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(1)
Blowout operation
As inlet pressure approaches the blowout pressure, the force of fluid pushing up the valve [5]
approaches the force of the spring [9] pressing down the valve. The safety valve commences to
blow when the inlet pressure reaches around 3% below the blowout pressure.
The fluid starts to leak by simmering and accumulates gradually on the valve holder
fluid pressure reaches the blowout pressure the valve pops.
(2) Closing operation
Since the inlet pressure of the safety valve decreases when the fluid is released into the
atmosphere by the pop action of the valve [5], the force of fluid lift is lowered. At this point, the
repelling force of the spring [9] becomes larger than the force of fluid lift and thus the valve closes.
In addition, since the safety valve blows, the pressure of fluid entering into the back of the valve
holder (back pressure) adds to the closing force.
(3) Lift lever mechanism
1. Do not touch the product/pipes or the lever [14] with bare hands.
* Failure to follow this notice may result in scalds or injury in case that fluid is hot.
2. When checking the operation of the product, wear earplugs and stand clear of exhaust pipe end
during inspection. Do not look down or touch the open end of the exhaust pipe.
* Failure to follow this notice may result in scalds or injury due to blow-off. Be aware that the
product makes a loud noise at start-up.
3. Fluid is discharged from outlet and partly from the other parts.
Due to lift lever mechanism a discharge inspection can be manually performed at more than 75%
of the blowout pressure.
5.1 Pre-warning and precaution for use
1. Do not install any closing device such as a stop valve at inlet and outlet sides of the product.
2. Install an exhaust pipe on outlet side of the product, and lead it to a place where there is no risk of
physical damage even if fluid blows out.
* Failure to follow this notice may result in injury and scalds in case of fluid blow out.
3. Do not disassemble the product.
* Failure to follow this notice may prevent the product from functioning properly and lead to
danger.
4. When installing the product, securely wrapped around the seal tape to the
threaded portion, please tighten by applying a spanner to the hexagonal portion
of the valve seat [1]. (Please never tighten against a pipe wrench or other tools on the spring
chamber [2]).
* It is dangerous because using fluid is blown out by cracking and loosening of the thread portion.
5. Regarding applicable fluid, viscous fluid that may make fixation of the valve and valve seat cannot
be used.
* Failure to follow this notice may make valve and valve seat fixed and prevent the product from
functioning properly.
6. Fluid is discharged from outlet and partly from the other parts.
7. If the product is not operated for a long time, perform test working before starting operation.
4．Operation
Warning
5．Maintenance and inspection
Warning
-3-
. When the
○ A
■EPDT-072ｊ■
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