Wey MF User manual

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WEY KNIFE GATE VALVE MF/MG/MH
Instruction manual
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weyvalve.ch | 2_30_12_en | Version 2016.07

WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual
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1General
1.1 Safety
1.2 Designated service
1.3 Structure and function
1.4 Marking
2Transportation, Storage
2.1 Transportation
2.2 Storage
3Installation
3.1 Preparation before installation
3.2 Installation site
3.3Installation position
3.4 Flow and pressure direction
3.5 Mounting
4Commissioning
4.1 General measures
4.2 Safety measures
4.3 Function Test
4.4 Pneumatically operated valves
4.5 Hydraulically operated valves
4.6 Electrically actuated valves
5Maintenance
5.1 Inspection
5.2 Operating cycles
5.3 Repacking
5.4 Seal replacement
5.5 Cleaning / Lubrication
6Trouble Shooting
7Removal
8Disposal
9Final remarks

WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual
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1General
1.1 Safety
Prior to any work or start-up and in order to ensure a proper functioning of our products, The instruction manual
must be observed. Alterations on the products need our written approval. For consequential damages due to
neglect of this direction, we have to reject any liability.
This symbol marks safety and risk advice. Follow all such advice in order to prevent any damage to human life
and objects.
The installation must be carried out according to established procedures and only by qualified personnel. Project
related data of valves, e.g. dimensions, materials and service range are found in the respective documentation.
The responsibility for the service application remains the sole duty of the end user.
1.2 Designated service
Wey Knife gate valves are deigned to shut-off pressurized piping systems. Depending of the construction,
finishing equipment and material valves can be used in fluid group 1 and 2 according to PED 2014/68/EU up to
category III. Wey Knife gate valves may be installed as end-of-line service, provided that the valves are classified
according to Art. 4 (3) PED 2014/68/EU. The max. working pressure must not exceed 0.73-times of the max.
nominal pressure at room temperature. In addition, the chapter 3.5 must be considered. For the valve design
working limitations refer to the relevant project data documentation and the maintenance manual. Should the
Wey Knife gate valve be installed in an explosion-protected area, the valve and the electrical and non-
electrical equipment must meet the explosion zone RL 2014/34/EU, ATEX
1.3 Structure and function
Figure 1: Structure
A
Body with seal
B
Gate
C
Manual actuation
D
Pneumatical actuation
E
Electrical actuation
F
Hydraulic actuation
A
B
C
D
E
F

WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual
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1.4 Marking
Manufacturer Example
Type / Material
Size / Flange drilling
Year / Fabr. No.
Nominal pressure
Operating pressure
Medium temp.
Ambient temp.
Air supply pressure 1)
Conformity / No notified body 1)
1) if applicable
2Transportation, Storage
2.1 Transportation
Transportation of the valves to their final destination (building site) shall take place in solid crates adapted to the
valves’ size. The valves shall be protected against exterior damage and atmospheric exposure.
Depending on the duration of transportation or storage and in view of the conditions, preservation shall take
place by welding valves into PE-film or adding sufficient drying agent or equal.
2.2 Storage
Until final installation the valves shall be stored in a dry, vented area. All function relevant parts shall be suitably
covered against humidity, dust or other contamination.
For longer storage periods or in case of unfavourable storage conditions which might affect later functioning, all
blank surfaces, e.g. stem, piston rod, sealing surfaces shall be suitably protected by long-term preservatives
against corrosion.
Factory applied preservatives shall be checked for possible transport damages and appropriately repaired, if
necessary.
For accessories mounted to the valves, such as electric actuators, limit switches, solenoids, etc., the respective
storage instructions of the manufacturer shall be observed with priority.
3Installation
3.1 Preparation before installation
Before installation, please make sure that the subject Wey Knife gate valve is in conformance to the service
conditions. The responsibility regarding applied service medium (corrosion resistance, pressure, temperature etc.)
is with the end-user. Please check, if the valve to be installed in an explosion protected area, the valve meets the
rules for the relevant zone.
Not correctly aligned pipelines must, by all means, be corrected before installation in order to avoid tensions or
even cracking of the valve body. Before final installation of the valves, any possibly applied corrosion protec tion
shall be thoroughly removed. All parts, and in particular the gate, stem and piston rod shall be free of dust and
dirt.

WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual
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3.2 Installation site
The mounting position must be chosen in such a way, that the knife gate valve can be checked and repaired at
any time without risks. For repacking purpose, the small side of the valve body shall be freely accessible (Fig. 2).
Figure 2: Installation site
= Repacking feature
Additional directives and guidelines for installation and operation of explosion protection equipment, when
installed into Ex-zones, must also be observed. Check if the equipment fulfils the safety requirements at site.
For outdoor installations, the valves shall be protected at site with shields or covers against severe weather
conditions like snow and ice.
3.3 Installation position
Wey Knife gate valves will be installed in one of the positions shown in Fig.3. Avoid a different installation
position whenever possible.
Figure 3: Installation position
Wey Knife gate valves from size DN400 up with extended or heavy actuators, which are not vertical installed,
should be supported on site. This is also recommended if vibrations of the piping line may occur.
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