Production Field of Flanged Butterfly Valve and Resilient Seated Gate Valve

Packing List of ZECO Valves

1. Low Resistance Silent Check Valve DN150-250

2. Resilient Seated Gate Valve DN50-250

3. Flanged Concentric Butterfly Valve DN50-200

4. Iron Gate Valve DN50-200

5. Y Strainer DN150-250

6. Flapper Swing Check Valve DN80-150

Client Feedback of ZECO Water Valves

ZECO valve group not only provides us with high quality and reliable products, and regular return visit and maintenance products more let us feel relieved.

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Hilton Changzhou is located in the central area of Wujin district with a long history in Changzhou, with 299 modern guest rooms and suites,5 restaurants and 2 large banquet halls with an area of 1,500 square meters and 800 square meters respectively. 

Hilton Changzhou opened on October 22, 2014. ZECO has provided the valve solution to its air conditioning system and has been well recognized.

Production Field of Manual Balancing Valves

Packing List of ZECO Water Valves

1. Flow Balancing Valve DN50-200
2. Differential Pressure Valve DN50-200
3. Pressure Reducing Valve DN50-200
4. Resilient Gate Valve DN50-200
5. Y-strainer DN50-200

Client Feedback of ZECO Water Valves

It’s a pleasure to cooperate with ZECO valve group. The quality of products can be guaranteed. We would like to thank you for your help in resolving the problems we have met through consultation and for your timely delivery.

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ZECO Valve Manufacturer provides strainers, floating ball valves, swing check valves and wedge gate valves with high corrosion resistance and high pressure range for Bohai oilfield platform.

Production Field

Packing List:

• Y-Strainer 2inch~14inch
• High Performance Butterfly Valve 10inch~28inch
• Flange Check Valve 2inch~10inch
• Manual Ball Valve 2inch~8inch
• High Pressure Gate Valve 4inch~16inch

Client Feedback:

ZECO Valve is reliable in quality, highly skilled and trustworthy!

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Introduction to Strainer in Piping

Strainer can be defined as a pipe fitting through which liquid is passed for purification, filtering or separation from solid matter; anything used to strain a liquid; any device functioning as a sieve or filter used to prevent solid bodies from mixing in a liquid stream or flowline.

Strainers arrest pipeline debris such as scale, rust, jointing compound and weld metal in pipelines, protecting equipment and processes from their harmful effects, thus reducing downtime and maintenance. Use of rightly selected strainers at correct locations (usually upstream) is a must to protect expensive and critical downstream equipment such as pumps, flow meters, steam traps, control valves etc.

Strainers can be classified into two main types according to their body configuration;

• Y Strainer
• T-Type or Basket Type Strainer

Orientation of Y-Type Strainer

A Y-strainer can be installed in either a horizontal or vertical position (Downward flow) with the screen element pointing downward. This allows the strainer screen to collect material in the strainer at the lowest point of the screen.

In horizontal steam or gas piping, Y type strainer should be installed in such a manner so that the pocket is in the horizontal plane. This stops water from collecting in the pocket which can cause erosion and affect heat transfer processes.

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

Steps for Installing Your Y Strainer in a Vertical Position

Installing a Y strainer (such as one of these) is not difficult, but you will need to make sure everything is aligned properly and facing the right direction.

1. Step 1: Install the blowdown valve (if necessary) at the blow-off connection.
2. Step 2: To ensure maximum efficiency, install a pressure gauge at the inlet and outlet.
3. Step 3: The Y strainer needs to be positioned in the pipeline ahead of any equipment that requires protection. For example, if it is the pump that is requiring protection, the Y strainer should be placed on the suction side of the pump.
4. Step 4: Before you put the Y strainer in place, support the existing pipeline with pipe supports near the inlet and outlet connection.
5. Step 5: The wye side of the strainer must be pointed downward. Ensure there is ample space at the wye side of the strainer for screen removal.
6. Step 6: Place the Y strainer into the pipeline, ensuring that the flow arrow on the body of the Y strainer is pointing in the direction of the pipeline flow.

Installation orientation of the strainer must also be considered. If a vertical installation is planned, a Y-Strainer is the one that will work. Y-Strainers can be installed either vertically or horizontally. A basket strainer must be installed horizontally.

Whether you choose a wye or basket strainer, a spare basket or screen should always be purchased at the same time. A spare screen or basket makes clean-out easier. Just remove the dirty one and install the clean spare one. The line is back in service quicker and the dirty screen can be cleaned or replaced later.

And remember, nothing is quite as useless as a strainer without a basket or screen. If the basket breaks or gets lost or damaged, the line is out of service until a new one is located, purchased and installed. Having a spare on hand avoids this downtime problem.

How to Select a Strainer

Basket strainers and Y-Strainers each have design parameters that will affect their success in specific applications. Taking a little time to identify application specifics will ensure that you select a strainer that will perform as expected in your piping system.

The first thing to determine is the flow rate. Any flow rate over 150 GPM will most likely require a basket strainer because of pressure drop considerations. Strainers are usually sized so that their start up pressure drop is no greater than 2 PSI, with a line velocity not to exceed 8 FPS. On a per size basis, basket strainers exhibit less pressure loss than Y-Strainers. On this website, under Product Downloads, there is a Pressure Loss Calculator.

The next application parameter is difficult to determine, but is important. You need to know just how dirty the process media gets. Y-Strainer screens are smaller in dirt holding capacity than the strainer baskets used in basket strainers. So, in a given application, a basket strainer will go longer between cleanings than a Y-Strainer will.

This is also important because cleaning the screen of a Y-Strainer can be a messy affair compared to a basket strainer. Remember: the strainer leg of the Y-Strainer must be below the pipeline, pointing down, to trap the debris. This means that when the cap is removed to clean the screen of the Y-Strainer, be prepared for any fluid trapped in the strainer to drain out immediately. Depending on the process media, and the location of the strainer, this can be a significant problem.

This problem doesn’t exist with a basket strainer. The hand removable cover of a basket strainer is on top. After making sure there is no line pressure, just screw off the cover and lift out the basket to clean or replace it.

Metal Y-Strainers sometimes have a blow-down connection on the cap to permit cleaning the screen without removing the cap. This is not recommended with a plastic Y-Strainer because the hole in the cap would weaken the strainer and affect its pressure rating.

So, if the application requires infrequent cleaning and the process media is environmentally safe, a Y-Strainer should work. If the opposite is true and the strainer will be cleaned often and the fluid is less than friendly, a basket strainer is the answer. If in doubt, select the basket strainer every time. It may cost a bit more but will stay in service longer between cleanouts, and it will be easier to clean.

If the application requires that the system has to run continuously and cannot be shut down, then the only real choice is a duplex basket strainer.

Size of the perforations in the screen or basket is another consideration. Hayward plastic Y-Strainer screens are only available in 1/32″ perforation. Basket strainers, depending on size, come with 1/32″, 1/16″, 1/8″ or 3/16″ perforation plastic baskets. Stainless steel baskets and screens are available with perforations from 40 microns up to 1/2″, for both basket and Y-Strainers.

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What is a Y Strainer?

Y strainers, also known as wye strainers, are shaped like a “Y” and install inline to prevent solids, pipe scale, rust, and debris from mixing into liquid, gas, or steam in a flowline. Y strainers use perforated or wire mesh straining screens and install vertically or horizontally to protect pumps, meters, control valves, steam traps, regulators, and other process equipment. These strainers are available in a variety of sizes and materials.

Design of Strainer Y Type

As its name implies, a Y strainer is shaped like a “Y and is used to filter, or strain, out particulates from steam, gas or liquid. This mechanical straining process is made possible via a filter element comprised of mesh, perforated metal, or a wedge wire straining element. The most common kind of straining element is a wire mesh. Some also include “blow-off valves that make the cleaning process easier in applications with more substantial dirt blowing. The strainer itself has a compact, Y shaped design. The Y shape has better flow characteristics then for example a T shaped strainer, because the fluid flows through the filter with less change of direction.

Purpose of Y Type Strainer

The y strainer purpose is to remove unwanted particles from steam, gas, or liquid using a straining element typically made of wire mesh. Using this mechanical process in pipelines helps to protect everything from pumps to steam traps. Y strainers are sometimes designed with “blow-off valves” to make the cleaning process easier.

Perhaps the largest benefit that comes from the y type strainer is its flexibility. It can be installed in a vertical or horizontal position, depending on the users’ preference. While this strainer type is already a cost-effective option, the size of y strainers can be reduced to save even more money. This also prevents using excess materials. Y strainers can be made of a variety of materials. The type of material you choose depends on the industry and application that is used. Any type of end that you might need is available as well. From socket to flanged, there is a y strainer out there with the end you need!

The ways in which y strainers can be customized are seemingly endless when compared with other types of strainers. However, the design of a y strainer must be appropriate for the application for this system to be successful. In order to get the right results, always be sure to know the application you are working with before buying a y strainer.

Y Strainer Mesh

Applications of Y-Strainer

Y-Strainers are very cost effective straining solutions in many applications. Where the amount of material to be removed from the flow is relatively small, resulting in long intervals between screen cleanings, the strainer screen is manually cleaned by shutting down the line and removing the strainer cap. For applications with heavier dirt loading, Y-Strainers can be fitted with a “blow-off” connection that permits the screen to be cleaned without removing it from the strainer body.

Y-Strainers are used in a wide variety of liquid straining applications to protect downstream process system components in many industries, including: chemical processing, petroleum, power generation and marine. Water handling applications, where Y-Strainers are used to protect equipment that could be damaged or clogged by unwanted sand, gravel or other debris, are very common.

While often used in many different types of liquid applications, a Y-Strainer is considered the standard for steam applications and is almost universally used for these applications. Its compact, cylindrical shape is very strong and can handle high pressures. It is, literally, a pressure vessel. Y-Strainers which handle pressures up to 6000 psi are not uncommon. Of course, in these cases, the design of the strainer is critical so that it can stand up to these high pressures without fear of failure. When high pressure steam is being handled, another complicating factor arises, temperature. With steam pressures of 1500 psi or higher, standard carbon steel is sometimes not suitable because the steam temperature may be 1000° F or higher. In these cases, the Y-Strainer body is generally made of chrome-moly steel.

Besides steam, Y-Strainers are often used in air and natural gas applications. Here again, high pressures are not uncommon. However, unlike steam high air pressure does not automatically mean high temperature and so, ordinary carbon steel bodies of sufficient wall thickness will generally suffice.

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