The Yoshitake MXV-1 mixing valve is a temperature regulating valve that mixes hot water and cold water to make water of a desired temperature. The valve is controlled by the expansion and compression of a wax thermoelement to provide mixed water of a stable temperature. This product features built-in check valves in the inlet connection parts, allowing for compact piping and saving on component amounts.

Features

1. Set temperature range is 38 to 65°C, making it applicable for wide usage.
2. Check valves are incorporated in inlet connection parts so that piping can become compact and components amount can be saved.
3. Applicable for circulation piping by using the attached circulating water inlet joint.

Specifications

Specification	Value
Model	MXV-1
Nominal size	25-50A
Application	Cold and hot water
Working pressure	1.0 MPa or less
Minimum closing pressure of check valve	3 kPa
Supply pressure difference (cold/hot)	Within 0.05 MPa
Set temperature range	38-65°C
Initial set temperature	48°C
Working temperature	90°C or below (no freeze condition)
Temp. difference (cold water to set)	10°C or more
Temp. difference (hot water to set)	10°C or more
Installation posture	Vertical or horizontal installation
Connection	JIS Rc screwed
Connection for circulating water inlet	JIS G 1/2 screwed

Materials:

• Body: Brass
• Union joint: CAC
• Union packing: FKM

Package Content

Please confirm that the package includes the following parts:

• Mixing Valve Body
• Insulating case
• Hexagon wrench (1 piece)
• Circulating water inlet joint

Dimensions and Weights

Nominal size	d	L	L1	H	H1	A	A1	Weight (kg)
25A	Rc 1	192	110	145	98	39	54	2.3
32A	Rc 1-1/4	225	130	172	114	49	66	4.0
40A	Rc 1-1/2	256	150	189	128	56	73	5.4
50A	Rc 2	292	180	221	144	69	90	9.4

Flow Characteristics

This chart shows the flow characteristics obtained when the supply pressures of hot water and cold water are the same (If these pressures are different, regard pressure difference between the lower one and the mixed water as the pressure loss). The values which this chart shows include pressure loss due to check valves.

Piping Examples

1. Standard Piping Example

2. Piping Example for Hot Water System

3. Piping Example for Circulation Piping

Installation Precautions

WARNING

1. When installing the product, make sure that each connection (for hot water, cold water, and mixed water) is connected to the piping properly, and that two union joints with check valves and one union joint are properly connected to the body. Failure to follow this notice may prevent the product from functioning properly resulting in scalds due to hot water.
2. Since the product cannot stop water completely, when cold water is not supplied to the product due to water cutoff or any other reasons, only hot water comes out of the mixed water outlet without being cooled. Please take measures against such temperature rise.

CAUTION

• Before installing the product, remove foreign substances and scale from the piping. Be sure to install a strainer in the piping.
• Do not apply excessive load, torque or vibration to the product.
• The temperature of mixed water can change due to pressure fluctuation of hot water and/or cold water or hot water temperature change. Make sure to install a mixing faucet right before a hot water supply inlet for easy temperature control.
• Be sure to install thermometers and pressure gauges in piping.
• A large pressure difference between hot water and cold water makes temperature control of mixed water unstable. Keep the pressure difference within 0.05 MPa, for example, by installing a pressure reducing valve for each inlet.
• After installing the product, use the case made of polystyrene foam (fire-retarding material) as the insulating case for the product.

How to Adjust Set Temperature

Set temperature is adjusted to 48°C when shipped out from the factory. To change set temperature, turn the adjusting screw. Set temperature range is from 38°C to 65°C.

To change set pressure, use the hexagon wrench (supplied with the product) and another wrench (commercially available) to turn the adjusting screw. The hexagon wrench is placed on the surface of the insulating case.

1. Loosen the lock screw by using the hexagon wrench.
2. Slowly turn the adjusting screw by using a wrench to achieve the desired temperature while checking the thermometer set at the mixed water outlet. Turn the adjusting screw counterclockwise to raise set temperature, or clockwise to lower set temperature.
3. After adjustment, tighten the lock screw.

Troubleshooting

Trouble	Cause	Remedy
Desired temperature of mixed water cannot be obtained	1. Cold water or hot water is not supplied. 2. Pressure difference between cold water and hot water is more than 0.05 MPa. 3. Temperature difference between set temperature and temperature of hot water (or of cold water) is less than 10°C. 4. Foreign substance is stuck inside of the product. 5. It is right after set temperature has been changed. 6. The body and joints are not properly connected.	1. Supply both cold water and hot water. 2. The supply pressure difference should be within 0.05 MPa. 3. Make the hot water temperature at least 10°C higher than set temperature, and cold water at least 10°C lower. 4. Replace the product with a new one. 5. Adjust the temperature by slowly turning the adjusting screw with checking the thermometer. 6. Check if all the parts are connected properly.
Mixed water temperature fluctuates	1. Supply temperature and/or pressure of cold water and/or hot water fluctuate. 2. Pressure difference is more than 0.05 MPa. 3. Foreign substance is stuck inside. 4. Flow rate has changed rapidly or greatly. 5. It is right after set temperature has been adjusted.	1. Supply cold water and hot water stable both in temperature and pressure. 2. Keep pressure difference within 0.05 MPa. 3. Replace the product. 4. It may take time for the product to supply mixed water of stable temperature. 5. Adjust slowly while checking the thermometer.
Mixed water does not flow out	1. The body and joints are not properly connected. 2. Cold water and/or hot water is not supplied.	1. Check connections. 2. Supply both cold water and hot water.
Outside leakage	1. Union nut is loosened. 2. Union packing is deteriorated.	1. Fasten the union nut. 2. Replace the union packing with a new one.

Parts and Materials

No	Name of Parts	Material
1	Body	Brass
2	Union Joint for Check Valve	Bronze (CAC406C or CAC406)
3	Check Valve	PPO/EPDM
4	Union Joint	Bronze (CAC406C)
5	Gasket (Union packing)	FKM
8	Union Nipple	Brass