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White Paper: Metering Control Valves in RO Systems

In reverse osmosis (RO) systems, metering control valves play a pivotal role. Reverse osmosis is a water purification process that uses a partially permeable membrane to remove ions, unwanted molecules, and larger particles from drinking water. In this context, let's discuss metering control valves in relation to RO systems.
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    Reverse osmosis (RO) has emerged as one of the most effective water purification techniques worldwide. At the heart of its functionality, aside from the semi-permeable membrane, are the metering control valves that ensure optimal flow rates and pressure. This white paper delves into the importance, functionality, and technicalities of metering control valves designed by THINKTANK for RO systems.

    In an age where the quality of drinking water has become a global concern, RO systems have established themselves as the gold standard in water purification. The precision of these systems depends significantly on metering control valves. THINKTANK, with its expertise in valve design and manufacturing, has been at the forefront of this innovation.

    research metering control valves
    research metering control valves

    THINKTANK TRC250/A Metering control valve comes in an expansive variety of materials, tailored for managing liquids, gases, or steam across industrial sectors, research environments, and process pilot plants.
    Due to its streamlined dimensions, it stands out as a top pick for tasks like additive injections, sampling, or low-flow hydraulic systems,

    Metering Control Valves in RO Systems

    Metering control valves in RO systems are used to regulate the flow of feed water, product water, and brine (waste). Their precision ensures that the system operates efficiently and maintains the desired recovery and rejection rates. They can also help in maintaining the right pressure across the RO membrane, which is crucial for efficient filtration.

    Feed Water Flow Control

    The valve can regulate the amount of source water entering the RO system. Proper control ensures the membrane doesn’t get overloaded or underutilized.

    Product Water Flow Control

    After water passes through the RO membrane, purified water (permeate) is produced. The valve ensures the flow rate of this purified water is steady and consistent.

    Brine (Concentrate) Flow Control

    The rejected water with higher concentrations of salts and impurities is called brine or concentrate. A valve is essential to manage its flow rate and prevent undue pressure on the RO membrane.

    Features to consider in a Metering Control Valve for RO Systems


    Given the sensitivity of RO operations, a slight change in flow rate or pressure can impact the system’s efficiency. The valve should offer precise control.


    Since RO systems deal with water, the valve materials should be resistant to corrosion. Stainless steel or high-quality plastic valves are commonly used.

    Size & Design

    Depending on the RO system’s capacity and design, the valve size and design must be chosen to fit seamlessly and work efficiently.


    Over time, scaling or fouling can affect valve operation. Thus, choosing a design that’s easy to clean and maintain can prolong the system’s lifespan.

    Technical Specifications of THINKTANK’s Metering Control Valves

    Size(DN)3/8″, 1/2″, 3/4″, 1″, 1-1/4″
    Seat Diameter(dn)2.5345678101215
    Flow Coefficient CV0.0060.0160.
    Nominal PressurePN16~PN320
    Body Material304、316L、904L、2507、2205、HC276
    ConnectionThreaded Ends(G, NPT, ZG ), Flanged Ends(HG/T20592-2009)
    Rated Travel(mm)1116.5
    Bonnet TypeStandard Type, Cryogenic Type, extension Type, Bellows Type
    Plug TypeNeedle, Cage Type
    Flow CharacteristicsEqual Percentage, Linear Percentage

    Benefits of Using THINKTANK’s Research/Metering Control Valves

    1. Small size and light weight.
    2. The valve body is made of raw material forging, high pressure resistance is outstanding, the valve internal parts can be disassembled, reducing the maintenance cost, to ensure that the equipment can be a long-term stable operation, to eliminate leakage.
    3. High regulation precision, through the electric actuator slowly adjust to control the spool of the valve tiny outlet, to realize the flow of tiny precise control, to maintain the pressure required for the separation of water molecules inside the membrane, to control the discharge of concentrated water.
    4. Eliminate cavitation, high noise, piping vibration and other problems caused by high-speed fluid flow.
    5. Fluid passes through labyrinth type valve cage to realize multi-stage pressure reduction. A full range of valve sizes is available with reduced internals and inherently adjustable ratios up to 100:1 to provide a wide range of flow capacities. Packing seal plus O-ring double sealing ensures that the valve has no external leakage.
    6. Different model of electric actuators are available to meet the needs of low pressure drop to high pressure drop.

    Unique Features

    1. High Precision
      All imported precision electric actuator slowly open and close to control the valve core tiny outlet holes, to realize the flow of tiny precise control.
    2. Long Service Time
      All contact media materials are used 316L/2507/904L and other materials, the structure of the control valve can be disassembled, low maintenance costs, to ensure the long-term stable operation of the equipment. Different needs using different special treatment of the valve needle to ensure that the service life.
    3. Compact Structure Design
      Simple structure, small volume, easy to install, meet the needs of various sizes of flow.
    4. Special Tools
      Equipped with special tools and wearing parts to facilitate late maintenance.

    Served Industries

    • Water & Wastewater
    • Chemical
    • Gas
    • Oil
    • General Manufacturing
    • Pharmaceuticals
    • Aerospace
    working principle for metering control valve
    working principle for metering control valve

    Specialized Conditions

    Concentrated water Metering control valve is a high-precision control valve developed for high-pressure, low-flow fluid control. In the harsh conditions of special water treatment areas, such as waste leachate, seawater desalination, zero discharge of industrial wastewater and other mixed complex composition of the fluid, can provide high-performance regulation and control.
    Concentrated water metering control valve in reverse osmosis RO membrane device, high-pressure reverse osmosis DTRO membrane device, high-pressure reverse osmosis STRO membrane device and so on. By controlling the pressure of the membrane in reverse osmosis, it improves the water production rate of the membrane separation equipment and completes the water quality standard treatment.

    Electric concentrated water metering control valve is mainly used in the concentrated water discharge outlet of high pressure reverse osmosis membrane device, the product mainly plays the following roles in the whole process:

    1. By adjusting the opening of the electric concentrated water control valve, it can control the flow rate of concentrated water discharge, regulate the pressure in the membrane, to ensure the pressure required for water separation in the reverse osmosis membrane, so improve the water production rate of the equipment, and reduce the discharge pressure after the concentrated water adjustment valve.
    2. The electric adjustment is easy to realize remote control.

    Flow Characteristic Curve

    flow characteristic curve
    flow characteristic curve

    TRC250/B Servo Motor Control Valve 1.4539 230VAC 50/60HZ

    Highly Corrosion Resistant Servomotor Control Valve TRC250/B Developed for RO Systems.
    This RO metering valve is designed for precise pressure control in reverse osmosis systems, and the THINKTANK RC250 small control valve is the market leader in this application.
    For most RO applications, we commend the highly corrosion-resistant servo-motor control valve TRC250, which has been specially developed for use in RO systems.

    metering control valve for ro system
    metering control valve for ro system

    This RO metering valve is designed for precise pressure control in reverse osmosis systems, where the THINKTANK RC250/B metering control valve is the market leader in China.
    We recommend the AISI 904L (1.4539) stainless steel valve with AISI 316 SS valve internals. For more corrosive media, we offer duplex stainless steel or Hastelloy valves.
    The valve can also be fitted with a special 3-point or 4-20mA electric actuator for seawater environments.


    • Sizes 1″, 3/4″, 1/2″ and 1/4″
    • 904L Valve Body
    • Suitable For Reverse Osmosis Water Control
    • Many Variants Not Listed Here


    Designed for pressure control in reverse osmosis systems.

    Connections(available in)

    • ¼” NPT ,PN 345
    • 3/8″ NPT ,PN 345 bar
    • ½” NPT ,PN 345 bar
    • ¾” NPT ,PN 100 bar
    • 1″ NPT ,PN 100 bar
    • Special versions for higher pressures are available.

    Valve Body Materials

    • 1.4539 (904L)
    • 1.4404 (316L)
    • Special versions with Duplex® or Hastelloy® materials are available.

    Seals Materials

    • PTFE herringbone rings are standard.
    • Electric actuators
    • Special versions for sea water environments
    • Normal input 3-point control (switching)
    • Optional 4-20 mA input signal (analog)
    • Integration of two adjustable limit switches
    • Power supply: 230 VAC


    The significance of metering control valves in RO systems is undeniable. As a leader in the domain, THINKTANK is committed to ensuring that these vital components are engineered to perfection, ensuring the longevity and efficiency of RO systems globally.

    For more information or for inquiries about our range of products, please do not hesitate to contact THINKTANK’s professional team.

    Picture of Will Don

    Will Don

    After earning my bachelor's degree in mechanical engineering from Zhejiang Normal University in 2008, l was fortunate enough to begin my career with Siemens, Fisher, and YTC, focusing on control valve accessories. Over the past dozen years, l've poured my heart and energy into understanding technology and fluid solutions for control valves.
    Now, as the marketing director for THINKTANK, a trusted branch of the Taiwan STONE valve group, I can't help butf eel proud of how far we've come. Our knowledge isn't just reaching professionals like engineer and valve distributors; it's also inspiring the next generation of automation college students.
    l genuinely hope you're enjoying our articles and finding them helpful.Your thoughts, questions, and feedback mean the world to me, so please don't hesitate to reach out to marketing[at] Whether you're a seasoned expert or just curious about the field, I'm here to connect, share, and learn together.

    All Posts »

    I am the author of this article, and also the CEO and marketing director of THINKTANK, with 15 years of experience in the industrial valve industry. If you have any questions, you can contact me at any time.

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    With expertise in valves and rich experience in the oil&gas, chemical industry, textile mills, power plants, and sugar mills. THINKTANK has become the premier manufacturer of next-generation precision control valves.

    With a customer base that includes over 42 of the world’s leading engineering&contractors and international valve brands, THINKTANK Valves offers cost-effective valves that help our customers achieve automated process control without paying high prices.

    Why are more and more international valve brands choosing THINKTANK for OEM service?

    Brand is reputation, which not only requires high valve technology, but also great comercial support and fast response after-sales service and delivery time. They will not gamble their brand on an unknown product

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