Operating Guide
7
Pressure Relief Valve
WARNING
This pump tank is designed and intended for cold (ambient
temperature) water storage at a maximum pressure of 125
PSIG, any use other than with cold water, or at a sustained or
instantaneous pressure in excess of 125 PSIG is unsafe. A pressure
relief valve of adequate size must be incorporated in the system.
The relief valve must be selected to pass the full capacity of the
pump when the pressure in this tank is 125 PSIG or less. Consult
pump manufacturer for pump capacity at relief pressure. The
manufacturer of this tank does not accept any liability or other
responsibility for personal injury or property damage resulting
from improper use, installation, or operation of this tank, or of the
system of which it is a part.
Failure to follow these instructions can cause tank to blow-up
and result in death, serious bodily injury or property damage.
Install a 125 PSI or less pressure relief valve directly into a
tubing so that any discharge will exit only within 6 inches above,
contact is made with any live electrical part. The discharge
opening must not be blocked or reduced in size under any
circumstances. Excessive length, over 30 feet, or use of more
than four elbows can cause restriction and reduce the discharge
capacity of the valve.
No valve or other obstruction is to be placed between the relief
valve and the tank. Do not connect tubing directly to discharge
drain unless a 6” air gap is provided. To prevent bodily injury,
hazard to life, or damage property, the relief valve must be
allowed to discharge water in quantities should circumstances
demand. If the discharge pipe is not connected to a drain or other
The Discharge Pipe:
or have any reducing couplings or other restriction.
pressure relief valve, and the discharge pipe.
WARNING
Do not install a shutoff valve between the tank and the pressure
relief valve. Failure to follow these instructions can cause the tank
to blow-up and result in death, serious bodily injury, or property
damage.
WARNING
Do not install a shutoff valve, plug or cap in your pressure relief
valve drain line. Failure to follow these instructions can cause
the tank to blow-up and result in death, serious bodily injury, or
property damage.
Filling the Pump Tank
It will be necessary to expel all air from the piping after new
installations, repriming and after the pump has been disassembled
distance from the pump. With the pump being allowed to run, wait
until a steady stream of water is coming from the faucet. This will
If after this, air in the lines still occurs, check on the suction side
of the pump (piping to pump from well) for piping leaks.
Installation Checklist
1. Is the pressure relief valve installed correctly? See “Pressure
Relief Valve” in the “Installing the New Pump Tank” section.
2. Will a water leak damage anything? See the “Locating the
Pump Tank” section.
Pump Tank” in the “Installing the New Pump Tank” section.
4. Turn on electricity to the pump.
FOR YOUR INFORMATION
Operational Conditions
HOW PUMP TANKS OPERATE
For a tank to operate satisfactorily, it must be capable of storing
a desired amount of water under pressure and permit a portion
of this water to be drawn off before the pump has to start.
Water is non-compressible, therefore, if a tank were completely
pressure would drop immediately.
the water level as shown in “A” and as water was pumped into
the tank, the air would rise to the level shown in “B” and the pump
would stop. When a faucet is opened, the compressed air, acting
like a spring, would force water out until the cut-in pressure is
reached, The amount of water between the two points is called
draw- off.
The amount of draw-off is dependent on the proportion of air and
water in the tank to start with. This is controlled by the location
of the air volume control and the “cut-in, cut-out” pressure of the
system. The pump tanks are designed to provide the maximum
draw-off possible for each size tank.
To function satisfactorily, the proper volume of air must be
maintained. This is accomplished by the use of an air volume
control of the type recommended for use with your pump. Water
has the ability to absorb air and unless a means of controlling this
is provided, the levels will change the draw-off reducing it until
a “water logged tank” condition is reached. See “Water Logged
Condition” on page 8.