HS11X-16T Wire Mouth Backflow Preventer
Product overview
Product model: HS11X-16T
Nominal diameter: DN40~100mm
Nominal pressure: PN1.0~1.6MPa
Applicable temperature: 0~80℃ (up to 200℃ if necessary)
Flange standard: GB/T17241.6, GB/T9113
Test standard: GB/T 13927, API598
HS11X-16T Wire Mouth Backflow Preventer product description:
HS11X-16T silk mouth backflow preventer is to repair the pipeline and
power, the tap water is often interrupted, once the power supply is
restored, tap water becomes yellow and dirty, it is due to the process
of water, from the fire pipe , Unoccupied buildings or water pipes have
not yet used the branch of the backwater, rust water back. In order to
allow residents to drink clean water, backflow preventer this device can
effectively prevent the occurrence of dirty water in the above
circumstances, not only ensure the safety of residents drinking water,
but also save water resources. According to the introduction of China
Building Standard Design Institute, the Ministry of Construction has
revised the relevant national standards and installed "backflow
preventer" on the building water supply pipelines.
HS11X-16T Wire Mouth Backflow Preventere product structure:
Backflow prevention device is composed of two levels of back-stop
system and a drainage pressure relief system. The drainage pressure
relief system upper chamber is connected with the inlet end of the
first-stage check-back system.
The first and second-level check-back system is mainly composed of the
valve body, inlet joint, disc, gaskets, springs and so on.
Drainage pressure relief system is mainly composed of valve cover,
diaphragm, valve core, gaskets, drain, spring, air baffle, etc. The
outlet of air baffle must be connected to the drainage pipe network or
sewer.
HS11X-16T Wire Mouth Backflow Preventer working principle:
Backflow prevention device is added in the secondary checkback system,
a drainage pressure relief device, so that even if the secondary check
seal at the same time damage, it can also play a role in preventing
backflow pollution. Its working principle:
1. Normal water supply:
a. Clean municipal water from the first-class check-back system
through the drain to the second-level check-back system to export water
to users, the first-level check-in system to import high-pressure water
into the drainage diaphragm Cavity, and the diaphragm under the cavity
and the first stage check valve outlet (second stage check valve inlet)
communicating, due to its existence of a certain pressure difference ΔP1
= 0.035MPa, pushing the valve flap down, drain closed, backflow
preventer Normal water supply;
b. When the valve after the pipeline without users, water still. Such
as the inlet pressure remains unchanged, there is pressure before and
after the drain is still closed, such as the inlet pressure drops, the
intermediate chamber and the valve differential pressure ΔP1 ≤ 0.022MPa,
then the drainage control spring to open the spool, open the drain
Allow the middle chamber to drain, keeping ΔP1 at 0.035 MPa.
2. seal failure:
a. Backflow preventer after the pipe network pressure rises above the
valve inlet pressure, such as the second check valve seal intact,
high-pressure water will not backflow, the diaphragm up and down to
maintain the original pressure Poor, drain closed, no pressure
relief. When the second check valve seal leak damage, the second check
valve before the pressure increases, resulting in lower diaphragm
pressure drop across the drain, drain open, drain pressure relief; this
time, such as the first stop Check valve seal damage at the same time,
as the second-stage check valve back to the high-pressure water has been
decompression, it will not back to the first-class check valve.
b. When the valve pressure is higher than the pressure before the
valve, such as water pressure continues to decline, the pressure on the
diaphragm diaphragm pressure drop, the safety control valve to open the
drainage spring drainage regulator drainage. When the inlet pressure
drops to zero or negative pressure, the drain opens completely, the
water is drained and the air enters the vacuum chamber through the drain
to prevent siphon backflow.
3. The valve opening pressure ≤ 0.07MPa, the specification provides in
the range of 0.06 ~ 0.1MPa, inlet check valve working pressure is
0.035MPa.
HS11X-16T Wire Mouth Backflow Preventer main shape and installation size:
Specification DN (mm) |
Total length |
Inlet and outlet pipe diameter (in) |
Drainage pipe diameter (in) |
Weight (kg) |
DN15 |
169 |
1/2 |
1/2 |
1.2 |
DN20 |
172 |
3/4 |
1/2 |
1.4 |
DN25 |
236 |
1 |
1/2 |
3.5 |
DN32 |
321 |
11/4 |
3/4 |
7 |
DN40 |
321 |
11/2 |
3/4 |
7 |
DN50 |
321 |
2 |
1 |
10 |
Reminder:
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