Manual valves - Manual valves in bulk - SIO

Manual Valves

SIO manufactures different types of high-quality manual valves. These valves are simply defined as valves that function using a manual operator, like a handlever or handwheel. They are ideally used when a straightline fluid flow is required and when minimum restriction is needed. They both allow and hinder the flow that passess through the valve either by opening or shutting the gate.

They are made primarily of a bonnet and body, with the closure factor attaching to a stem that retains contact with the handlever or handwheel. Manual valves come in different types including ball valves, butterfly valves, globe valves, and gate valves among others.

You can trust SIO to provide you with top-quality manual valves and even customization services to best meet your needs and specifications.

    High pressure ball valve forged steel

    What Is a Manual Valve?

    A manual valve is a valve that operates through the use of a manual operator, such as a hand lever or handwheel. It is mainly used to start and stop flow, while other valve designs can also be used for throttling.

    An ideal manual valve for on/off services allows flow to go directly through the body with a full-area closure device that has little to no pressure drop. Usually, a manual valve can function as a throttling valve when the manual operator is positioned in a midstroke manner.

    SIO offers a variety of manual valves, all of which exhibit optimum performance for on/off and throttling/controlling services.

    We manufacture ball valves, gate valves, globe valves, and butterfly valves made of durable materials and equipped with essential features to ensure they meet the different needs of industrial applications.

    What are Manual Valve Features?

    Handlever or handwheel-operated

    They use manual operators like handlever and handwheel to perform their functions.

    Simple Design

    • They are composed of a bonnet and body, with the closure factor being attached to a stem that retains contact with the handlever or handwheel.

    Start/stop flow

    Manual valves are capable of starting and stopping the flow of fluids in a system. By opening or closing the gate, they allow or restrict the flow that goes through.

    Control flow

    They can regulate the rate of the flow that passes through a system. They are ideally used when it’s a straight line fluid flow.

    Benefits of Using Manual Valves



    The construction of manual valves is very simple. Most times, a basic hydraulic system does not require complex components. Installing a sophisticated valve in a simple system can reduce its efficiency.


    Because of the simplicity of their design, they’re less expensive to produce, which makes them durable. This is because the simpler a valve’s design, the more durable it is because it won’t have any complex component that can make it break down.


    If you need to automate your operation for some reason, you can convert a manual valve to an electric valve without incurring excessive replacement expenses.

    Standard and Specification of Manual Valves

    ASME & EN Standard

    SIO valves are manufactured according to ASME standards which indicate pressure class as ‘# (lbs.)’ and ‘inches’ for the size. As well as EN standards which indicate pressure class as ‘PN’ and ‘DN’ for the size.


    Manual valve sizes are manufactured to be similar to the sizes of the pipelines they will be used for.

    Pressure Class

    The piping system influences the pressure class that will be most suitable. SIO produces valves with pressure classes ranging from #150 to #2500

    Common Manual Valves Applications

    Manual valves are composed of numerous mechanical properties which make them suitable for several industries. Described below are the most common manual valves applications.

    Oil and Gas Industries

    The manufacturing processes of oil and gas industries often involve the handling of several harsh substances. The operating conditions of these substances often involve high pressure, low pressure, cryogenic applications, and hazardous elements that are corrosive and abrasive. SIO manufactures sturdy manual valves that are highly reliable and capable of handling such hostile conditions, thereby ensuring success.

    Chemical and Petrochemical Industries

    Chemical and petrochemical industries involve dangerous media that are both corrosive and abrasive. Amongst them are petroleum, ethylene, and propylene, all of which could cause major accidents if there is a leakage. As a result, we manufacture strong manual valves that guarantee an absolute seal and are capable to withstand every contaminant even after extended use.

    Food and Beverage

    Food and beverage industries are continuously expanding, necessitating the use of highly-reliable components to keep processing operations working smoothly. The key challenges that these industries have are safety and sanitation, which are resolved by the qualities of manual valves, such as a reliable tight seal and the ability to handle different media properties like cream, grease, oil, and other viscous liquids.

    Power Generation

    Many complex applications are used in power generation plants to ensure that the entire system runs properly. Among them are chemical treatment, cooling systems, pollution control, and steam turbine control systems. To do this, SIO manufactures manual globe valves that are suitable for regulating the flow rate and shutting down media and preventing leaks.

    Manual Valve from China

    SIO is a manual valve manufacturer and supplier that’s based in China. We prioritize safety, efficiency, and cost-effectiveness for all the industries that need automation. 

    Our customized valve manufacturing helps us to fulfill the most difficult specifications. We have a team that’s filled with professional workers who are trained to prioritize the highest standard of quality, resulting in improved products for our customers.

    What Are the Different Types of Manual Valves

    There are different types of manual valves. But depending on the designs and functions, manual valves are generally classified into four types. They are described below.

    Rotating valves

    These manual valves open and close with a quarter-turn rotation. It features a flow pathway directly through the valve body and closure device. Examples are ball valves, butterfly valves, and plug valves.

    Sliding valves

    These are manual valves with a flow-intersecting flat perpendicular closure component. They have a body that allows for the direct flow of fluids. Examples are gate valves, needle valves, and piston valves.

    Flexible valves

    These are manual valves that have an elastomeric or flexible closure device and a body that allows a direct flow. Examples of flexible valves are diaphragm valves and pinch valves.

    Stopper valves

    They use a circular and linear motion closure device that is perpendicular to the middle of the piping. They have a globular body that directs the flow through the correct angle turn above or below the closure device. Examples are globe valves and piston valves.

    Soft or Resilient Seated Butterfly Valve

    Manual Ball Valve

    A manual ball valve is a type of rotating valve excellent for shut-off applications. It uses a ball that makes a 90-degree rotation through a handwheel or lever to open, block, or regulate the flow of gas, liquid, or liquid with suspended solids.

    Butterfly Valve

    A manual butterfly valve is a rotating valve that provides reliable throttling and shut-off services. It uses a hand lever or gear to change the position of the disc, commonly known as the butterfly. Butterfly valve is widely used in chlorine processing, waste water treatment and other services.

    Manual Plug Valve

    A manual plug valve is a quarter-turn valve, which has a solid tapered or cylindrical plug that rotates inside the body to control the media flowing through the valve. Manual plug valve is capable of handling different media types, like gas, condensate, slurries. It is commonly used in pipelines, and power generation.

    Manual Globe Valve

    A manual globe valve is a type of stopper valve primarily used to stop, start, and regulate media flow. The disc moves perpendicular to the seat and can completely open the flowpath and completely close it. It is used for isolation and throttling services.

    Flanged-End Gate Valve
    Stainless-Steel-Needle Valve

    Manual Gate Valve

    A manual gate valve is a type of sliding valve mainly used to stop and start media flow. It is fully opened when the disc is removed from the flow. When it slides down through a manual lever or wheel, it provides a complete shut-off, fully blocking the flow from passing through.

    Diaphragm Valve

    A manual diaphragm valve is made up of a body with two or more ports, an elastomeric disc, and a seat, also known as a “weir” or “saddle.” This manual valve got its name from its flexible disc, that comes into contact with the valve seat found above the body to achieve a positive seal.

    Manual Pinch Valve

    A manual pinch valve is a flexible valve used to stop, start, and throttle process media. This manual valve has a straight-through design allowing it to achieve tight sealing, which is commonly used in pulp and paper industries, and other applications that deal with abrasive media.

    Manual Needle Valve

    A manual needle valve is mainly used to control flow rate accurately and to provide a positive shut-off. It is a sliding valve that has a long-threaded plunger and a slender tapered point that lowers down through the seat to obstruct flow.

    Contact Our Experts

    Send us a message if you have any questions or request a quote.

    We Offer:

    • A reply from our experts within 24 hours
    • The latest detailed product catalugue
    • One-stop service for your project

    Request A Quote

      Please upload only jpg, png, pdf, dwg fliles. (Optional)
      Choose your industry

      Copyright© 2019 Ninbo SIO Fluid Equipment Co., Ltd. All Rights Reserved.

      Request A Quote

        Please upload only jpg, png, pdf, dwg fliles. (Optional)
        Choose your industry