Metaltecnica srl pag. 5/13
Horizontal gate valve on vertical pipes
The two pipe sections must be properly supported in
order to prevent gate valve body from suffering
system stress.
Horizontal gate valve on vertical pipes.
Provide the proper supporting frame for the gate
valve and/or the hydraulic or pneumatic actuators.
Place the fixing screws and tighten them alternatively and uniformly as follows: tighten one screw, than
the diametrically opposed one and so on for all the screws.
Once the gate valve has been installed, check that all the accessories -such as hydraulic actuators,
pneumatic actuators, manual control levers- are properly connected.
Before gate valve commissioning, carry out some no-load opening and closing cycles checking proper
operation and seal.
Before disassembling the gate valve from the system for maintenance and/or replacement purposes,
the electrical supply and the hydraulic and pneumatic feed must be disconnected, releasing the pressure
of the lines and of the gate valve itself.
In the event that the gate valve is used in potentially explosive atmospheres, follow the indications below:
Consider whether the gate valve is suitable to the hazard zone in which it will be installed (see
Directive 99/92/EC).
Additional electric, mechanical, magnetic equipment can be applied exclusively when they are
compliant with the Atex Directive and provided with declaration of conformity and a classification suitable
to the area in which they will be installed.
Remember that the maximum surface temperature does not depend on the gate valve; it depends,
instead, on the operating conditions such as the temperature of the process fluid used, temperature of
the environment, external heat sources.
Do not disassemble the gate valve close to heat sources which, through radiation, conduction or
convection, may heat the gate valve and increase its surface temperature above the minimum ignition
temperature of the potential explosive atmosphere.
Carry out the proper gate valve grounding. Gate valves are provided with a screw on the upper head
to which an electric cable shall be connected. It will, thus, act as a conductor and discharge any possible
electrostatic currents in the system.
Before disassembling the gate valve, check that there is electrical continuity between the two pipe
sections.
During installation, maintenance and disassemble, avoid mechanical impacts, which may cause
sparks.
