Yoshitake CF-90 type is a constant flow valve used in the water supply lines of apartment buildings and medium-high rise buildings for cold and hot water up to 90°C. The orifice opening is adjusted to keep the flow rate constant in response to pressure fluctuations on the primary side. The product conforms to the standards of the Japanese Water Supply Act and features NPb-treated bronze construction.

Specifications

INFO

Please confirm that the indications on the product correspond with the specifications of the ordered model before use. If they are different, do not use the product.

Model	CF-90
Nominal size	15A - 25A
Application	Cold and hot water
Max. pressure	1.0 MPa
Working differential pressure range	0.2 - 0.7 MPa
Application temperature	5 - 90°C
Set flow rate	1 L/min - 40 L/min
Tolerance of set flow rate	(15A, 25A) Within ±20% of set flow rate (20A) Within ±3 L/min of set flow rate
Connection	JIS Rc screwed
Installation posture	Horizontal or vertical installation

Set Flow Rate List

Nominal size	Set flow rate (L/min)
15A	1, 2, 3, 4, 5, 6, 7
20A	8, 10, 12, 14
25A	20, 25, 30, 35, 40

Structure, Dimensions and Weight

Nominal size	d	L (mm)	A (mm)	Weight (kg)
15A	Rc 1/2	46.5	26	0.2
20A	Rc 3/4	60	32	0.3
25A	Rc 1	70	41	0.5

Internal Structures

15A

Internal structure of B (20A)

Internal structure of B (25A)

No.	Parts name
1	Body
2	C type retaining rings (internal)
3	Cartridge
4	Label
5	JWWA label
*6	Spacer (only for 20A)
*7	Needle (only for 25A)
*8	Needle plate (only for 25A)

Performance Characteristics

Noise Characteristic Chart(The chart shows the noise level at the max. flow rate of each nominal size.)

Flow Rate Characteristic Chart

Precautions for Installation

WARNING

• Before installing the product, remove foreign substances and scale from the piping, and note that seal materials must not flow into the inside of the product or piping.
• The product can be installed either horizontally or vertically. To install the product, check the direction on the label of the product so that the fluid flowing and the mark on the product are in the same direction. Wrong direction leads to malfunction.
• Install pipes so that excessive load, torque or vibration is not applied to the product.
• If component having negative effect on inner parts is included in fluid and environment, deterioration of rubber parts is accelerated and causes outside leakage and functional disorder.
• Impact by rapid pressure change, such as water hammer, breaks the product or parts.
• If fluid cannot flow due to closed piping situation of the product, fluid temperature rise expands volume of fluid in the piping and damages the product.
• Do not make dissimilar metal piping which causes difference of electrical potential.
• The products cannot be used with pipe end core.

TIP

• Install a strainer (mesh size of 60 or 80) at the inlet side of the product. The majority of product failures are happened due to scales such as sands and dust in the pipeline.
• Be sure to install bypass piping. The noise level is greatly affected by the condition of the piping system and indoor environment. To balance the total flow rate, use a bypass pipe to reduce the flow velocity or make other adjustments.
• Secure enough space needed for maintenance and inspection of the product.

Precautions for Operation

Warning

• Before leading fluid, make sure that there is no danger when the fluid flows to the end of piping. Hot fluid may spout out and result in burns.
• Do not touch the product with bare hands when the product is used for hot fluid.

Caution

• Close the stop valves before and after the valve, and remove all foreign matter and scales via the by-pass line before operation.
• In case of a possible frozen line, take proper measures to remove water inside the piping or equip the product with insulating materials.
• Completely discharge the fluid inside of the product and line before leaving the product not operated for a long time to avoid rust.

Troubleshooting

Trouble	Cause	Remedy
No flow or Poor flow	The cartridge is clogged.	Clean the cartridge.
	The cartridge is broken.	Replace the product.
	The set flow rate is wrong.	Confirm the flow rate with the indications on the product.
	Stop valves before and after the product are not completely opened.	Open completely the stop valves.
	It is frozen.	Check the piping.
	The differential pressure is out of the specified range.	Review usage conditions.
Flow rate more than specified	The cartridge is broken. The rubber part of the cartridge is hardened.	Replace the product.
	The set flow rate is wrong.	Confirm the flow rate with the indications on the product.
	The differential pressure is out of the specified range.	Review usage conditions.
Steam leakage	Parts or body is damaged or deformed.	Replace the product.
	Installation on piping is loose.	Please retighten.