Liquid Controls V-7 User Manual

Installation & Parts Manual

V-7 Valves

Installation: M400-10

www.lcmeter.com

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

!!

! 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.

Publication Updates and Translations

The most current English versions of all Liquid Controls
publications are available on our website,
www.lcmeter.com. It is the responsibility of the Local
Distributor to provide the most current version of LC
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
are questions about the language of any LC Manuals,
Instructions, or Specification Sheets, please contact your
Local Distributor.

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.

Applications Class Description

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

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 single­stage valve with abrupt shut-off.
Single stage valves are
recommended when the
application flow rates are low.

Figure 1: V-7 Valve

Class

Number

2

Specifications

Model

V-7 (A2600 Series)
Used with M-5, M-7 & M-10 Meters

A2621 1½" & 2" 1, 2, 14

A2623 1½" & 2"

A2631 1½" & 2" 1, 3, 14, 15
A2651 1½" & 2" 3, 4, 14, 15, 16
A2652 1½" & 2" 1, 2, 16, 20
A2655 1½" & 2" 1, 30
A2684 1½" & 2" 20
A2690 1½" & 2" 20
A2693 1½" & 2" 20
A2670 1½" & 2" 7, 37
A2671 1½" & 2" 7, 27
A2672 1½" & 2" 7, 27, 37
A2681 1½" & 2" 8

A2682 1½" & 2" 8

Body & Seal Material

Aluminum with Viton Seal

Aluminum with Teflon Seal

Aluminum with Viton Seal
Aluminum with Viton Seal
Aluminum with Buna N Seal
Aluminum with Viton & Teflon Seal
Brass with Viton Seal
Brass with Viton Seal
Brass with Teflon Seal
Cast Iron with Viton Seal
Cast Iron with Teflon Seal
Cast Iron with Viton Seal
Stainless Steel with Viton Seal
Stainless Steel with Teflon Seal

Companion
Flanges

Working
Pressure

150 PSI
(10.3 BAR)

150 PSI (10.3 BAR)

150 PSI (10.3 BAR)

150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)
150 PSI (10.3 BAR)

Application
Class*

1, 2, 3, 4, 14, 15,
16, 30

How V-7 Valves Work

Inside the valve housing, a cylindrical bore connects the
valve inlet and outlet. Contained within the bore is a
piston assembly. Measured liquid exiting the meter outlet
is blocked from entering the valve inlet by the piston and
seal.

As the meter operator shifts the handle to the open
position, a mechanical linkage connecting the valve to
the preset counter trip ring causes a latch to engage and
hold the valve open allowing liquid to flow.

In the open position, the valve handle assembly
compresses the piston spring and pulls the piston shaft
and the piston away from the valve inlet. As the piston is
pulled away, it disconnects from the inlet seal, allowing
liquid to flow.

In most metering applications, closing the valve is a two­stage process. At a predetermined dwell period, the
preset counter, while counting down to “0”, releases a
latch mechanism, allowing the valve linkage to close to
approximately 10% of full flow. This initial closing causes
the piston inside the valve to slide toward the inlet,
restricting product flow.

As liquid is blocked by the piston, some product passes
through the dashpot washer bleed holes, creating the
hydraulic balance feature of V-7 Valves that allows the
valve to close slowly and smoothly. The dwell period
prevents hydraulic shock while permitting the preset
counter to register the remaining flow.

As the preset counter reaches “0”, the preset counter trip
ring disengages from the dwell position to the fully closed
position. This action releases the valve handle and relaxes
the piston spring, permitting the piston to contact the inlet
ring seal and complete its closure, stopping product flow.
This process is illustrated in Figure 2.

Figure 2: Valve Operation

3

V-7 Valves

Figure 3a: Cast Iron or Aluminum

Accessories

Dashpot Washers

V-7 Valves are offered with a variety of dashpot washers.
They are available in either brass or stainless steel
construction material. Four different bleed orifice
configurations (Figure 4) are available to ensure proper
closure regardless of viscosity. For viscosities greater
than 20,000 SSU, do not use a dashpot washer.

Flanges

Flanges (Figure 5) are offered in 1½ and 2 inch BSPT
and NPT sizes and weld types. Materials of construction
are aluminum, brass, cast iron, and stainless steel.
Teflon, Viton, and Buna seals and gaskets are available.

Linkage and Valve Handles

Valve handle (Figure 6) and linkage assemblies are
accessories used when normal manual ON and OFF
valve operation is desired. Different handle and linkage
configurations can be ordered separately for field
installations.

Figure 3c: BrassFigure 3b: Stainless Steel

Figure 4: Dashpot Washers

Figure 6: Left and Right Valve HandlesFigure 5: Flanges

4

New Installations

When ordered with a new metering system, the V-7
Series Valve is supplied mounted to the outlet side of the
meter as shown to the right. A liquid line must be
connected to the flange on the outlet side of the valve or
to the accompanying air check valve. The flange
connection on the V-7 valve is 1½” or 2” BSPT or NPT or
weld type.

!!

! WARNING

!!

Relieve Internal Pressure

All internal pressure must be relieved to zero pressure before

disassembly or inspection of the meter or any of the meter accessories.

V-7 Valves - Installation

Figure 7: V-7 Valve installed

Serious injury or death from fire or explosion could result from

maintenance of an improperly depressurized and evacuated system.

Retrofit Installations

Depending on the existing configuration, adding a V-7
Valve may require modification of the outlet piping.

After the internal pressure is relieved from the system,
the outlet line can be disconnected from the meter. The
new valve assembly can then be connected to the outlet
side of the positive displacement meter.

Installing the Valve

V-7 valves can be mounted in four possible positions
(Figures 8a-8d) depending on the required direction of
the valve output. The output can be front or back, top or
bottom. Standard valve position is configured with a top
outlet connection for flow from left to right and a horizontal
handle with an offset linkage assembly.

Positioning the Seal Ring

Each V-7 Valve is supplied with a seal ring. The inner
seal lip faces the valve housing and not the meter. Place
the seal on the valve and mount the valve to the meter
using the four bolts provided. Thread the four bolts into
the meter housing but do not tighten.

Figure 8a:
Standard Top
Facing Outlet

Figure 8b: Rear
Facing Outlet

Figure 8c:
Bottom Facing
Outlet

Figure 8d: Front
Facing Outlet

5