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Summary of Contents for Wey MG
- Page 1 WEY KNIFE GATE VALVE MF/MG/MH Instruction manual 2.30.12 A S I STAG B RAND 1 / 1 4...
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Page 2: Installation
WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual General Safety Designated service Structure and function Marking Transportation, Storage Transportation Storage Installation Preparation before installation Installation site Installation position Flow and pressure direction Mounting Commissioning General measures Safety measures Function Test... -
Page 3: Structure And Function
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. -
Page 4: Transportation & Storage
Installation 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. -
Page 5: Installation Site
For outdoor installations, the valves shall be protected at site with shields or covers against severe weather conditions like snow and ice. 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. - Page 6 WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual Flow and pressure direction The Wey Knife gate valve is a bi-directional design (Fig.4). Depending on applications and valve design options a preferred flow direction must be considered. Liquid, gaseous and pneumatic conveyed solid fluids...
- Page 7 Mounting between flanges Figure 6: Mounting Knife Gate Valve Wey Knife gate valves MF, MG, MH are provide as wafer type valve and as end-of-line valve. The chapter 1.2 must be considered. The dimensions of the flange bolts, its number are found in the documentation.
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Page 8: General Measures
For powder or granular service, it should be observed that wetted or humid media which has tendency to cake to the gate is thoroughly removed before start-up. The Wey Knife gate valves are factory preserved and lubricated for transportation and storage, but they require depending on the service conditions, another lubrication before start-up. Recommended are water-repellent, temperature resistant and long lasting lubricants. - Page 9 WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual If hot gases or fluids are transported in the pipeline, ensure that no persons can touch the hot surfaces. It is also to ensure that no external interference of the control circuits can actuate the valve unintentionally.
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Page 10: Operating Cycles
On-site electric installations shall be in accordance with respective connecting diagram of the supplier. In addition, the specific operating instructions of the actuator supplier shall be observed. Before the first electrical operation, the Wey Knife gate valve gate shall be set to an intermediate position with the manual override, and then started. -
Page 11: Seal Replacement
WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual Repacking During a longer storage period of the Wey Knife gate valves or in case of great temperature fluctuations, the packing material in the transverse seal may shrink. This could lead to slight leakage through the transverse seal in the body chest area. - Page 12 WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual Pneumatic cylinders with closing cushion are fitted with a self-lubricating rod seal. Any leakages on the cylinders require the exchange of all sealing components. For valves with electric actuators, the lubrication point on the drive should be especially observed .
- Page 13 WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual Trouble Shooting Trouble Possible Cause Elimination Leakage at gate in body chest area Transverse seal untight Repacking of transverse seal according to instructions Transverse seal damaged – Replacement of transverse seal according to instructions, cleaning...
- Page 14 WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual Removal Before removing the valve, consider that the pipe system can be under pressure and that hazardous media could get into the environment. Respective precaution measures must be taken. Actuators must, in principle, not be removed if pipeline system is under pressure. Electric actuators must be made current less, respectively disconnected from circuit.
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