X9 Series metering pumps Operating manual
Page 14 Copyright © - OBL Metering pumps - All rights reserved File: UT-4336 – Rev.0
GB
This valve protects the pump from pressure excesses generated by the pump itself during operation (discharge closed or blocked).
Therefore, only in this case can be avoided the installation of the external safety valve on the discharge pipeline, if this has been
installed to protect the pump.
The safety valve on the discharge pipeline is instead essential when system pressure can rise regardless of pump operation.
It is the responsibility of the user and/or installer to evaluate use or not of an external safety valve.
If during operation of the pump there is an excess of pressure higher than the setting of the internal safety valve, this valve opens and
discharges into the expansion tank a quantity of oil equal to the plunger displacement.
The internal safety valve opening is recognised and evident by means of:
- no pump flow (or at least greatly reduced)
- change of oil level in the tank
- increased noise of the pump (synchronised to the plunger strokes per minute)
6. INSTALLATION AND COMMISSIONING
6.1 INSTRUCTIONS FOR PROPER INSTALLATION
Because of the pumphead check valves work by gravity, it is essential that the housing valve axis must be perfectly vertical for proper
pump operation (also to prevent abnormal wear of the valves).
Provide also for installation of the following equipment:
- a pressure gauge next the pump. It must be installed before any other accessory installed on the discharge pipeline. Allows
to control the actual pump operating pressure (see "Discharge pipeline - Pressure gauge")
- an external safety valve immediately after the discharge connection and, in any case, before the ON-OFF valve. Protects
the pump and the plant from any accidents caused by excessive pressure (see "Discharge pipeline - External safety valve")
- a suitable thermal overload device. It protects motor from overloads and/or short circuits
Protect the pump from product leaks from the plant and/or corrosion phenomena. Avoid to arrange pipeline
nor installing accessories directly above the pump. Avoid installation in a closed, corrosive or stagnant location.
For outdoor installations provide proper protection for the pump from direct weathering actions (rain, wind,
dust, humidity). Consider the benefits of using a shelter and/or sliding panels. These devices significantly raise the
level of efficiency and safety of the whole pump.
Provide adequate free space around the whole pump to allow inspections and/or dismantling. In particular from the pumphead side, in
correspondence with the adjustment system and from the motor side (see figure 3).
If the pump is installed outdoors, a shelter is recommended, especially when the pump is equipped with electric actuators or other
delicate devices.
Moreover, for pumps with PLASTIC material pumphead also provide:
- appropriate shelter from direct sunlight, to avoid thermal deformation of the pumphead
- periodic controls and/or adjustments of pumphead locking bolt tightening torque
- periodic checks of the handled fluid temperature
- periodic checks of absence of chemical leakages from pumps connections or plant pipelines
6.1.1
Pump and pipeline fixing
Do not install the pump directly on a concrete foundation base. Use a steel baseplate make sure that is stable and well leveled. Fix
securely the pump to the baseplate using bolts and washers to ensure a proper load distribution.
The pipelines must be supported independently and their weight must not burden or create tension on the pumphead.
Therefore, besides the baseplate, the pump needs a supporting framework for both its suction and discharge pipelines.
6.1.2
Connecting to plant pipelines
On the discharge pipeline, to remove easily the pump from the plant, provide proper draining pipes near the pumphead.
We suggest to use short fittings to disassemble easily the flanged connections (see figure 4).
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