| BLOW
DOWN VALVES |
Continuous and intermittent blowdown control are decisive factors in boiler efficiency and maintenance. Valves designed for these duties are required to be robust, compact and easy to operate. Their function ensures that total dissolved solids (TDS) boiler systems are kept within the limits that optimize performance and reduce the instances of failure and maintenance.
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| CHECK
VALVES |
The duty of a check valve in fluid circuits is to allow flow in one direction and prevent flow in the reverse direction. This function is achieved using one of four basic valve designs that each has characteristics aligned to ensuring flow, pressure and fluid dynamics are note adversely affected by the installation. Lift check and ball check valves utilize line pressure to lift a poppet or ball allowing flow in one direction. In no flow conditions the poppet of ball seats on a mating surface utilizing gravity, a spring or reversing line pressure. Swing and tilting disk check valves utilize flow to swing the valve away from its mating seat and, under no flow conditions, the valve seats on a mating surface utilizing gravity or a spring. |
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| CRYOGENIC
VALVES |
Cryogenic valves are designed to operate in applications where the temperature is normally below -150oC. Below this temperature materials must be selected that maintain their ductility, material strength and physical properties over a wide temperature range. The design of valve components must also must also cater for the mechanical stresses, induced through thermal cycling, and continue provide tight shut off and trouble free operation. Normally valve designs for cryogenic services are of the ball, globe, gate and butterfly type and feature an extended bonnet housing that allows the valves packing components to be installed away from the cold valve body thus eliminating the effects of freezing and allowing the valve to operate normally. |
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| HF
ACID VALVES |
In a standard oil refinery, the alkylation process is used to enhance the yield of high octane gasoline from crude oil. The process utilizes catalytic acids, such as sulfuric and hydrofluoric acid, combined with other process, such as cracking and polymerization, to produce the final gasoline product. The design of valves, for this demanding service require, not only the selection of suitable materials, but a physical design that ensures plant and operators are not exposed to the catalytic product through leaking glands, joints and pipe work. These applications often require the valve components to be painted with a reactive paint that indicates the presence of the catalyst by a change in color. |
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| JACKETED
VALVES |
Processes that control the flow of substances such as tar, sulfur and other viscous fluids that are subject solidifying and crystallizing, often require the media to be maintained in a liquid form and use valves that are provided with jackets that contains a hot transfer media such as steam or thermal fluids. The thermal media contained with the jacket transfers heat through the valve to the flowing media keeping it in a liquid form. |
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| LOW
FUGITIVE EMISSION VALVES |
| The global environmental industrial process controls already established, demand that the design of valves, used with highly toxic media, must perform without failure in demanding applications with media such as Chlorine, Phosgene and Hydrogen. The design must ensure the integrity of the valve during operation and the safety of operating personnel managing the process system. Valves designed for this type of application must meet the demands of repeated valve operation, extended temperatures and pressures, and with the facility to detect primary seal failure before the valves integrity is compromised. This design often incorporated such features as secondary stem sealing, live loaded stem packing and the ability to monitor possible leak paths to the environment. |
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| SAFTEY
VALVES |
| Safety Valves are designed to relieve excess pressure from vessels and piping systems carrying products such as steam, non corrosive gases, vapors and other liquids. The valves are spring loaded and, in the instance that the piping or vessel pressure exceeds that potential energy stored in the compressed spring. At this point the valve will open allowing the excess system pressure to be relieved. |
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| SLURRY
VALVES |
| The isolation and control of slurries in piping systems is an arduous application and demands valves that are specifically designed with the heavy abrasive resistant qualities needed for the control of a slurry mixture of suspended solids and liquids. The design of valve for this application relies heavily on the selection of materials, able to resist abrasion and erosion, and the internal design that eliminates cavities and the areas for the slurry to compact and inhibit the operation of the valve.. |
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| STEAM
TRAPS |
| The optimum efficiency and operation of a steam generating plant relies on the correct management of heat energy within the steam system. Steam, when it has surrendered its heat energy, will form condensate which, at that point, must be discharged from the system. This process is managed by steam traps which detect the presence of condensate and discharge it from the system. Steam traps can be of the thermostatic type that reacts to the change in temperature as condensate forms and the float type that, as condensate rises in a receiver, opens to discharge the liquid from the system. |
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