Tomoe 304YA, Instruction Manual

Page: 9 / 29

8
3. 3 Installation and Working Environment
(Continued)
3. 3. 5 Removal and replacement of this product and the actuator
1) The seat sealing performance of this product depends on the full-close adjustment mechanism
of the actuator. Therefore, make alignment marks before removing the actuator, and take care
that its position is not changed at reassembly.
2) Do not remove the actuator and replace it with other actuators or modify the actuator. When
the actuator is replaced or modified, the warranty is no longer applicable.
CAUTION
3. 3. 6 Precautions for installation of thermal insulating material for the valve
If a thermal insulation thickness is 50 mm or less from the pipe outer diameter and the flange outer
diameter, the gland can be retightened. Leakage of fluid from this product to the outside may hap-
pen due to reduction in the tightening force as a result of stress relaxation of the packing during
commissioning and operation. In consideration of leakage, install the thermal insulation so that the
lever and the handle can be operated unhindered.
In addition, install the thermal insulation so that the indication of opening can be seen. For a gear
actuator, there is an option to extend the indication of opening. Please contact our sales.
CAUTION
3. 3. 7 Condensation
Condensation may occur in the actuator when the temperature of the actuator is different from the
ambient temperature.
There is an option to prevent condensation of the actuator. Please contact our sales.
CAUTION
3. 3. 8 Precautions for selection
1) This product has a structure where the body gets wet in contact with the fluid. Pay attention to
corrosion of the body due to the fluid used. Especially, Be careful to FCD450.
2) A pressure direction (flow direction) is specified on the body. Use with pressurization in the op-
posite direction is not guaranteed.
3) The pressure test is performed with water at the factory. When the fluid is gas/vapor and a little
external leakage is a problem, please contact our sales department.
4) This product use RPTFE for seat ring, so it is very weak for rust or jam and easy to get injured.
If get injured, happen leak at during an early stage.
5) If used fluid be powder or slurry, it is piled up on stopper or seal surface for disc. And lifetime
for product might be shorter.
50
50
50
Thermal
insulation
Outside diameter of
the flange
Thermal
insulation
Valve body
[Fig.-5]