29
Installation
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Anti-siphon check valve
This pump is provided with an anti-siphon check valve. Use this valve at the injection point unless there is a good rea-
son not to do so. Be absolutely sure to install it in the following cases.
• When the injection point is open to the atmosphere and liquid is to be injected at a position lower than the level of the
liquid in the tank (prevention of siphoning)
• When the liquid is to be injected inside the suction-side pipe of a volute pump, etc.
• When a chemical greatly exceeding the pump’s rated discharge volume is being fed (prevention of overfeed)
✽
Even with a rising pipe, overfeed may occur if the pipe is too long.
(1) The anti-siphon check valve has an R1/2 external thread. Provide an Rc1/2 internal thread at the injection point.
Connecting
Main pipe
Injection point
(Rc1/2)
Nylon tube
Cap nut
Sleeve
Valve body
Assembled state
IMPORTANT
• Be sure to securely connect the nylon tube and anti-siphon check valve as well as the anti-siphon
check valve and injection point.
• The anti-siphon check valve will be corroded by some chemicals, and so such chemicals cannot be
used. For special chemicals, consult with a TACMINA representative separately.
(2) Remove the cap nut and sleeve, and attach only the valve body to the main pipe (injection point).
(3) Pass the nylon tube through the cap nut and sleeve, and firmly insert its end until it touches the back end of the
groove in the valve body.
(4) In this state, tighten the cap nut by hand as far as it can be turned.
(5) After tightening the cap nut by hand, use a wrench to tighten the cap nut two or three more turns.
09-32̲PZD総合取説̲E.indd 29
09-32̲PZD総合取説̲E.indd 29
2010/07/22 8:42:35
2010/07/22 8:42:35
