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    What is a Globe 3 Way Control Valves?

    The three-way control valve is a kind of cage-guided globe valve, which has three pipeline connections. THINKTANK produces HMD series(flow mixing type) and HTD series(flow diverting type) for industrial heavy-duty converging or diverting applications. It is designed for balanced and unbalanced trim with throttling or on/off function. Standard 3-way globe control valves are assembly with a pneumatic/piston diaphragm actuator or electric actuator, valve positioner, and air filter regulator for precise flow throttling service.

    three way control valve dynamic demonstration
    (a) 3-Way Diverting Type Control Valve
    (b) 3-Way Mixting Type Control Valve

    How do three ways control valves work?

    The three-way globe control valve has three flow ports, one inlet port & two outlet ports called diverting type, two inlet ports & one outlet port called mixing type. The mixing type 3-way control valve is used to combine two fluids into a third fluid, or two same liquids at different temperatures are mixed into a fluid of the same temperature. The diverting type 3-way control valve divides a fluid into two fluids.

    three way control valve dynamic demonstration
    (a) 3-Way Diverting Type Control Valve
    (b) 3-Way Mixting Type Control Valve

    According to different actuators, three-way control valves include three types: electric three-way control valve, pneumatic three-way control valve, and manual three-way control valve. Based on the structure of the valve trim, it includes two types: three-way diverting type control valve and three-way mixing type control valve.

    Model HMT and HDT series are the three ways control valves in THINKTANK. The valve model HMT is a three-way control valve for mixing service.
    The actuator employed is a multi-spring type with a small-sized, high-output diaphragm motor with a highly simplified operating mechanism. It is used for the heat control of heat converters, etc.
    The valve model HDT is a three-way control valve for diverting service.

    It has a small-sized, high-output diaphragm motor suitable for big port and high differential pressure services. 

    hmt standard type 3-way control valve
    HMT Series
    hdt standard type 3-way control valve
    HDT Series

    1. Connect Pipe 2. Double-screw Bolt
    3. Hexagon Nut 4. Sealing
    5. Gasket 6. Lower Bonnet
    7. Body 8. Plug
    9. Upper Seat 10. Stem
    11. Bonnet 12. Packing Spring
    13&14. Nuts&Bolts 15. Spring Plate
    16&17. Studs&Nuts 18. Locknut
    19. Stem Connector 20. Actuator

    Trim

    Valve plug

    Three-way, V-port with linear characteristics

    Actuator

    Type

    Single-acting diaphragm actuator, Spring type piston
    actuator, Double acting piston actuator

    Diaphragm material

    Cloth embedded nylon and ethylene propylene rubber

    Spring range

    • 20 to 100 kPa(0.2 to 1.0 kgf/cm2)
    • 40 to 200 kPa(0.4 to 2.0 kgf/cm2)
    • 80 to 240 kPa(0.8 to 2.4 kgf/cm2)

    Supply pressure

    0.14, 0.25, 0.28, 0.4, 0.5 Mpa

    Air connection

    Rc1/4 or 1/4NPT internal thread

    Ambient temperature

    -30 to 70℃

    Valve action

    • FO: Air to close(Direct action actuator is combined.)
    • FC: Air to open(Reverse action actuator is combined.)

    Optional accessories

    • P/P or I/P Positioner
    • Air filter regulator
    • Top-mounted or Side-mounted Handwheel
    • Limit switch
    • Solenoid valve
    • Motion transmitter
    • Booster relay
    • Lock-up valve
    • Airlock relay
    • Others

    Performance

    Rated Kv value

    Refer to table 1.

    Flow characteristics (Refer to table 2)

    • Linear

    Leakage

    • Metal Seat
    According to IEC 60534-4:2006 Class IV, leakage less
    than 0.01% of maximum valve capacity.

    Inherent rangeability

    • 30:1

    Hysteresis error

    • Without positioner: Within 3% F.S.
    • With positioner: Within 1% F.S.

    Linearity

    • Without positioner: Within ±5% F.S.
    • With positioner: Within ±1% F.S.

    extension bonnet for 3-way control valves

    Figure 2-1 Extension Bonnet
    Suitable medium temperature range of -60 to -29
    or over 200
    1. Extension Bonnet 2. Packing
    3. Inspection(custom) 4. Bushing

    bellows seal for 3-way control valves

    Figure 2-2 Bellows Seal
    Bellows seal bonnets are used when no leakage(less than
    1×10-6 cc/sec of helium) along the stem can be tolerated.
    They are often used when the process fluid is toxic,
    volatile, radioactive, or highly expensive. This special
    bonnet construction protects both the stem and the valve
    packing from contact with the process fluid.
    1. Lower Bonnet 2. Bellows
    3. Inspection(custom) 4. Upper Bonnet

    Table 1. Rated Kv Value and Travel

    Nominal Diameter
    DN(mm) 
    Port SizeRated Kv
    Value
    Travel(mm)
    Linear
    20205.316
    25205.316
    258.516
    32205.316
    258.516
    321325
    40258.516
    321325
    402125
    50321325
    402125
    503425
    65402125
    503425
    655340
    80503425
    655340
    808540
    100655340
    808540
    10013540
    Nominal Diameter
    DN(mm) 
    Port SizeRated Kv
    Value
    Travel(mm)
    Linear
    125808540
    10013540
    12521060
    15010013540
    12521060
    15034060
    20012521060
    15034060
    20053560
    25015034060
    20053560
    250800100
    30020053560
    250800100
    3001280100
    350250800100
    3001280100
    3501600100

    Table 2. Flow Characteristics

    table 2. flow characteristics

    R30 Unit: %

    r30

    The Principle of Action 3-way Control Valves

    the principle of action 3 way control valves direct action mixing type
    the principle of action 3 way control valves direct action mixing type
    3-Way Mixing Type Control Valve Flow Diagram
    the principle of action 3 way control valves direct action diverting type
    the principle of action 3 way control valves direct action diverting type
    3-Way DivertingType Control Valve Flow Diagram

    Description:
    The plug structure of the three-way control valve is designed to flow to the open. If valve plug in the valve seat that is mixing service control valve. There are two input ports and one outlet port(see Figure a, b). The valve plug is located on the outside of the valve seat that is diverting the service control valve. There is one inlet port and two outlet ports (see Figure c, d).

    Due to the three-way control valve have opening and closing operation at the same time, so three-way control valve doesn’t have air to open or air to close such type.
    • For Direct Action Mixing Service, air failure means vertical pass(B → AB). But for Reverse Action Mixing Service, air failure means the flow is a horizontal pass (A → AB)
    • For Direct Action Diverting Service, air failure means horizontal pass (AB → A). But for Reverse Action Diverting Service, air failure means the flow is a vertical pass(AB → B)

    The Drawing/Dimension of Pneumatic Diaphragm 3-Way Control Valves

    the drawing dimension of 3 way control valves
    the drawing dimension of 3 way control valves2

    The Drawing/Dimension of Pneumatic Piston/Cylinder 3-Way Control Valves

    external dimensions for double acting piston type actuator
    external dimensions for double acting piston type actuator2

    Mixing Service by HMT 3-Way Control Valve Symbol

    mixing service by hmt

    Mixing Service by HDT 3-Way Control Valve Symbol

    diverting service by hdt

    Globe 3-Way Control Valve Manufacuturer
    For Water, Oil, or Steam System pdf

    THINKTANK is one of the well-known control valve manufacturers in China, which focus on control systems for over 10 years. If you are interested in the price of 3-way control valves, just feel free to contact us. <[email protected]>

    3 ways control valves catalog pdf
    Three-Way Control Valves Manual

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