal has been made, it will stay tight regardless of line conditions. Certain tests performed with narrower gaskets (15°-20°), showed that the seal became so tight that it was impossible to remove the gasket. A gasket of approximately 25° is found to produce a seal that can be easily dismantled.

Leaks most commonly arise at the contact surface between the gasket and the body. The area where the body is in contact with the joint (Fig. 2) is covered with stainless steel, and this improves surface quality and avoids corrosion problems. The force actuating between the contact joint body surfaces is the horizontal component of force perpendicular to the contact surfaces between the bevelled surfaces of the joint and bonnet.

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• Maximum protection in Low Hazard conditions (Single Detector Check Valve) and in Medium Hazard conditions (Double Detector Check Valve) in fire sprinkler systems

The entire valve can be fully serviced inline, fewer parts are needed and ease of valve access and servicing means real savings of time and money.

The threaded & welded design is primarily used on small size forged valves up to 2″, and for high pressure ratings, from ASME class 900 to 4500.

Fluid can circulate although restricted by the intermediate position of the stem. The valve works as a check valve but only to a certain point.

For hot and cold water, configured in S/Steel cabinets with either clear viewing Perspex front panel or optional S/Steel

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MAG-BEECO Backflow Preventers are easy valves to access and service. They deliver the highest level of performance and reliability and will deliver savings on maintenance and commissioning costs.

For hot and cold water, configured in S/Steel cabinets with either clear viewing Perspex front panel or optional S/Steel

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2 Nov 2020 — A water pressure regulator is a kind of plumbing valve that's designed to lessen the water pressure that gets sent through the primary water line.

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