Instruction Handbook KL
Chapter 4
BA KL V11 en
10/2014
page 4-3
Possible damage
If the pump is not vented, pressure may rise as the lock medium heats up during
operation. This will cause the lock medium to be pressed into the suction chamber of the
pump. Make sure the seal is properly filled (
Chapter 7 maintenance).
4.12.2 Stuffing box seal
Built-in stuffing box seals must be slackened before being started up for the first time. To do this,
loosen the nuts of the stuffing box gland and then tighten them again only slightly. After approx. 10
minutes in operation, tighten the stuffing box until only a small quantity of the medium leaks out to
lubricate the seal (approx. 1-2 drops per minute) (
chapter 7).
4.12.3 Stuffing box seals with buffer water ring
This kind of stuffing box seal is equipped with a lock water ring. Connect the stuffing box to a lock
water supply system before starting up the pump. In most cases, it will be enough just to activate the
supply. The pressure in the lock water area should be approx.
1 bar
higher than the pressure in the
pump suction housing.
4.12.4 Mechanical seal, single-acting
Pumps with mechanical seal are to be used exclusively in the fixed rotational direction, unless the
mechanical seal is made for both rotational directions (
data sheet). Make sure the permissible
pressure load of the seal unit is not passed.
Make sure the mechanical seal really does come into contact with the medium and therefore is
lubricated and cooled.
4.12.5 Face (LWD) seal with mechanical seal (double-acting)
This type requires a quench fluid. The quench fluid is proposed to the sealing case under pressure.
The pressure of the quench fluid should be approx.
1-2 bar
higher than the counter pressure on the
side of the media. The maximum pressure in the seal should not exceed
10 bars
.
4.12.6 Mechanical seal, double-acting, back to back arrangement
This type requires a buffer fluid. The quench fluid is proposed to the sealing case under pressure.
The pressure of the quench fluid should be approx.
1-2 bar
higher than the counter pressure on the
side of the media (suction housing).
4.12.7 Mechanical seals, double-acting, tandem arrangement
This type also requires a buffer fluid in the sealing case. The pressure in the intermediate sealing
compartment must be lower than the pressure in the product chamber of the pump. If this type of
seal is subjected to quench pressure, this will cause the seal on the medium side to open, which can
pollute the medium.
Possible damage
Connect double acting mechanical seals to a local locking pressure system!
ATTENTION
ATTENTION
