Schneider Electric VGS211F…CS Two Way Valve Instructions

Schneider Electric VGS211F…CS Two Way Valve Instructions

Installation

Hydraulic connections

Follow the fluid directions as shown in the diagram below. Two-way valve

It is advisable to install two-way valves on the return leg (excluding steam plants) since the lower temperature of the fluid allows a longer life of the gaskets.
Three-way valve

Three-way valves are designed as a mixing valve with two inlets A and B and one outlet AB, and not as diverting valves with one inlet AB and two outlets A and B

The VG311F may be used for diverting duties if the recom- mended differential pressure is reduced to one third of the mixing duty. Performance tables are detailed in the specifica- tion sheet.

Assembling

Before installing the valve, make sure the pipes are clean and free from weld slag in order not to damage the internal parts of the valve itself. The pipes must be perfectly aligned with the valve body and not be subjected to vibrations
For applications with fluids above 200°C (steam and over- heated water), install expansion joints to avoid the expansion of the pipes to cause undue stress on the valve body.
The valve can be mounted in any position within 180°.
During the actuator position adjustment, do not unscrew the stroke adjustment nut.
The valve must be mounted horizontally in all applications where the high temperature of the fluid, contributes, together with room temperature, to create around the actuator an ambient at a temperature higher than 50 °C, the maximum allowable value for its regular operation.
The actuators must not be installed in explosive enviroments and must not be subjected to steam jets or dripping water.
Leave sufficient room over the actuator, at least 10-15 cm., to allow the actuator disassembling from the valve body for eventual maintenance.

Start-up

Before the valve start-up, check:

Flow direction

It must correspond to the indications printed on the valve body and shown in Fig. 1 and 2.

Valve opening and closing

This must comply with the plant specification, keep in mind that:

Specification Sheet

Two-way valves (VGS211F)

Two-way valves (VG221F)

Three-way valve (VG311F)

Operating conditions

Temperature, nominal pressure and differential pressure on the valve must be within the values specified for each valve model on the relevant data sheets.

Pipe flushing

An anomalous valve flow action is caused, in almost all cas- es, by weld slag or foreign bodies entrapped between the valve seat and the plug, often causing damages.
To prevent such inconveniences, it is advisable to use filters upstream of the valve.
Moreover, the pipelines must be thoroughly washed by posi- tioning the valve stem at half stroke; this operation must be performed before start-up and after a prolonged shutdown of the system.

Maintenance

Stem packing tight check

VGS211F

Following the hydraulic installation it is necessary to check the tight of the stem packing placed on the bonnet, both in cases of low and high temperatures. The valves require periodic maintenance.
Valves have a stem packing with Teflon rings or, in case of extended neck valves for high temperatures, with packing.
In case of leakage, it is necessary to tighten the gland nut so until leakage ceases. Do not overtighten since this may cause the stem blocking.

VG311F – VG221F

Valves are equipped with a stuffing box sealed by a double O-ring and, therefore, they do not require any particular maintenance.
In case of irregular leakage, O-Rings and stem packing have to be replaced.

 Representative: Schneider Electric Limited, Stafford Park 5, Telford, TF3 3BL – United Kingdom
Manufacturer: Schneider Electric, Fabriksvägen 1, 137 37 Västerhaninge – Sweden

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References

• Schneider Electric Global | Global Specialist in Energy Management and Automation

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