Mudbox/Strainers*

Mudbox/Strainers* 

Filters for ships seawater inlet are commonly called mud boxes, while filters for other applications often are referred to as strainers. The internals of the mud box and strainers are called strainer basket and comes in different mesh sizes, i.e. sizes of the strainer basket penetrations.

Subcategories

  • Foot Valve
    Foot Valve

    Overview:

    A foot valve is a type of check valve that is typically installed at a pump or at the bottom of a pipe line (hence the name). Foot valves act like ball check valves, but have an open end with a shield or screen over it to block debris from entering the line. The valve opening is designed to be larger than the line itself, minimizing head loss.

    Foot valves can be found in ponds, pools and almost anywhere there is a pump. These special valves allow the pump to stay primed, letting liquid to flow in, but keeping it from flowing back out. The screens or baskets that cover the valve opening tend to get clogged over time, especially in ponds and wells. It is important to check and clean your valves regularly for optimum performance.

    Construction:

    Like most valves, foot valves come in a variety of materials. While each foot valve will be slightly different, the general design is universal. Look at this PVC foot valve we've taken apart below. It consists of The main valve body and line connection, the ball, the seal carrier, the seal, and the screen. You' notice that this valve can be fully disassembled for cleaning.

    This particular model, which you can order direct from us, has a specially designed ball mechanism. This is not a standard sphere, but a weighted cup design that allows for superior functionality and durability. Unlike most ball-style valves, this valve ball will not spin in place or create worn areas that allow for leaks.

  • Mudbox
    Mudbox

    Filters for ships seawater inlet are commonly called mud boxes, while filters for other applications often are referred to as strainers. The internals of the mud box and strainers are called strainer basket and comes in different mesh sizes, i.e. sizes of the strainer basket penetrations.

  • Strainers
    Strainers

    Filters

    Whilst strainers remove all visible particles in the steam, it is sometimes necessary to remove smaller particles, for example, in the following applications:

    • When there is direct injection of steam into a process, which may cause contamination of the product.

    Example: In the food industry, and for the sterilisation of process equipment in the pharmaceutical industry.

    • Where dirty steam may cause rejection of a product or process batch due to staining or visible particle retention.

    Example: Sterilizers and paper/board machines.

    • Where minimal particle emission is required from steam humidifiers.

    Example: Humidifiers used in a ‘clean’ environment.

    • For the reduction of the steam water content, ensuring a dry, saturated supply.

    In such ‘clean steam’ applications, strainers are not suitable and filters must be used. A filter used in a steam system typically consists of a sintered stainless steel filter element. The sintering process produces a fine porous structure in the stainless steel, which removes any particles from fluid passing through it. Filters capable of removing particles as small as 1 μm are available, conforming to the good practice needs of culinary steam.

  • Basket Strainers
    Basket...

    Basket type strainer units

    The basket type or pot type strainer is characterised by a vertically orientated chamber, typically larger than that of a Y-type strainer. Size for size, the pressure drop across a basket strainer is less than that across the Y-type as it has a greater free straining area, which makes the basket type strainer the preferred type for liquid applications. As the dirt holding capacity is also greater than in Y-type strainers, the basket type strainer is also used on larger diameter steam pipelines.

    Basket type strainers can only be installed in horizontal pipelines, and for larger, heavier basket strainers, the base of the strainer needs to be supported.

    When basket type strainers are used on steam systems, a significant amount of condensate may be formed. Consequently, strainers designed for use in steam systems usually have a drain plug, which can be fitted with a steam trap to remove the condensate.

    Basket type strainers are commonly found in a duplex arrangement. A second strainer is placed in parallel with the primary strainer, and flow can be diverted through either of the two strainers. This facilitates cleaning of the strainer unit whilst the fluid system is still operating, reducing the downtime for maintenance.

  • Dual Filter
    Dual Filter

    As the marketplace becomes increasingly competitive, more emphasis has been placed on reducing plant downtime and maintenance. In steam and condensate systems, damage to plant is frequently caused by pipeline debris such as scale, rust, jointing compound, weld metal and other solids, which may find their way into the pipeline system. Strainers are devices which arrest these solids in flowing liquids or gases, and protect equipment from their harmful effects, thus reducing downtime and maintenance. A strainer should be fitted upstream of every steam trap, flowmeter and control valve.

    Strainers can be classified into two main types according to their body configuration; namely the Y-type and the basket type. 

    Y-type Strainers

    For steam, a Y-type strainer is the usual standard and is almost universally used. Its body has a compact cylindrical shape that is very strong and can handle high pressures. It is literally a pressure vessel, and it is not uncommon for Y-type strainers to be able to handle pressures of up to 400 bar g. The use of strainers at these pressures is however complicated by the high temperatures associated with steam at this pressure; and subsequently exotic materials such as chrome molybdenum steel have to be used.

    Although there are exceptions, size for size, Y-type strainers have a lower dirt holding capacity than basket strainers, which means that they require more frequent cleaning. On steam systems, this is generally not a problem, except where high levels of rust are present, or immediately after commissioning when large amounts of debris can be introduced. On applications where significant amounts of debris are expected, a blowdown valve can usually be fitted in the strainer cap, which enables the strainer to use the pressure of the steam to be cleaned, and without having to shut down the plant.

    Y-type strainers in horizontal steam or gas lines should be installed so that the pocket is in the horizontal plane  This stops water collecting in the pocket, helping to prevent water droplets being carried over, which can cause erosion and affect heat transfer processes.

    On liquid systems however, the pocket should point vertically downwards this ensures that the removed debris is not drawn back into the upstream pipework during low flow conditions.

    Although it is advisable to install strainers in horizontal lines, this is not always possible, and they can be installed in vertical pipelines if the flow is downwards, in which case the debris is naturally directed into the pocket  Installation is not possible with upward flow, as the strainer would have to be installed with the opening of the pocket pointing downwards and the debris would fall back down the pipe.

    Straight and angle type strainers

    In addition to Y-type strainers, several different body configurations are used in steam systems, namely straight and angle type strainers. These are shown in  These types of strainer function in a similar way to the Y-type strainer and have similar performance. They are used when the geometry of the steam pipework does not suit a Y-type strainer being used.

Products in this Category

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Showing 1 - 9 of 17 items
  • More about 482151 - Mudbox Mudbox PN 4 Flange Angle GG25 Variants: Other mesh-sizes With test valve Other dimensions/materials on request   Standard Mesh-size: DN 40- 65 5x5 mm DN 80-500 8x8 mm   Flanges drilled according to PN10   *DN 400 L1/L2 520 *DN 600 L1/L2 720
  • More about 482021 - Mudbox Mudbox PN 4 Flange Straight Bronze Variants: Other mesh-sizes With test valve Other dimensions/materials on request   Flanges drilled according to PN10   Standard Mesh-size: DN 40- 65 5x5 mm DN 80-500 8x8 mm
  • More about 482051 - Mudbox Mudbox PN 4 Flange Straight GG25 Variants: Other mesh-sizes With test valve Other dimensions/materials on request   *DN 300 L 700 *DN 350 L 690/800   Flanges drilled according to PN10   Standard Mesh-size: DN 40- 65 5x5 mm DN 80-500 8x8 mm
  • More about 482061 - Mudbox Mudbox PN 4 Flange Straight Hot dip galvanized steel   Variants: Other mesh-sizes With test valve Other dimensions/materials on request   Standard Mesh-size: DN 40- 65 5x5 mm DN 80-500 8x8 mm   Flanges drilled according to PN10
  • More about 482061 - Mudbox Mudbox PN 4 Flange Straight Hot dip galvanized steel   Variants: Other mesh-sizes With test valve Other dimensions/materials on request   Standard Mesh-size: DN 40- 65 5x5 mm DN 80-500 8x8 mm   Flanges drilled according to PN10
  • More about 482294 - Stainers Stainers PN 40 Thread Straight SS316 Variants: Other mesh-sizes Other dimensions/materials on request
  • More about 483498 - Strainer Strainer ANSI 300 Flange Straight CF8M Variants: Other dimensions/materials on request
  • More about 485061 - Stainers Stainers Straight Galv.Steel Variants: Stainless Steel Other dimensions/materials on request  
  • More about 483492-483491 - Stainers Stainers PN 16/10 Flange Straight SS316 Variants: Other mesh-sizes DN200-250 available PN16 Other dimensions/materials on request
Showing 1 - 9 of 17 items

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