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.
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.
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.
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
Three-way, V-port with linear characteristics
Single-acting diaphragm actuator, Spring type piston
actuator, Double acting piston actuator
Cloth embedded nylon and ethylene propylene rubber
• 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)
0.14, 0.25, 0.28, 0.4, 0.5 Mpa
Rc1/4 or 1/4NPT internal thread
-30 to 70℃
• FO: Air to close(Direct action actuator is combined.)
• FC: Air to open(Reverse action actuator is combined.)
• 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
Refer to table 1.
• Metal Seat
According to IEC 60534-4:2006 Class IV, leakage less
than 0.01% of maximum valve capacity.
• Without positioner: Within 3% F.S.
• With positioner: Within 1% F.S.
• Without positioner: Within ±5% F.S.
• With positioner: Within ±1% F.S.
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
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
|Port Size||Rated Kv|
|Port Size||Rated Kv|
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)
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]>
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