Selection Principles of Y-Type Filters

Selection Principles of Y-Type Filters

Y-type filters, also known as pipeline filters, are commonly used filtration devices on pipelines for conveying media. They are typically installed at the inlet of pressure reducing valves, pressure relief valves, level control valves, or other equipment in water supply systems to remove impurities from the media, preventing mechanical debris from entering the sealing ring and causing seal failure, thus ensuring the normal operation of valves and equipment.

Scope of Application for Y-Type Filters

Y-type filters feature advanced structure, low resistance, and convenient drainage. They are mainly suitable for materials such as:

1. Weakly corrosive materials in chemical and petrochemical production, such as water, ammonia, oils, and hydrocarbons.

2. Corrosive materials in chemical production, such as caustic soda, soda ash, concentrated and dilute sulfuric acid, carbonates, acetic acid, and esters.
3. Low-temperature materials in refrigeration, such as propane, liquid hydrogen, liquid oxygen, and various refrigerants.

4. Materials with hygiene requirements in light industry, food, and pharmaceutical production, such as wine, beverages, dairy products, grain mash, and medical supplies.

Principles for Selection of Y-Type Filters

1. Inlet and outlet diameter: In principle, the inlet and outlet diameter of hydraulic filters should not be smaller than the inlet diameter of the matching pump and should generally be consistent with the inlet pipe diameter.

2. Nominal pressure: Determine the pressure level of the filter based on the highest pressure that may occur in the filtration pipeline.

3. Selection of mesh size: Consider the particle size of impurities to be intercepted and determine based on process requirements. Various specifications of wire mesh can intercept particle sizes as per the "Filter Mesh Specifications" table.

4. Filter material: The material of hydraulic filters is generally selected to be the same as that of the connected process pipeline. For different service conditions, consider selecting hydraulic filters made of cast iron, carbon steel, low-alloy steel, or stainless steel materials.

5. Calculation of filter resistance loss: For water filters, at the rated flow rate, the pressure loss is 0.52~1.2kpa. Common specifications for Y-type filters are 10 mesh, 14 mesh, and 20 mesh. Y-type filters can only be installed in horizontal pipelines, and the direction of flow of the medium must be consistent with the arrow direction marked on the housing.

Maintenance and Installation of Y-Type Filters

The installation of filters requires certain techniques; improper installation can have a significant impact. Understanding specific installation precautions for Y-type filters and maintenance and upkeep practices are essential. Mastering these basic principles will make the entire usage process more convenient. However, it's also crucial to purchase high-quality filters to ensure longer service life.

Pre-installation cleaning:
Clean and tidy threaded connection surfaces facilitate better filter installation. Any debris or other foreign matter can lead to various problems during installation. Ensuring sealing integrity during Y-type filter installation, either horizontally or vertically, prevents issues during use. Otherwise, significant adverse effects may occur.

Regular cleaning of filters:
Regular cleaning is necessary to prolong the service life of filters. Proper maintenance and upkeep of Y-type filters ensure they function effectively for an extended period. Routine maintenance makes operation simple and ensures optimal filtration performance, especially for non-metallic products, meeting various requirements for use.