Strainer

Introduction To Strainer

A Strainer is a device installed in piping systems to capture solid debris such as sand, rust, and metal particles carried by the fluid. Through a mechanical mesh filtration process, the strainer helps protect valves, pumps, and measuring equipment from blockage, wear, or reduced performance, thereby maintaining stable operation of the entire system.

In terms of construction, a strainer typically consists of a valve body and a removable screen for periodic cleaning. Depending on operating conditions, strainers can be manufactured from cast iron, stainless steel, or brass to suit different pressure and temperature ranges. Selecting the correct screen size and nominal diameter is important to balance filtration efficiency and flow capacity.

Strainers from Watts Water Technologies stand out for their precise engineering and clear technical specifications. Each product provides transparent information on material, mesh size, pressure rating, and temperature limits, making selection and installation easier. With consistent manufacturing quality and maintenance-friendly design, Watts strainers provide reliable equipment protection and long-term system performance.

Operating Principle Of A Strainer

A Strainer operates through a mechanical filtration process directly within the piping system. When fluid enters the strainer body, the flow passes through an internal screen element. Solid particles larger than the mesh openings, such as sand, rust, or metal debris, are trapped on the screen surface, while the cleaned fluid continues downstream to the connected equipment.

With this operating principle, the strainer helps prevent contaminants from entering valves, pumps, and measuring devices. As a result, it supports efficient system performance, reduces wear, and lowers the risk of equipment damage throughout the piping network.

Watts Strainer Product Line

To meet the practical requirements of different systems, Watts Water Technologies offers a wide range of strainers with various configurations and technical specifications. Each model is designed for specific operating conditions and intended applications. Below are some representative Watts strainer series widely used in the market.

Series W-W4112

The W-W4112 is a ductile iron Y-strainer developed for systems that require stable filtration performance and high durability. Its epoxy-coated ductile iron body provides strong pressure resistance and makes it suitable for large pipeline installations. Compared with many standard strainers, the W-W4112 offers advantages through effective debris retention and low pressure drop, helping systems operate continuously while remaining easy to maintain. This product is widely used in water supply, wastewater, HVAC, irrigation, and commercial or industrial technical systems.

Below are the key technical specifications of the W-W4112:

• Valve size: DN50 – DN600
• Body material: Ductile iron coated with epoxy
• Nominal pressure: PN16
• Temperature range: 0°C to 80°C
• Connection type: Flanged, PN16 to BS EN 1092-2
• Test standard: ISO/DIS 5208:2007
• Working medium: Water, sewage

Series W-YG41-25C

The W-YG41-25C is a Y-strainer built for systems that demand high working pressure and stable flow performance. Its carbon steel body paired with a stainless steel screen enables reliable operation in demanding conditions such as oil & gas, chemical processing, and water treatment applications. Compared with many standard strainers, the W-YG41-25C delivers low flow resistance and superior dirt-holding capacity, helping support continuous system operation. It is a suitable choice for technical projects that require reliability and long-term durability.

Below are the key technical specifications of the W-YG41-25C series:

• Valve size: DN50 – DN450
• Body material: Carbon Steel with Spray Paint
• Nominal pressure: PN25
• Temperature range: -20°C to 120°C
• Test standard: GB/T 13927-2008
• Design standard: GB/T 14382-2008
• Working medium: Water, sewage

Series W-JZG44-16Q

The W-JZG44-16Q is a pump diffuser specially designed for systems that require improved flow quality and pump protection at the suction side. The unit integrates pipe reduction, filtration, and flow straightening functions into one compact assembly, helping reduce the number of pipeline accessories. With an optimized arrangement of the flow straightener and screen element, the product helps minimize turbulence, cavitation, and operating noise. Compared with conventional installation methods, the W-JZG44-16Q provides a cleaner, more stable solution for water treatment, chemical processing, and metallurgical systems.

Below are the key technical specifications of the W-JZG44-16Q series:

• Valve size: DN50 – DN600
• Body material: Epoxy-coated ductile iron
• Nominal pressure: PN16, PN25
• Temperature range: -20°C to 120°C
• Test standard: GB/T 13927-2008
• Connection standard: GB/T 17241.6-20
• Working medium: Water

Series W-YG11-16P

The W-YG11-16P is a threaded Y-strainer made of stainless steel, developed for small piping systems that require stable filtration performance and high durability. Its stainless steel body and screen help maintain reliable sealing, strong corrosion resistance, and suitability for continuous operation. With a compact structure and standard threaded connection, the product is easy to install and convenient for screen removal and cleaning. The W-YG11-16P is commonly used to protect pumps, meters, valves, and other valuable equipment in water supply, drainage, and building service systems.

Below are the key technical specifications of the W-YG11-16P series:

• Valve size: DN15 – DN50
• Body material: Stainless steel CF8
• Nominal pressure: PN16
• Temperature range: -29°C to 200°C
• Test standard: GB/T 13927-2008
• Connection standard: GB/T 7307-2001
• Connection type: Threaded
• Working medium: Water

Series W-YG41-16P

The W-YG41-16P is a flanged Y-strainer made of stainless steel, designed for piping systems that require high cleanliness and long-term operating stability. Its stainless steel body and screen provide strong corrosion resistance, making it suitable for water applications with strict quality control requirements. Compared with cast iron or carbon steel strainers, the W-YG41-16P offers better material durability and more precise filtration performance. It is commonly installed to protect pumps, flow meters, valves, and mechanical equipment in water supply, drainage, and technical building systems.

Below are the key technical specifications of the W-YG41-16P series:

• Valve size: DN50 – DN300
• Body material: Stainless steel CF8
• Nominal pressure: PN16
• Temperature range: -29°C to 150°C
• Test standard: GB/T 13927-2008
• Connection standard: JB/T 79.1-1994
• Connection type: Flanged
• Working medium: Water

Series YG11-20

The YG11-20 / 20N is a bronze Y-strainer developed for small piping systems that require high stability and durable performance. Its bronze body makes the unit suitable for potable water, hot water, and common water treatment applications. Compared with many cast iron or steel strainers, the YG11-20 offers lower flow resistance and easier cleaning procedures. This Watts Water Technologies series is widely selected for residential systems and light technical applications due to its flexibility and long-term reliability.

Below are the key technical specifications of the YG11-20 / 20N series:

• Valve size: DN15 – DN50
• Body material: Bronze CC491K
• Nominal pressure: PN20
• Temperature range: 0°C to 170°C
• Test standard: BS6755
• Connection standard: Threaded to BS21 BSPT, available with NPT threading (Model YG11-20N)
• Connection type: Threaded
• Working medium: Water, oil, gas
• Certification: WRAS

Series W-WB551

The W-WB551 series is a brass Y-strainer designed for small piping systems needing stable performance and reliable sealing. Its brass construction ensures dependable operation in cold water systems and common water treatment applications. Against many cast-iron or steel strainers, the W-WB551 stands out with a compact structure, low flow resistance, and quick cleaning access. This product is well-suited for protecting valves, pumps, and measuring equipment in residential systems and light technical applications.

Below are the key technical specifications of the W-WB551 series:

• Valve size: DN15 – DN50
• Body material: Brass HPb59-1
• Nominal pressure: PN25
• Temperature range: -30°C to 95°C
• Test standard: GB/T 13927-2008
• Connection standards: Threaded NPT (ASME B1.20.1), BSPT (BS 21), or G thread (GB/T 7307)
• Working medium: Water, oil, and gas

Series Y-STRAINERS-AUS

The Y-Strainer is a compact Y-type strainer designed for small piping systems that require protection against dirt, debris, and suspended particles in the fluid. With its streamlined body and efficient flow path, the product helps minimize pressure loss during operation. Compared with many conventional strainers, the Y-Strainer features a simple design that allows easy screen removal for routine cleaning. This series is suitable for systems using non-corrosive liquids where stable performance and easy maintenance are required.

Below are the key technical specifications of the Y-Strainer series:

• Valve size: DN15 – DN50
• Body material: DZR brass 
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Test standard: AS 3688-2005
• Design standard: AS 3688-2005
• Thread type: G thread
• Working medium: Non-corrosive liquids
• Certification: WaterMark

Series W-YS01

The W-YS01 is a Y-strainer designed for water systems that require stable operation and long-term equipment protection. Its robust body, combined with a stainless steel screen, helps effectively retain solid impurities carried in the fluid. Compared with many common strainers, the W-YS01 is suitable for medium to large pipeline sizes and supports continuous operating conditions. This product is widely used in non-corrosive water systems for technical buildings and infrastructure projects.

Below are the key technical specifications of the W-YS01 series:

• Valve size: DN50 – DN300
• Body material: Cast iron
• Nominal pressure: PN16 (1600 kPa)
• Temperature range: -10°C to 90°C
• Test standards: BS EN 12266-2003, GB/T 13927-2008
• Connection standard: AS2129 Table D & E (flanged)
• Working medium: Non-corrosive liquids

Series W2000

The W2000 series is a stainless steel strainer developed for systems that require high cleanliness standards and convenient maintenance. Its stainless steel body, combined with a fine mesh screen, helps effectively remove small impurities from the fluid, making it suitable for liquid cooling applications. A key advantage of the W2000 is the option of welded or clamp connections, allowing flexible installation and meeting technical requirements in industrial environments. This product is commonly used in systems that demand fluid quality control and stable operation.

Below are the key technical specifications of the W2000 series:

• Valve size: DN15 – DN100
• Body material: Stainless steel
• Nominal pressure: PN10
• Temperature range: -10°C to 100°C
• Test standard: GB/T 13927
• Connection standards:
  • Welding: DIN 11850 / ISO 2037
  • Clamp: DIN 32676 / ISO 2852
• Working medium: Water, ≤50% ethylene glycol

Toan Cau – Exclusive Distributor Of Watts Strainers In Vietnam

Watts strainers are developed to strict engineering standards, focusing on filtration efficiency, material durability, and stable long-term operation. The product range is clearly organized by material type, connection style, and size range, helping engineers and contractors choose the right solution for water supply systems, HVAC applications, and industrial projects.

In Vietnam, Toan Cau Building Materials Co., Ltd. is the exclusive distributor of Watts strainers. In addition to the strainer range, Toan Cau also supplies a full selection of other Watts flow control products, such as automatic control valves, pressure reducing valves, safety valves, air vent valves, and related solutions, supporting integrated piping systems for residential and industrial developments.

With more than 18 years of experience, Toan Cau is trusted by many partners for accurate consultation, genuine products, and clear technical support tailored to each project. For technical information or a detailed quotation, please contact the hotline 0911 771 551.