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EPDT-023c
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5.2
Precautions before Operation
Caution
(1)
Depending on the water quality, brass parts may corrode or be promoted, causing product
malfunction. In an environment where corrosion may occur, select a product made of a
compatible material such as stainless steel.
(2)
If components having negative influence on internal parts are included in fluid or
surroundings, deterioration of rubber parts is accelerated and then outside leakage or
functional disorder is caused.
(3)
The product or parts will be damaged if an impact due to sudden pressure fluctuations
such as water hammer is applied.
(4) If the product is in a closed pipe state, the fluid in the pipe will expand in volume due to
the rise in fluid temperature, and the product will be damaged.
(5) Sticky fluids can cause parts to stick together and cause malfunction.
(6)
Since it is weight thing, this product should use lifting equipment etc., and please support
a product certainly and install it in piping.
* There is a possibility that it may be injured, by fall of product.
(7)
Do not disassemble the product unless it is necessary.
* Unnecessary disassembly prevents the product from functioning properly.
(8)
Install a by-pass pipe.
* If a bypass pipe is not installed, system operation will need to be stopped in the event of
product failure.
(9)
Before installing the product in the piping, be sure to remove foreign substances and scale
from the piping. Keep foreign substances from entering the piping, including seal tape or
liquid seal agent for piping connection.
* Ingress of foreign substances, scale or seal agent into the product leads to valve leakage
or malfunction of the product.
(10)
Be sure to install a strainer at the inlet side of the product.
* Ingress of foreign substances or scale into the product leads to malfunction of the
product. It is recommended to use a strainer of 60 mesh or more.
(11)
Be sure to install pressure gauges at the inlet and outlet sides of the product.
* Failure to follow this notice hampers correct pressure adjustment.
(12)
Install pipes so that excessive load, torque or vibration is not applied to the product.
* Doing so may result in malfunction or drastically shortened service life.
(13)
For gas application, install a trap to the inlet sides of the valve to prevent drainage problem.
* Failure to do so may result in drainage problem, affecting the original performance.
(14) Do not use dissimilar metal piping that causes a potential difference.
* Products and parts will corrode.
(15) Install the product properly by checking the inlet, outlet and proper posture. The product
can be installed either horizontally or vertically (nominal size 15A to 80A). In the case of
the nominal size 100A to 150A, install the product horizontally.
* Installing the product in wrong directions prevents the product from functioning properly.
(16) When releasing water into an open tank, the secondary piping should be raised
approximately 1m from the product and an air vent valve should be installed. Additionally,
extend the piping as deep into the water as possible (see Fig. 10,11).
* Doing so may result in malfunction or drastically shortened service life.
(17) To maintain easily, install a drainpipe between stop valve and primary pressure regulating
valve.
(18) Above the center of the pipe line, be sure to reserve space larger than H
2
(Fig.12). Please
see the Table 10.
(19) Before performing the water pressure test, close the stop valves upstream and
downstream of the product.
*The test pressure may damage the product.
