Automatic Control Valves

Introduction to Automatic Control Valves

Automatic Control Valves are valves that use the energy of the flowing media or external control signals to automatically regulate opening, closing, or throttling functions within a system. Unlike manual valves, they respond directly to preset parameters such as pressure, water level, flow rate, or electrical signals. This capability helps maintain stable operating conditions for pipelines and downstream equipment. Automatic Control Valves find wide application in water supply, water treatment, HVAC, fire protection, and industrial applications requiring precise control.

Among these products, Watts automatic control valves have earned strong recognition for their optimized design, continuous-duty performance, and long-term reliability. Watts develops these valves with a main valve body and a pilot control circuit, enabling fast, stable response even as system conditions change. With a broad product range, clear specifications, and strict manufacturing standards, Watts automatic control valves provide effective solutions for a wide variety of engineering applications.

Operating Principle of Automatic Control Valves

In principle, automatic control valves operate based on pressure balance between the control chamber and the main valve. The system uses a pilot valve to sense changes in pressure, water level, or flow rate within the pipeline. The pilot valve then regulates pressure entering or venting from the diaphragm or piston chamber, generating the force required to open or close the main valve without manual operation.

• When system conditions reach the setpoint: The pilot valve maintains stable pressure in the control chamber, keeping the main valve in the required open or closed position.
• When the inlet pressure rises or the water level exceeds the limit: The pilot valve releases pressure from the control chamber, reducing holding force and causing the main valve to open for pressure relief or flow control.
• When pressure drops or flow changes rapidly: The pilot valve restores pressure to the control chamber, allowing the main valve to gradually close or shut completely, minimizing fluctuations and protecting the system.
• During continuous operation: The pilot valve responds in real time, ensuring the main valve remains at the correct operating setpoint for stable and safe system performance.

Watts Automatic Control Valves Product Line

To meet different control requirements in piping systems, Watts offers a wide range of Automatic Control Valves with specific functions and configurations. Each model addresses a dedicated purpose, such as water level control, pressure regulation, flow control, or remotely triggered open/close operation.

Series W-100X-25C

The W-100X-25C series is an automatic float control valve designed to regulate and maintain stable water levels in storage tanks, water towers, and reservoirs. The valve operates with a modulating control mechanism, allowing gradual opening and closing based on the actual water level rather than a simple on/off action. This modulating action helps minimize level fluctuation and reduce water hammer in the system. Its main valve structure, combined with a mechanical float and hydraulic control circuit, provides stable operation, reliable sealing, and long-term dependability in water supply applications.

Below are the key technical specifications of the W-100X-25C series:

• Valve size: DN50 – DN400
• Body material: Carbon steel coated with epoxy
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Test standard: GB/T 13927-2008
• Design standard: JB/T 10674-2006

Series W-200X-25C

The W-200X-25C series is an automatic pressure-reducing valve designed to maintain stable downstream pressure even when inlet pressure or system flow fluctuates. Its pressure pilot control system continuously regulates outlet pressure, keeping it stable within a preset range. With smooth pressure reduction, minimal pressure variation, and reliable sealing performance, the W-200X-25C is developed by Watts Water Technologies for water supply, water treatment, and infrastructure systems that demand precise pressure control.

Below are the key technical specifications of the W-200X-25C series:

• Valve size: DN50 – DN400
• Body material: Carbon steel coated with epoxy
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Design standard: JB/T 10674-2006
• Connection standard: BS EN 1092-1
• Test standards: BS EN 12266-2:2002, GB/T 13927-2008
• Working medium: Water

Series W-300X-25C

The Watts W-300X Non-Surge Check Valve is designed to adjust the valve opening and closing speed, preventing water backflow in the pipe. The valve operates with a main valve body integrated with a hydraulic pilot control circuit, allowing slow, smooth, and stable closing when flow changes suddenly or when pumps stop. This mechanism protects pipelines and downstream equipment, making the valve well-suited for water supply and water treatment systems where high operational safety is essential.

Below are the key technical specifications of the W-300X-25C:

• Valve size: DN50 – DN400
• Body material: Carbon steel coated with epoxy
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Design standard: JB/T 10674-2006
• Test standard: GB/T 13927-2008
• Working medium: Water

Series W-500X-25C

The Watts W-500X Pressure Relief, Sustaining, and Backpressure Control Valve manages pipeline pressure by eliminating excess pressure and holding the system at a preset setpoint, ensuring safe operation throughout. With smooth modulation and high stability, the W-500X-25C helps protect pipelines, reduce overpressure risks, and maintain safe operating conditions throughout the system.

Below are the key technical specifications of the W-500X-25C series:

• Valve size: DN50 – DN400
• Body material: Carbon steel coated with epoxy
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Design standard: JB/T 10674-2006
• Test standard: GB/T 13927-2008
• Working medium: Water

Series W-600X-25C

The W-600X-25C is an electrically actuated automatic control valve designed for on/off flow control in piping systems through electrical signals. The valve pairs a main valve body with a solenoid pilot, enabling precise, stable, and reliable opening and closing operations. Designed for tight sealing, fast response, and continuous-duty performance, the W-600X-25C integrates seamlessly into automated control systems. This valve series is suitable for water supply, water treatment, and infrastructure applications demanding precise shut-off control.

Below are the key technical specifications of the W-600X-25C series:

• Valve size: DN50 – DN400
• Body material: Carbon steel coated with epoxy
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Design standard: JB/T 10674-2006
• Test standard: GB/T 13927-2008
• Operating mode: Open / Close
• Working medium: Water

Series W-700X-25C

The W-700X-25C is an automatic pump control valve designed to protect pumps and piping systems from pressure surges during pump start-up or shutdown. The valve operates through a controlled modulation mechanism, allowing slow opening when the pump starts and controlled closing when the pump stops. This helps reduce sudden pressure impact on pipelines and equipment. A key feature of the W-700X-25C is the coordination between the main valve, pilot control circuit, and electrical signals, ensuring stable and safe system operation.

Below are the key technical specifications of the W-700X-25C series:

• Valve size: DN50 – DN400
• Body material: Carbon steel coated with epoxy
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Design standard: JB/T 10674-2006
• Test standard: GB/T 13927-2008
• Working medium: Water

Series W-800X-16Q/25C

The W-800X-16Q/25C is a self-operated bypass valve designed to maintain a stable differential pressure based on preset system settings. When differential pressure rises, the valve opens automatically; as it decreases, the valve gradually closes – reducing equipment load, minimizing noise, and protecting the system under unfavorable operating conditions. A key advantage of the W-800X is its ability to operate without electrical power, delivering smooth response and stable performance in systems requiring continuous differential pressure control.

Below are the key technical specifications of the W-800X-16Q/25C series:

• Valve size: DN50 – DN400
• Body material: 
  • Ductile Iron Coated with Epoxy (PN16)
  • Carbon Steel Coated with Epoxy (PN25)
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Design standard: JB/T 10674-2006
• Test standard: GB/T 13927-2008
• Working medium: Water

Series W-M110-10

The W-M110-10 is an automatic float control valve designed to maintain stable water levels in tanks, water reservoirs, and storage systems. The valve operates through continuous modulation using a mechanical float combined with a hydraulic control circuit, allowing gradual opening and closing based on the actual water level rather than sudden switching. With its compact structure, easy maintenance, and accurate level control, the W-M110-10 is suitable for residential projects as well as small to medium-sized water supply systems.

Below are the key technical specifications of the W-M110-10 series:

• Valve size: 
  • Thread: DN32 – DN50
  • Flange: DN50 – DN300
• Body material: Ductile Iron Coated with Epoxy
• Nominal pressure: PN16 / CL300 (threaded type)
• Temperature range: 0°C to 80°C
• Design standard: AWWA C530
• Connection types: Threaded and flanged is available
  • Threaded: BSPT CL 300 to ISO 7-1
  • Flanged: PN16 to BS EN 1092-2
• Test standard: ISO/DIS 5208:2007
• Certification: WRAS 1¼“-2” BSPT (F), DN50-DN300 Flanged

Series W-M113-12/6

The W-M113-12/6 is an electrically operated automatic control valve designed to stop or allow fluid flow through pipelines in response to remote control signals. The valve uses a main valve body combined with a solenoid control assembly, enabling clear, reliable, and stable open/close operation during service. A key advantage of the W-M113-12/6 is its compact design, easy maintenance, durable performance, and suitability for various installation conditions.

Below are the key technical specifications of the W-M113-12/6 series:

• Valve size: DN32 – DN50
• Body material: Ductile Iron Coated with Epoxy
• Nominal pressure: PN16 / CL150 / CL300
• Temperature range: 0°C to 80°C
• Design standard: AWWA C530
• Test standard: ISO/DIS 5208:2007
• Connection types: Threaded and flanged available
  • Threaded: CL 300 BSPT to ISO 7-1
  • Flanged: PN16 to BS EN 1092-2 and CL 150 to ANSI B16.42
• Working Status: Open / Close
• Working medium: Water

Series W-M113-46/21

The W-M113-46/21 is a pump control valve designed to minimize water hammer during pump start-up or shutdown. The valve operates through a controlled modulation mechanism, allowing pre-opening or delayed closing according to the preset sequence. This helps protect pumps and pipelines from sudden pressure surges. A key feature of the W-M113-46/21 is the combination of solenoid control and hydraulic operation, ensuring smooth and stable performance.

Below are the key technical specifications of the W-M113-46/21 series:

• Valve size: DN50 – DN200
• Body material: Ductile iron
• Nominal pressure: PN25
• Temperature range: 0°C to 80°C
• Connection standard: GB/T 17241.6
• Working medium: Water

Series W-M115

The W-M115 is a pressure-reducing valve designed to maintain stable downstream pressure in piping systems even when the inlet pressure fluctuates. Its pressure pilot assembly continuously modulates the main valve opening, holding outlet pressure within the preset range. A key advantage of the W-M115 is its accurate pressure reduction, stable operation, and durable construction, making it suitable for municipal water supply, industrial systems, and water transmission pipelines.

Below are the key technical specifications of the W-M115 series:

• Valve size: DN32 – DN300
• Body material: Ductile iron
• Temperature range: 0°C to 80°C
• Nominal diameter:
• Threaded: DN32 – DN50
• Flanged: DN50 – DN300
• Connection standard: GB/T 17241.6
• Working medium: Water

Series W-M116

The W-M116 is a multifunction pressure control valve used for pressure relief when system pressure exceeds the setpoint, upstream pressure sustaining, or back pressure control in piping systems. The valve operates through a pressure pilot assembly, providing an accurate response to preset values and maintaining stable pressure throughout operation. A key advantage of the W-M116 is its flexible application for different installation positions, whether on the main line or bypass line, along with durable construction and high long-term reliability.

Below are the key technical specifications of the W-M116 series:

• Valve size:
  • Threaded: DN32 – DN50
  • Flanged: DN50 – DN300
• Body material: Ductile Iron Coated with Epoxy
• Nominal pressure: PN16 / CL150 / CL300
• Temperature range: 0°C to 80°C
• Design standard: AWWA C530
• Test standard: ISO/DIS 5208:2007
• Connection types: Threaded and flanged available
  • Threaded: CL 300 BSPT to ISO 7-1
  • Flanged: PN16 to BS EN 1092-2, CL 150 to ANSI B16.42, and CL 300 to ANSI B16.42
• Working medium: Water

Series W-M118

The W-M118 series is a slow-closing check valve designed to prevent backflow and reduce water hammer in piping systems. The valve allows fluid to flow in one designated direction and automatically closes via a speed-controlled mechanism, ensuring smooth and stable shut-off when pressure changes suddenly. A key feature of the W-M118 is its independently adjustable opening and closing speeds, which reduce vibration and noise while protecting both pipelines and downstream equipment.

Below are the key technical specifications of the W-M118 series:

• Valve size: DN50 – DN400
• Body material: Ductile iron
• Temperature range: 0°C to 80°C
• Connection standard: GB/T 17241.6
• Working medium: Water

Series  W-M110-14

The W-M110-14 is an on/off float control valve designed to regulate water levels in tanks, reservoirs, and storage systems through two clear operating states: fully open or fully closed. A mechanical float linked to a hydraulic control mechanism triggers full opening or closing at preset high and low water levels. A key feature of the W-M110-14 is its ability to control water level over a wide range, lowering valve switching frequency and extending service life during operation. This valve series is suitable for residential and industrial water supply systems that need stable, durable level control.

Below are the key technical specifications of the W-M110-14 series:

• Valve size:
• Threaded: DN32 – DN50
• Flanged: DN50 – DN300
• Body material: Ductile Iron Coated with Epoxy
• Nominal pressure: PN16 / CL 300
• Temperature range: 0°C to 80°C
• Design standard: AWWA C530
• Connection standards: BSPT to BS21 (threaded), PN16 to BS EN 1092-2 (flanged)
• Working medium: Water

Series W-M115-74

The W-M115-74 series is a pressure-reducing valve built for systems where flow rates vary significantly, from minimal to high demand. A low-flow bypass line ensures accurate pressure control during low-demand operation, while the main valve maintains stable downstream pressure as flow increases. Together, these elements minimize pressure fluctuation, sustain consistent outlet pressure, and enhance reliability during continuous operation. The W-M115-74 excels in water supply and water transmission systems where precise pressure control is needed across a wide range of operating conditions.

Below are the key technical specifications of the W-M115-74 series:

• Valve size:
  • Threaded: DN32 – DN50
  • Flanged: DN50 – DN200
• Body material: Ductile Iron Coated with Epoxy
• Nominal pressure: PN16
• Temperature range: 0°C to 80°C
• Design standard: AWWA C530
• Test standard: ISO/DIS 5208:2007
• Connection standards: 
  • Threaded: CL 300 BSPT to ISO 7-1
  • Flanged: PN16 to BS EN 1092-2
• Working medium: Water

Series M115F/M1115F

The M115F / M1115F series is a pressure reducing valve specifically designed for fire protection systems and certified to UL standards. The valve automatically reduces high inlet pressure to an adjustable downstream pressure and maintains stable outlet pressure even when flow demand or supply pressure changes. This series is available in two configurations: straight pattern (M115F) and angle pattern (M1115F), making it suitable for different fire piping layouts. With stainless steel internal components, a precision pilot control system, and integrated dual pressure gauges, this valve series delivers high safety and reliability for fire protection applications.

Below are the key technical specifications of the M115F / M1115F series:

• Valve types:
  • M115F: Globe
  • M1115F: Angle
• Valve size: DN50 – DN200
• Body material: Ductile iron with red epoxy coating inside and outside
• Nominal pressure:
  • 150# flanged: 12 bar (1200 kPa)
  • Grooved: 20.7 bar (2070 kPa)
• Design standard: UL 1478
• Connection standards:
  • Flanged: ANSI B16.1 / ANSI B16.42
  • Grooved: AWWA C606
• Working medium: Water
• Certification: UL

Series  M116FM/M1116FM

The M116FM / M1116FM series is a pressure relief valve specifically designed for fire pumps, protecting fire protection systems by automatically discharging excess pressure when inlet pressure exceeds the allowable limit. The valve maintains stable pressure at the pump inlet, ensuring the pump and piping system operate within safe limits under different load conditions.

This product series is available in two configurations: straight pattern (M116FM – Globe) and angle pattern (M1116FM – Angle), providing flexibility for various fire system layouts. With UL certification and durable material construction, the M116FM / M1116FM series is well-suited for fire protection systems requiring high reliability and long-term operation.

Below are the key technical specifications of the M116FM / M1116FM series:

• Valve types:
  • M116FM: Globe
  • M1116FM: Angle
• Valve size: DN50 – DN200
• Body material: Ductile iron with red epoxy coating inside and outside
• Nominal pressure:
  • 150# flanged: 12 bar (1200 kPa)
  • 300# flanged: 20.7 bar (2070 kPa)
  • Grooved end: 20.7 bar (2070 kPa)
• Design standard: UL 1478
• Connection standards:
  • Flanged: ANSI B16.42
  • Grooved: AWWA C606
• Working medium: Water
• Certification: UL

Series  WA-M115

The WA-M115 series is an automatic pressure-reducing valve designed to stabilize downstream pressure in water supply systems, even when inlet pressure fluctuates significantly. The valve allows outlet pressure adjustment over a wide range and maintains stable performance from high flow to very low flow conditions. A key advantage of the WA-M115 is its WaterMark certification, standard dual-pressure gauge configuration, and materials approved for potable water applications, ensuring reliable long-term operation. This valve series is well-suited for residential water supply and infrastructure systems requiring precise pressure control.

Below are the key technical specifications of the WA-M115 series:

• Valve size: DN40 – DN300
• Body material: Ductile Iron with Epoxyresin, NSF Certified Coating
• Pressure setting range: 140 – 1200 kPa (factory preset at 500 kPa)
• Temperature range: 0°C to 80°C (for NBR diaphragm and seals)
• Connection types:
  • Flanged to AS 2129 Table E or D as standard (DN50–DN300)
  • Threaded BSPT (DN40–DN50)
  • Grooved to AWWA C606 (DN50–DN150)
• Working medium: Non-corrosive liquids
• Certifications: WaterMark, StandardsMark

Watts Automatic Control Valves – Exclusively Distributed by Toan Cau

Watts automatic control valves are designed to meet pressure control, flow regulation, and operating status requirements in water supply and water treatment systems. The combination of a main valve body and pilot control circuit provides stable response, reliable sealing, and durable performance in continuous-duty applications. With a wide product range and transparent technical specifications, these valves are suitable for both residential projects and industrial systems.

In Vietnam, Toan Cau Building Materials Co., Ltd. serves as the exclusive distributor of Watts automatic control valves. The company also offers globe valves, ball valves, check valves, pressure reducing valves, and specialized system solutions. Toan Cau ensures genuine products, complete technical documentation, and professional consultation based on actual operating conditions. Please contact the hotline 0911 771 551 for product selection support and a fast quotation.