Y-type strainer

Bolaisi Y-type strainers serve as pre-filter units for pipelines, intercepting solid contaminants such as sediment and welding slag to protect downstream pumps, valves and instruments. Available in multiple body materials and nominal diameters, they are compatible with water, oil, gas, steam and other media. The removable screen can be cleaned and reused. Featuring flexible installation options, each unit undergoes multiple factory inspections. Our products are sold worldwide with a 12-month full-unit warranty, and customized specifications are available upon request.

Product Definition

A Y-type strainer is a mechanical purification fitting installed at the front end of fluid pipelines, named after its angled Y-shaped valve body structure. When the medium flows through the valve body, the built-in precision screen intercepts solid particulate impurities contained in the fluid, allowing clean medium to flow toward downstream equipment. Y-type strainers are compatible with water, oil, gas and other media. Standard mesh specifications are as follows: 18–30 mesh for water service, 10–100 mesh for gas service, and 100–480 mesh for oil service. The screen cartridge can be removed for cleaning and reused repeatedly.This product only performs pre-filtration of pipeline impurities without altering the flow rate or pressure of the medium. It can be matched with gate valves, ball valves, globe valves, water pumps, heat exchangers and flowmeters. It reduces abrasion, blockage and unplanned shutdowns of pipeline equipment at the source, significantly cutting costs for equipment maintenance and replacement.

Technical Specifications

1.Brand: Bolaisi

2.Model: GL41H/W-16C/P

3.Nominal Diameter: DN15 ~ DN300

4.Valve Body Material: WCB cast carbon steel / 304 stainless steel / 316 stainless steel

5.Pressure Class: PN10, PN16, PN25, PN40

6.Connection Type: Flanged connection

7.Screen Material: 304 / 316 stainless steel wire mesh

8.Filtration Precision of Screen: Standard 40 / 60 / 80 / 100 mesh (customizable)

9.Applicable Media: Tap water, sewage, oil products, natural gas, steam, etc.

10.Operating Temperature: Cast steel version ≤ 350°C; Stainless steel version ≤ 280°C

11.Fluid Flow Direction: Unidirectional straight through

12.Installation Requirement: Suitable for both horizontal and vertical pipelines; the screen bowl shall face downward.

Product Drawings and Technical Parameters

Warranty Period & Return / Exchange After-sales Regulations

1. Warranty Term

All Bolaisi Y-type strainers come with a 12-month full-unit warranty starting from the date goods leave our factory. Warranty Coverage: Factory-originated quality defects including casting pinholes on valve bodies, flange leakage, damage to original screens, and manufacturing process flaws. Exclusions from Warranty Coverage: Damage caused by unauthorized disassembly and assembly, excessive medium corrosion, impact by hard granular objects, screen clogging & deformation due to irregular blowdown, and operation beyond rated pressure or temperature limits.

2. Return & Exchange Rules

1.Damaged goods upon receipt or factory quality defects: Customers shall provide real photos and video evidence. We offer free replacement or free repair service.

2.Order cancellation by customer unilaterally / incorrect selection of size, parameters or standards: For unproduced orders, partial material liquidated damages will be deducted from the refund. Fully finished and shipped orders are not eligible for unconditional return.

3.Return without quality issues: Goods must remain unopened without usage scratches. The customer shall bear all inbound & outbound international logistics, customs clearance and tariff fees, plus a processing loss deduction for return processing.

Application Fields

1.Municipal Water Supply & Drainage Projects Pre-filtration for urban main tap water pipelines, sewage treatment lines and secondary water supply pump houses. It intercepts sediment and pipeline rust to protect water pumps, water meters and pressure reducing valves.

2.Oil & Gas Industry Crude oil transmission pipelines, gas pressure regulating stations and gas filling station piping. It filters welding slag and metal debris to prevent jamming and malfunction of pressure regulators and flow meters.

3.Chemical Production Lines Heat transfer oil pipelines, weak acid & weak alkali delivery lines and reactor circulation piping. It filters crystalline particles in the medium to extend the service life of valves and heat exchangers.

4.Power Plants & Heating HVAC Systems Boiler feedwater pipelines, high-temperature steam networks and central air conditioning circulating water systems. It removes scale and rust contaminants to avoid blockage of heat exchange tubes.

5.Metallurgy, Papermaking & Textile Industries Cooling water circulation systems and slurry delivery pipelines. It traps solid particles to safeguard rolling mills, water pumps and precision textile control valves.

6.Supporting for Overseas Commercial Equipment Fluid piping of pure water equipment, fuel-fired boilers, cleaning machines and air compressors. Long-term supporting procurement by equipment manufacturers in Europe, America and Southeast Asia.

Why Choose Bolaisi Valves?

1.Direct supply from source factory for foreign trade with no middleman markup We own independent stainless steel and cast steel foundries as well as machining workshops, tailored for overseas markets. We guarantee stable lead times for bulk orders.

2.All-stainless steel precision screen, reusable after repeated cleaning High temperature and erosion resistant with easy disassembly. It can be reinstalled after rinsing with clean water without frequent replacement of consumables, cutting customers’ long-term operating costs.

3.Multiple material options for all working conditions, compatible with complex overseas operating environments Cast steel is suitable for high-temperature steam; 304 stainless steel fits water, oil and gas media; 316 stainless steel works for mildly corrosive fluids. Our products meet diverse operating requirements of chemical, thermal and water supply & drainage projects worldwide.

4.Three-step factory inspection for consistent export-grade quality All products undergo raw material PMI spectrum testing, valve body hydrostatic strength test and sampling inspection of screen filtration precision. A factory inspection certificate is attached to every unit, complying with international fluid equipment standards.

5.Comprehensive foreign trade after-sales system Dedicated foreign trade account managers provide one-on-one service. Spare parts will be shipped promptly for any malfunctions occurring within the warranty period.

Frequently Asked Questions (FAQ)

Q1: Does the Y-type strainer have to be installed horizontally? Can it be used on vertical pipelines? 

A: It is applicable to both horizontal and vertical pipelines. Simply ensure the strainer’s sediment bowl faces downward to facilitate impurity sedimentation and regular blowdown.

Q2: How to select filtration precision? What mesh size is recommended for different media? 

A: 40–60 mesh for tap water and ordinary sewage; 60–80 mesh for oil products and gas; 100–200 mesh for pure water and precision instrument pipelines. Custom mesh sizes are available upon request.

Q3: Cast steel or stainless steel model for 300°C high-temperature steam pipelines? 

A: WCB cast steel Y-type strainer is the preferred choice for 300°C steam, with a maximum temperature resistance of 350°C. Stainless steel versions are recommended for working conditions below 280°C.

Q4: How to clean a clogged screen? Do I need to remove the entire unit from the pipeline? 

A: There is no need to disassemble the valve body flanges. Shut off the front and rear gate valves to release pressure first, then open the bottom blowdown plug to drain dirty water. Loosen the top end cover to take out the screen for flushing and cleaning.

Q5: Can it be fitted with an automatic blowdown valve?

 A: Yes. The blowdown port of all models adopts standard universal thread. Manual ball valves or automatic timing blowdown valves can be installed to realize unattended automatic blowdown.

Q6: Can a corroded or damaged screen be reissued free of charge within the warranty period? 

A: Free replacement will be provided if damage is caused by original material or manufacturing defects. If corrosion damage results from excessive chloride ion, acid or alkali concentration in the medium, it is not covered under warranty, yet replacement screens can be supplied at cost price.