Liquid Controls V-7 Valves - Manual (Page 2)

2
Table of Contents
Description Page Number
General Information ...............................................2
Application Class Description ................................2
Specifications .........................................................3
How V-7 Valves Work.............................................3
Accessories ............................................................4
New Installations ....................................................5
Retrofit Installations ...............................................5-7
Setting the Dwell ....................................................8
Setting Zero Shut-off ..............................................9
Disassembling ........................................................10-11
Reassembling ........................................................11
Illustrated Parts Breakdown ...................................12-15
General Information
Liquid Controls V-7 Valves are designed for a wide range
of applications and flow rates and have minimum
pressure loss. Careful engineering and construction
ensure smooth, accurate, and controlled operation.
The V-7 Series mechanically actuated piston valves are
available in 1½” and 2” sizes, and are designed for
mounting on the meter outlet to provide tight shut-off with
smooth and easy operation regardless of system line
pressure. The valves may be manually operated or
connected via a mechanical linkage to a preset counter
on the meter for singe-stage closure (for low flow
applications) or two-stage closure with dwell period to
eliminate hydraulic shock. The valves are indexible in
90º increments for up, down, or side facing outlet.
V-7 Series valves offer the important advantage of a
pressure-balanced dashpot design that ensures precise
valve response and soft closure at shut-off. Operation is
smooth and easy regardless of the line pressure since
the vector forces are directed at right angles to the valve
opening mechanism and are never in opposition to it.
Depending on the preset, the
valve may be operated as either
a two-stage valve with dwell
period shut-off or as a single-
stage valve with abrupt shut-off.
Single stage valves are
recommended when the
application flow rates are low.
! ! ! ! ! WARNING
• Before using this product, read and understand the instructions.
• Save these instructions for future reference.
• All work must be performed by qualified personnel trained in the proper application, installation, and
maintenance of equipment and/or systems in accordance with all applicable codes and ordinances.
• Failure to follow the instructions set forth in this publication could result in property damage, personal injury,
or death from fire and/or explosion, or other hazards that may be associated with this type of equipment.
Applications Class Description
Class
Number
Refined petroleum products 1
Aviation and jet fuel 2
Variety of products including: liquid sugars, sweeteners, syrups, & vegetable oils 3
Treated waters & solvents where no red metals are allowed 4
Chlorinated solvents 7
Acidic pH liquids including: nitric, phosphoric, glacial acetic acids, citric juices, & vinegar 8
Crude Oil 14
Oil-based & Water-bases latex products, polyester, resins, herbicides, & nitrogen fertilizers 15
General Solvents, 200 proof alcohol 16
Batch process water meter service 20
Alkaline pH Liquids including: latex products, adhesives, & liquid fertilizers 27
Herbicides 30
Sodium Hydroxide solutions, high sulfur crude oil, & alkaline pH liquids 37
Figure 1: V-7 Valve
Publication Updates and Translations
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Manuals, Instructions, and Specification Sheets in the
required language of the country, or the language of the
end user to which the products are shipping . If there
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Local Distributor.