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WAREX VALVE GmbH
Glands
Valves for hot gases (temperature above 200°C), glands are used for the shaft seals instead of
O-rings.
Leaks in the gland packing can generally be eliminated by resetting the gland screws. If this is not
possible, the gland packing must be replaced. Excessive re-adjustment should be avoided.
Wearing parts
The primary wearing part of a butterfly valve is the sealing sleeve. Depending on the use, regular
inspections for wear are necessary (crucial for use as pipe end valve or in protective systems).
Especially in protective systems, wear of the seal can diminish the flame puncture resistance.
Failure to comply with this regulation means danger to life and limb and can also damage the
system.
The user can easily replace removable seal elements; vulcanized sleeves can be replaced only in
the factory.
Especially in protective systems the sealing sleeve must be inspected after a malfunction and
replaced, if necessary.
Complete seal and wearing part sets are available for pneumatic multiturn actuators.
Use only original replacement parts.
Replacing the seal
Assuming the valve has been removed, proceed as follows:
1. After disassembly of the actuator, the actuator shaft and the bearing journal, the valve disk is
free and can be removed from the housing. Check the disk for damage on the entire
circumference (the permissible dimension can be found in the drawing or ask the
manufacturer)!
2. Now, beginning at the collar, press the sealing sleeve out of the guide grooves and remove it
from the housing. Here also check the housing for damage!
3. When inserting a new sleeve, make sure that the collar of the sleeve clearly locks into the
housing grooves.
4. Check whether the O-ring seal of the actuator shaft is intact and replace, if necessary.
5. After assembly of the valve (in reverse order, see No. 1), check the butterfly valve for proper
functioning, in particular the actuator adjustment (see Drive chapter).
Technical function
The butterfly valves are designed as intermediate flange valves with a centric or eccentric valve
disk with bearings.
The stable housing is cast in one piece; only stainless steel housings are welded.
The housing lining and rubber flange coating have a one-piece design, whether they are
vulcanized or removable. The rubber flange coating is designed so that a complete seal in the
opening area and at the flange connections, in addition to proper functioning of the valve, is
guaranteed only without an additional flange gasket.
Disassembly:
Before disassembly, approval must be obtained from the responsible works management
(depending on local regulations). It is important that the pipes be de-pressurized, or in the case of
hazardous media, that they are emptied and rinsed with suitable means.
Before installation or removal and before performing any work on the butterfly valve, the electric
power and compressed air must be shut down by authorized personnel, for safety reasons.
Removal from the pipes is possible only with the valve disk closed.
WAREX-VALVE GmbH – Stauverbrink 2 – 48308 Senden
Tel. +49 (0) 2536/9958-0 – Fax +49 (0) 2536/9958-29
Revised: 05.06.09/RevD/opz (Subject to change)
ATEX1-EN-D
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