Three-Way Control Valve

Body type: Three-way cast globe valve with an S-streamlined flow passage
Trim type: Double-seat, cage-guided plug structure
Nominal diameter: DN25~450mm
Nominal pressure: PN16~PN100; ANSI Class 150~600
Flow characteristic: Linear
Rangeability: 50:1; 75:1 optional
Leakage class: Class IV; Class V optional; Class VI with soft seat
Actuator: Pneumatic diaphragm actuator, pneumatic piston actuator or electric actuator

Product Overview

The three-way control valve is used where the process requires either two fluid streams to be combined into one common outlet or one inlet stream to be divided into two outlet branches. In suitable piping arrangements, one three-way valve can replace two separate two-way valves and simplify the control loop.

The valve body uses an S-streamlined flow passage to provide relatively low pressure loss and high flow capacity. The internal trim uses a double-seat, cage-guided arrangement that supports stable plug movement, accurate positioning and convenient maintenance.

The valve can be supplied with a pneumatic diaphragm actuator, pneumatic piston actuator or electric actuator. The selected actuator action determines the valve position after loss of signal or air supply, so the required fail position must be confirmed during selection.

Working Principle

mcv 310 mixing type valve structure — **Mixing Principle**

mcv 310 diverting type valve structure — **Diverting Principle**

Mixing service: Fluid enters through ports A and B and leaves through the common port AB. By changing the plug position, the valve changes the contribution of each inlet stream to the combined outlet flow.

Diverting service: Fluid enters through the common port AB and is distributed toward port A or port B. By changing the plug position, the valve changes how much flow is directed into each outlet branch.

Basic Technical Parameters

Item	Specification
Valve Function	Mixing or diverting
Body Type	Three-way cast globe valve with S-streamlined flow passage
Trim Type	Double-seat, cage-guided plug structure
Nominal Diameter	DN25~450mm
Pressure Rating	PN16, PN25, PN40, PN63, PN100; ANSI Class 150, 300, 600
Flow Characteristic	Linear
Rangeability	50:1; 75:1 optional
Leakage Class	Class IV; Class V optional; Class VI with soft seat
Face-to-Face Standard	IEC 60534-3-1 and ASME B16.10
Actuator	Pneumatic diaphragm actuator, pneumatic piston actuator or electric actuator

Product Features

The three-way control valve is designed around a compact cast globe-valve body, an S-streamlined flow passage and a cage-guided double-seat trim. The structure is intended to provide stable throttling, high flow capacity and practical maintenance access for mixing and diverting service.

Product Features

S-streamlined flow passage: Helps reduce pressure loss while providing high flow capacity.
Three-way flow control: One valve can perform mixing or diverting duty in the required piping arrangement.
Double-seat, cage-guided trim: Provides strong plug guidance, stable movement and good regulating accuracy.
Modular internal parts: Different trim sizes and Cv values can be selected to match the process duty.
Bolted split bonnet: Supports maintenance access and different temperature configurations.
Direct seat retention: The cage compresses and locates the seat for practical assembly and disassembly.
Hard-seat construction: Suitable for broad industrial service and long operating life.
Pneumatic or electric actuation: The actuator package can be configured according to signal, thrust and fail-position requirements.

Bonnet Temperature Range

Bonnet Configuration	Applicable Temperature
Normal bonnet	-20℃ to +230℃
Extension bonnet	-40℃ to +350℃
Heat-dissipation bonnet	+350℃ to +566℃

Flow Characteristic

The valve uses a linear flow characteristic. As travel changes, the effective flow area changes in an approximately linear manner. In mixing or diverting service, the two controlled paths move in opposite directions so that one path opens while the other closes.

Flow Direction and Actuator Action

Valve Function	Flow Characteristic	Actuator Action	Zero-Signal Position	Controlled Flow Direction
Mixing	A→AB	Direct acting	Fig. 1.1	B→AB
Mixing	B→AB	Reverse acting	Fig. 1.2	A→AB
Diverting through a mixing-body arrangement	AB→A	Direct acting	Fig. 2.1	AB→B
Diverting through a mixing-body arrangement	AB→B	Reverse acting	Fig. 2.2	AB→A
Diverting	AB→B	Direct acting	Fig. 3.1	AB→A
Diverting	AB→A	Reverse acting	Fig. 3.2	AB→B

Optional Accessories

Positioner
Air filter regulator
Solenoid valve
Limit switch
Valve position transmitter
Lock-up valve
Pneumatic booster
Manual handwheel mechanism

Specification Parameters

Nominal Diameter, Seat Diameter, Rated Cv and Travel

Nominal Diameter (mm)		25			32			40			50			65
Seat Diameter (mm)		15	20	25	20	25	32	25	32	40	32	40	50	40	50	65
Rated Cv	Mixing Valve	4.0	6.3	10	6.3	10	16	10	16	24	16	24	40	24	40	64
Rated Cv	Diverting Valve	–			–			–			–			–
Rated Travel (mm)		16						25						40

Nominal Diameter (mm)		80			100			125			150			200
Seat Diameter (mm)		50	65	80	65	80	100	80	100	125	100	125	150	125	150	200
Rated Cv	Mixing Valve	40	64	100	64	100	160	100	160	250	160	250	400	250	400	640
Rated Cv	Diverting Valve	40	64	100	64	100	160	100	160	250	160	250	400	250	400	640
Rated Travel (mm)		40						60						75

Nominal Diameter (mm)		250			300			350			400			450
Seat Diameter (mm)		150	200	250	200	250	300	250	300	350	300	350	400	350	400	450
Rated Cv	Mixing Valve	400	640	1000	630	1000	1450	1000	1450	2000	1450	2000	2600	2000	2600	3300
Rated Cv	Diverting Valve	400	640	1000	630	1000	1450	1000	1450	2000	1450	2000	2600	2000	2600	3300
Rated Travel (mm)		100						130						150

Main Technical Parameters

Leakage Class	Class IV; Class V optional; Class VI with soft seat; GB/T 4213-2008; ASME B16.104-1998
Flow Characteristic	Linear
Rangeability	50:1; 75:1 optional
Pressure Rating	PN16, PN25, PN40, PN63, PN100; ANSI Class 150, 300, 600
Flange Standard	GB/T 9113-2000; HG/T 20592-2009; HG/T 20615-2009 (ASME B16.5-2009); JB/T 79-1994
Facing / End Connection	RF, MFM, RJ, SW and BW

Face-to-Face Dimensions (Unit: mm.)

Nominal Diameter (mm)		25	32	40	50	65	80	100	125
L	ANSI150RF.PN16	185	200	220	250	275	300	350	403
L	ANSI300RF.PN40	190	210	230	255	285	310	355	425
E	ANSI150RF.PN16	140	150	160	180	200	220	235	256
E	ANSI300RF.PN40	150	160	170	190	220	232	256	295

Nominal Diameter (mm)		150	200	250	300	350	400	450	500
L	ANSI150RF.PN16	450	550	670	770	890	1020	1180	1360
L	ANSI300RF.PN40	460	560	740	805	930	1060	1240	1420
E	ANSI150RF.PN16	278	322	380	460	570	710	880	1080
E	ANSI300RF.PN40	313	372	450	540	660	820	1000	1220

Actuator and Valve Outline Dimensions

Nominal Diameter (mm)	Actuator Model	H		B
Nominal Diameter (mm)	Actuator Model	Normal Type	Heat-Dissipation Type	B
25	M812	447	587	267
32	M812	482	632	267
40	M812	537	697	267
50	M812	540	710	267
65	M813	677	857	350
80	M813	705	895	350
100	M813	722	922	350
125	M814	887	1117	470
150	M814	887	1117	470
200	M814	1022	1282	470
250	M815	1235	1515	580
300	M815	1260	1560	580
350	M826	1350	1670	620
400	M826	1450	1800	620
450	M827	1580	1940	680

The numerical values above are reproduced from the supplied selection-manual pages. Final sizing, seat diameter, actuator selection and allowable differential pressure should be checked against the actual process conditions.

Specification Applications

The three-way control valve is selected where the process requires controlled mixing, controlled diversion or bypass regulation. Its function is determined by the piping arrangement, internal flow path, actuator action and required position after signal or air failure.

Typical Mixing Applications

Combining two inlet streams into one common outlet.
Mixing hot and cold fluids for temperature control.
Blending two compatible process or utility streams.
Controlling the proportion of direct flow and recirculation flow.
Temperature-control loops in heat-exchanger and circulation systems.

Typical Diverting Applications

Dividing one inlet stream into two outlet branches.
Bypass control around heat exchangers, filters or other process equipment.
Routing flow between two downstream lines or items of equipment.
Modulating distribution where simple on/off switching is not sufficient.
Controlling process flow between a main line and a return line.

Applicable Process Media

Industrial water and compatible liquids.
Gas service within the confirmed pressure, temperature and material limits.
Steam service with the appropriate bonnet, trim, pressure class and actuator selection.
Heating and cooling media used in industrial temperature-control systems.

Selection Information Required

Required function: mixing or diverting.
Minimum, normal and maximum flow.
Inlet and outlet pressure for each operating case.
Operating and design temperature.
Medium name, density and process characteristics.
Required nominal size, pressure class and connection standard.
Required Cv or complete sizing data.
Body and trim material requirements.
Required leakage class.
Pneumatic or electric actuator requirement.
Control signal, air-supply pressure or electric power supply.
Required valve position after loss of signal or air supply.
Accessory, explosion-protection and documentation requirements.

Selection Notes

The nominal line size alone is not sufficient to confirm the valve. The selected seat diameter, Cv, travel, actuator thrust and allowable differential pressure must match the actual operating cases. For high-temperature, high-pressure-drop, flashing, cavitation, noisy or particle-containing service, the valve construction and trim should be reviewed separately.

Three-Way Control Valve

Product Overview

Working Principle

Basic Technical Parameters

Product Features

Product Features

Bonnet Temperature Range

Flow Characteristic

Flow Direction and Actuator Action

Optional Accessories

Specification Parameters

Nominal Diameter, Seat Diameter, Rated Cv and Travel

Main Technical Parameters

Face-to-Face Dimensions (Unit: mm.)

Actuator and Valve Outline Dimensions

Specification Applications

Typical Mixing Applications

Typical Diverting Applications

Applicable Process Media

Selection Information Required

Selection Notes

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Features

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