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    What Exactly Is A Globe Valve?

    Throttle globe valves use a linear motion to move a closure into and out of the valve seat, with the valve body being a spherical chamber. They are designed to control process flow, pressure, or temperature when combined with an actuator assembly. A cage or retainer-style design is used in many single-seat bodies to hold the seat seal, provide plug guiding, and give a method for determining the flow characteristics of a specific valve. Single-seat globe valve bodies with cage or retainer structure may also easily adjust flow characteristics by changing the trim, enabling decreased capacity flow, noise reduction, or decreasing or eliminating cavitation.

    pneumatic globe valves

    How Globe Valve Works

    globe valve manufacturer

    Typical Applications

    Globe valves provide users exceptional performance and reliability and come in a range of sizes from DN15 to DN900. They can assist in meeting a variety of application demands, from general to severe, small size to big size, hot temperature to cold temperature.
    Different kinds of bonnets are offered to handle various application temperatures. To protect packing materials when the valve is used in highly hot or cold situations, this principally includes basic bonnets and optional extension bonnets.

    For situations where the packing system must keep fugitive emission concentrations below environmental requirements, there are additional specific packing arrangements.

    Boiler and main steam vents and drains, fuel oil systems, feedwater or chemical feed systems, turbine lubrication oil systems, and cooling water systems are just a few of the many places where globe valves are used.

    Adaptability Of Valve Plugs

    Globe valves can be equipped with either balanced or unbalanced valve plugs. Balanced plugs permit equal process pressure above and below the valve plug, with the normal flow down through the seat ring. Unbalanced valve plugs are solid with no through the hole, and flow is typically upward via the seat ring.

    There are various ways to guide the plug in globe valves, the most popular of which are cage guided and post-guided. Cage-guided assemblies come in both balanced and unbalanced plug configurations. This method of guiding employs the outside diameter of the plug to touch the inside diameter of the cage, which provides excellent plug stability and alignment but necessitates extremely tight tolerances between the plug and cage. The seat retainer is used in place of the retainer in the post-guided assembly. The seat retainer has a guide cage that guides the post on the plug. Because this method provides for an unobstructed flow route around the plug, the back-guided trim is better appropriate for viscous and unclean fluids.

    Trim Designs

    Globe valves can be linear, equal percentage, or quick opening and can satisfy capacity demands from 0.001 Cv up to 12,000 Cv through a variety of trims with various flow characteristics. 

    Additionally, there are specialty trims that may be used in clean or unclean applications to stop noise and cavitation problems.

    What Is Globe Valve Used For?

    A globe valve can be opened, closed, or adjusted to the desired flow rate. Valves can be manipulated either manually or mechanically.

    As an example, the petroleum sector uses globe valves because they have several benefits.
    Globe valves are often used in control and isolation systems. This motion is straightforwardly linear. Since this is the case, it can quickly allow or restrict fluid flow. It makes for a secure seal. This is why globe valves are commonly utilized in the petroleum industry.

    What Is The Difference Between Globe Valve And Gate Valve?

    Internal Components Differ Between Gate Valves And Globe Valves

    A gate valve’s closing element is a plate or disk like a “gate” that is parallel to the plane of the valve seat.

    The globe valve’s closing part, known as the “plug,” travels perpendicular to the plane of the valve seat.

    Gate Valves And Globe Valves Serve Different Purposes

    Globe valves have a high capacity for throttling, but gate valves are not employed for throttling. Gate valves are ideal for isolation, whereas globe valves are ideal for regulating or throttling.

    globe valve flow direction
    gate valve flow direction

    Globe Valve Vs. Gate Valve

    Globe and gate valves are the most common types of valves in the industry, each having its own unique functions and design features. Below, we highlight the key distinctions between globe valves and gate valves:

    Globe Valve

    Gate Valve

    Used to Open, Close, or Control the Fluid Only Used to Open or Close the Fluid
    High-pressure Drop Low-Pressure Drop
    Single-Way Direction  Bidirectional Valve
    Complicated DesignSimple Design
    High Maintenance CostsEasy Maintenance
    Expensive than Gate Valves Based on Same Size and MaterialLower Cost than Globe Valve
    Complex Design & StructionSimple Design

    Globe Valve

    For newbies, the gate valve may be very similar to the globe valve. But if you take close look at these two different valves, you will find the gate valve is much simple, a gate/disc you can see at the top of the valve body. When the gate valve is opened, the gate/disc will upward action, and complete on the top part of the bonnet, and the body becomes hollow. 

    But for the globe valve, the plug and seat are complete inners of the valve body. The design permits impediments that help the globe valve in its primary function of throttling and providing positive shut-off. Additionally, the design allows for variations in flow rate and direction, which can lead to a high-pressure drop.

    When compared to a gate valve, a globe valve cannot close tightly. Pipeline gate valves provide a tight shut-off feature. Gate valves are utilized upstream of globe valves due to their tight shut-off abilities. This gate and globe valve combination may have been visible at the discharge pipe of a pump.

    A globe valve needs more torque to operate. This higher power consumption for globe valves is also taken into account when constructing automated and motorized valve actuators.

    When gate valves are used to regulate flow, we witness noise, vibration, and seat/disk damage, so gate valves were not designed to regulate flow. In the event that a gate valve is unavailable, a globe valve might be utilized to stop and start the flow. Generally speaking, a gate valve is only utilized for isolating fluid. As designs exist for both directions of flow, a gate valve can be utilized in either direction.

    The opening and closing geometry of the valve disc/plug and seat also differ between globe valve and gate valve.

    Globe valves can be maintained in place, while almost all gate valves need to be removed from the piping system in order to make repairs for leakage problems.

    A gate valve will bind and be impossible to open against a large differential pressure, while a globe valve can. The seat will score and leak if you attempt to open against high differential pressure.

    The gate valve is perfect for uses where low-pressure losses are essential. It is a multidirectional valve. The globe works best in settings where large pressure variations are not a concern. Globe valve only has one direction, and you will see an arrow mark on the body to show the flow direction.

    Gate valves are linear valves that belong to the family of shutoff valves. The gate valve is widely used to isolate media because its wedge-shaped disc can effectively shut off fluid. This type of valve is suitable for applications requiring a tight seal. For thicker and more viscous fluids, the knife gate valve is the best choice.

    Since there is no blockage in the media flow path, gate valves only cause minor pressure drops. The valve opens by the upward movement of the gate disc. It closes by lowering the disc to connect with the seats. The disc of a gate valve can be shaped as a wedge, a knife, or a parallel plane.

    The gate valve is not utilized to control the flow of media, although having considerable throttling capacity. Due to the thinness of its disc, it might get misaligned from its seat as a result of media vibration. Its service life is shortened and harm is caused by this situation. The gate valve should completely open or fully close when in operation to increase the lifespan of the valve.

    globe valve drawing 300lb

    Globe Valve Symbol

    Each type of valve is represented by a different symbol. The globe valve is denoted by the symbol:

    valve status symbols
    valve status symbols
    industrial valve symbols
    industrial valve symbols

    What Is The Advantage Of Globe Valve?

    • Excellent shutdown capabilities
    • Throttling capacity ranging from moderate to excellent
    • Shorter Travel(compared to a gate valve)
    • Available in tee, wye, and angle designs, each with its own set of advantages
    • Seats are simple to machine or resurface
    • Globe valve can be utilized as a stop-check valve when the disc is not connected to the stem.

    What Is The Disadvantage of Globe Valve?

    • High-pressure loss (compared to gate valve)
    • Requires higher force to drive the valve to open or close.
    • Obstructions and channel discontinuities can generate a considerable pressure decrease.
    • Pulses and shocks in large high-pressure pipes can damage decorative parts on the inside.
    • Heavier compare to gate valve
    • More complicated design than gate valves.
    • One direction fluid way

    Globe Valve VS. Ball Valve

    Here is what makes a globe valve different from a ball valve:

    Globe Valve

    Ball Valve

    Best suited for controlling, opening, and closing flowsExcellent for opening and closing services
    Utilizes a plug to open, close, and control flowA ball is used to open and close the flow
    The valve’s plug and stem move in a straight lineThis valve’s ball and stem move in rotary
    High-pressure dropLow-pressure drop
    Linear motion valveRotary motion valve

    What Is A Globe Gate Valve?

    Globe valves are control valves that are used to control, start, and stop the flow of media through a pipe. They feature a spherical body shape the appearance; on the inside, a plug fits on the end of a threaded rotating stem that is upward and downward to control media flow. Globe valves are a type of linear motion valve, which indicates that the valve mechanism moves in a straight line.

    Globe valves provide a tight seal with minimum leakage, making them a great choice in high-pressure industrial pipe systems.

    Gate valves are excellent for applications requiring tight shutoff or isolation. In the half-open state, gate valves cannot withstand a strong flow of media and are thus not utilized to regulate flow. They are utilized in industrial oil and gas pipe systems, water systems, and maritime sectors.

    What Is Another Name For A Globe Valve?

    Globe valves can alternatively be referred to as throttling valves or throttle trip valves.

    Throttle Trip Valves are a single, highly reliable valve assembly that can control flow and shut off in an emergency. The throttling valve controls the flow of steam and gas in large, high-pressure pipelines, like the main steam line for a high-pressure turbine or the gas supply line for a turboexpander. As trip valves, they add a crucial level of safety to these uses without the cost of a separate trip valve. When manually or automatically tripped, the valves quickly stop the flow of water to protect expensive equipment.

    Advantages

    When the throttle trip valve is opened, the pressure on the main disc is released by a pilot valve inside the valve. The seal-welded seat ring fits tightly to the body and has an expansion groove to keep the seating face from distorting. Gaskets of the flexitallic type seal well at all cover joints. The yoke and latching assembly are made to be easy to adjust while it is in use. To save space and enable the use of smaller operators, venturi seats can be offered in high-pressure applications. For direct connections to steam turbines, valves can be made with either welded ends or ANSI flange connections.

    Is A Needle Valve A Globe Valve?

    A needle valve is used to precisely regulate the flow of clean gases or liquids. Smooth flow control is achieved by gradual changes to the stem and plunger. The needle valves often feature a small flow capacity and a large pressure drop. Standard needle valve port diameters range from DN2 to 12 mm(1/8″ to 2″). A needle valve’s most typical application is to regulate gas flow, such as propane in a tank. Need valve is a kind of globe valve.

    Control Valves Types

    a. According to the Function of the Control Valves

    A pneumatic on/off valve is used for tight closing applications for liquids, gases, and vapors. It has standard options such as temperature extensions and metal bellows seals.

    As this control valve is designed according to the modular assembly principle, so it can be assembled with a pneumatic actuator and an option with a handwheel, it also can be equipped with other accessories, such as limit switches, solenoid valve, and so on.

    Features & Benefits

    • Compact designed Pneumatic On/OFF Valve
    • Easy addition of handwheel, metal bellows seal, and thermal extensions
    • Bonnet and body made of the same material for process compatibility
    • Class VI shut-off with PTFE insert in the plug

    hsc pneumatic single seated cage type control valve

    Modulating type control valves include single-seated control valves, double-seated control valves, angle type control valves, cage guided control valves, and so on.

    For example, cage guided type balanced trim, movement balanced ring, fission labyrinth type standard cage, optional movement seal ring, high strength structure. The 510D series is the most pointed control valve in the high differential pressure operating mode, has used the labyrinth type valve cage, has the characteristic which multistage falls pressure, the multilayered labyrinth gasket type valve can reduce the fluid noise and eliminate cavitation as well as the multi-hole cage valve. Moreover, reduces the volume greatly, the trim in the valve is interchangeable between the HCB series control valve with the HSC series Cage Guided control valve.

    pneumatic control globe valves

    A self-acting control valve is also known as a self-operated pressure regulator, which doesn’t need any auxiliary power to drive the valve, the self-acting control valve through the medium energy to operate the valve itself, that’s why it is called self-acting or self-operated. A self-operated control valve can realize the adjustment of temperature, pressure, differential pressure, flow rate, and other parameters. It has the characteristics of simple structure, low price, reliable action, and so on. It is suitable for occasions where flow rate changes are small, adjustment accuracy is not high, or instrument air/power supply is difficult.

    图片6

    b. According to the Nominal Pressure of the Control Valves

    Nominal Pressure PN of Control Valves Less Than 1.6MPa

    Nominal Pressure PN of Control Valves Range 2.5 to 6.4MPa

    Nominal Pressure PN of Control Valves Range 10.0 to 80.0MPa

    Pneumatic top guided single-seated angle control Valve applied with an unbalanced plug, this top guided single seated angle control valve requires a large actuator output force. The size is reduced by incorporating a fine designed multi-spring diaphragm actuator. This series is a good application for slurry polymer crystallization and high-temperature fluid as the pressure balanced structure is not used here.

    510D Model is adopted cage guided type balanced trim, movement balanced ring, fission labyrinth type standard cage, optional movement seal ring, high strength structure. The 510D series is the most pointed control valve in the high differential pressure operating mode, has used the labyrinth type valve cage, has the characteristic which multistage falls pressure, the multilayered labyrinth gasket type valve can reduce the fluid noise and eliminate cavitation as well as the multi-hole cage valve. Moreover, reduces the volume greatly, the trim in the valve is interchangeable between the HCB series control valve with the HSC series Cage Guided control valve.

     

    c. According to the Different Actuator Type For Control Valves

    manual control valves manufacturer
    manual control valves supplier

    A manual control valve uses a handwheel or handles to operate the valve, it is also called a blowdown valve.

    electric globe type control valves
    electric globe type control valves

    Electric globe type control valves use electric or motorized actuators to drive the control valve to open, close, or regulate fluid flow.

    control valves for boiler6
    control valves for boiler6

    d. According to the Closure Member’s Movement

    In this type, the flow of the fluid is modified by the closure member in rotary motion. Rotary motion valves are of three types.

    • Ball Type – As the name suggests, the shape of the valve is like a ball with a container for fluid flow. Right at the opening, this valve enables the flow and after being rotating at 90° it stops the flow. Ball valve has good resistance towards high temperature & high pressure. The advantage of the ball valve is easy to maintain and has low torque. On the other hand, it also has the disadvantage of causing corrosion when the fluid gets trapped inside the valve mainly during a closed position.
    reduced trim full ball valve
    reduced trim full ball valve
    • Butterfly Type – Butterfly valve has a disc rotating at 90˚ inside the pipe. The disc allows the stem to pass through it and is supported by both ends. Similar to the ball valve, the butterfly valve also stops with a right-angle rotation. The butterfly valve has the capacity of controlling large flow and low-pressure applications. It is affordable and has a quick opening. 
    high performace butterfly valve manufacturer in china1
    high performance butterfly valve manufacturer in china1
    • Plug Type – The plug valve is available in both cylindrical and tapered shapes. At the time of opening of this valve, both inlet and outlet ends of this valve, are connected to give a flow line. This valve is suitable for both chemical and petrochemical industries. The plug valve has advantages like less maintenance, fewer requirements of headroom, and quick opens. It has a low-pressure drop and doesn’t provide loose shut-off like a butterfly valve. The plug valve also has disadvantages like not affordable and is not useful for throttling action.

    eccentric plug valve5

    • Gate Type –In high temperatures, the gate valve is used for on/off applications. This is also recommended for non-throttling services because of its fully closed or fully open designs. It has a sliding gate to control the flow. It works well at the time of straight-line flow of liquid with minimum restrictions. Based on shape, the gate valve is further divided into two categories: Parallel and wedge.
      The gate valve starts working when the stem is rotated either clockwise to close motion or clockwise to open motion. As you move the stem, the gate valve moves up and down. The advantage of a gate valve is it comes with a tight sealing. Gate valve also has the disadvantage of requiring more actuating force.
    • Globe Type – Due to the globular shape, this valve is named a globe valve. Its closure member is a plug with a button, located right at the center. When the plug is raised, the globe valve allows the fluid flow. Globe valve mainly has 3 body designs as Z, Y, and angle body. The advantage of the globe valve is it has better throttling characteristics than other valves. It also has the disadvantage of having a high-pressure drop.
    • Diaphragm Valve –The diaphragm valve has a compressor that is connected to a flexing diaphragm. This diaphragm is lifted at the time of opening of this valve and allows the fluid flow. When the valve is closed, it closes the path tightly. The diaphragm valve works at low temperature and low pressure and is highly suitable for corrosive liquids. The advantage of the diaphragm valve is it is easy to maintain and has a simple construction. It also has disadvantages like it can’t be used in high temperatures and high pressure.
    • Pinch valve – A pinch valve is more cost-effective than other valves. This valve is used for slurries or liquids having minimal solid particles. It is similar to a diaphragm valve but uses flexible elements like rubber to turn off the fluid flow. To actuate the pinch valve, hydraulic pressure is placed on the elastomer sleeve. The pinch valve doesn’t have any internal obstructions and hence it has a low-pressure drop. This is a good advantage of the pinch valve.

    What is terminology or symbols in Control System in the Process Automation?

    control valves for process automation

    Normally the industrial process is by open-loop control or closed-loop control to maintain the desired data such as flow capacity, pressure, or temperature.

    Open-Loop and Closed-Loop Control Systems

    Generally, the open-loop control system that controls action only depends on the input signal without its output response.

    The closed-loop control system that controls action depends on both of input signal and a feedback signal from the valve controllers. 

    open loop control system
    open loop control system

    Operator controls the process variable p2 via remote adjuster 

    closed loop control system
    closed loop control system

     Operator controls the process variable p2 an a closed-loop

    Controlling system: Controller and actuator

    Controlled system: Final control element, pump, pipeline, heating system, etc.

    Input signal: It is the signal from the control room/operator controls to the valve positioner.

    Output signal: It is the signal from the valve positioner then feedback to the control system.

    Pneumatic globe type control valves: Globe valve, actuator, valve positioner, air filter regulator.

    Actuator: It is the device to provides the power to activate the valves.

    Steam Control Valves with Pneumatic Actuators

    pneumatic control valves

    Steam control valves with pneumatic actuators are widely used for industrial processes, such as sugar mills, power plants, chemical industry, oil, and gas.

    Usually, it is assembled with E/P or P/P valve positioner to receive an input signal from the controller room, 4-20mA or 3-15psi.

    pneumatic globe type control valves thintkank

    Description

    The multi-spring membrane pneumatic actuators of P/R type are applied for control operation of control valves and other positioning elements in automatic industrial systems. There are two following design options of the actuator:
    – Direct action (air – advances the stem)
    – Reverse action (air – retracts the stem)

    Features

    • Completely reversible action, option to change spring range w/o extra parts.
    • Strong structure of cast yoke.
    • Wide range of the available forces.
    • A linear relationship between rod displacement and control pressure as a result of using membranes with constant active area.
    • Various ranges of spring pressures due to the changeability of spring number and /or dislocation of distance fencers.
    • The capability of the actuator to incorporate side-mounted handwheel, pneumatic or electro-pneumatic positioners, limit switches, air sets, three-way pneumatic solenoid valves, lockup valves, position transducers.
    • The high strength of diaphragms, springs, and packings.
    • Compact size and lightweight.
    multi spring diaphragm actuator
    multi-spring diaphragm actuator

    ( a) Direct-acting( PZMA)
    1. Up diaphragm castings 2. Diaphragm
    3. Diaphragm plate 4. Spring
    5. Down diaphragm castings 6. Actuator stem
    7. Yoke 8. Adjust nut 9. Travel indicator

    multi spring diaphragm actuator 2
    multi-spring diaphragm actuator 2

    ( b) Reverse-acting ( PZMB)
    1. Up diaphragm castings 2. Diaphragm
    3. Diaphragm plate 4. Spring
    5. Down diaphragm castings 6. Actuator stem
    7. Yoke 8. Adjust nut 9. Travel indicator

    Model TT-667 actuator is a reverse-acting, spring-opposed diaphragm actuator. The actuator positions the valve plug in response to varying pneumatic loading pressure on the actuator diaphragm.

    Description
    Our Model TT-667 diaphragm actuator with a single spring is 100% to replace Fisher 667 actuators, which are designed to ensure stable on/off or throttling operation of the control valve. These spring-balanced membrane actuators respond to the pneumatic output signal of the controller or valve positioner to determine the position of the valve plug. 667 diaphragm actuator is a reverse-acting.

    Specifications:

    • Acting type: spring return, linear
    • Control type: on/off, throttling
    • Working temperature: low temperature, standard temperature, high temperature
    • Power supply: pneumatic, manual
    • Valve type: angle, globe
    • Sizes for 667 models: 667-30, 667-34, 667-40, 667-45, 667-46, 667-50, 667-60, 667-70
    • The diaphragm size of the actuator: 30, 34-40, 45-50, 46-60, 70
    fisher type control valves
    fisher type control valves

    It could be a single-seated, double-seated, cage-guided, top-guided globe type trim design for the industrial engineering process. The control valve body assembly with a pneumatic actuator to modulate or shut off downstream pressure, flow rate, or temperature.

    control valves for boiler7
    control valves for boiler7

    Three ways control valves are service for diverting or mixing service. The pneumatic actuator is designed as a rubber diaphragm with multi-springs, or piston/cylinder type pneumatic actuator with single-acting or double-acting.

    the principle of action 3 way control valves direct action mixing type
    the principle of action 3 way control valves direct action mixing type
    three way control valve dynamic demonstration
    three way control valve dynamic demonstration

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