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With over sixty combined years of experience in control equipment and building automation, directors Doug McIntosh and Paul Balazovjech had acquired access to a line of control valves, actuators, thermostats and controls used in HVAC and building automation systems (BAS). In 1989, with the proliferation of building automation systems throughout North America it became obvious that a valuable niche market existed in peripheral devices for BAS contractors coast to coast. A separate company was formed and Spartan Peripheral Devices began distribution. Since then, sales and manufacturing have expanded to include OEM manufacturers of fan coil units, building automation accounts coast to coast and exports to China, the Far East, Europe and the U.K.

The name Spartan was selected for two reasons: a simple, reliable and no-nonsense approach; and “spartan“ control of energy in an increasingly energy-conscious world. Spartan Peripheral Devices is a company devoted to the supply of peripheral components only, with no connection or interest in competing in the BAS scene.

Over the last few years, the product line has changed as manufacturing in North America takes over from imports. Today the company has reversed the tide, becoming an exporter of goods and producing a superior yet competitively priced North American product.

Research and development is an ongoing priority and new products and increasing sales show the results. As always, Spartan production goals center around robust quality, reliability, value, user-friendly interface and innovation. Featured are `smart` cards for self-adjusting actuators, auto span and auto zero electronics, modulating thermostats to augment BAS systems, coupled with bulletins such as the Control Value Selection Guide, and Electronic Control Strategies for Fan Coil Unit Ventilators.

Spartan covers the full range:

– Compact globe type zone valves, fail safe or fail in last position, two position or modulating, two, three or four-
port versions. Electric, electronic (both gear and thermoelectric hot wax), pneumatic and self-acting formats.
– ½“ through 2“ screwed and 21/2“ flanged, globe control valves, two-way or three-way, available with pneumatic, electric and electronic actuators, normally open, normally closed or fail in last position.
– Intriguing thermostats, differential pressure regulators and actuators compliment the line, and prompt assistance, good deliveries and how-to-do-it reports back up the service.

For building owners, consulting mechanical engineers, OEM manufacturers of HVAC equipment, building automation system installers, wholesalers and stock distributors, Spartan Peripheral Devices has a viable option.

VS410 pages

نسخه متنی

Differential Pressure
By-Pass Valves

DATA SHEET

VS-41 Self-Acting
Diffential Pressure By-Pass Valve
Description
The VS-41 differential pressure regulating valve is used to limit the
differential pressure of reverse return and other types of water
systems controlled by 2-way control valves.
As the control valves in a building close, the water circulation in the
building becomes restricted, and the differential pressure across the
valve increases to the point that the water passing through the valves
will start to squeal and the valve internals can become damaged, the
modulating control becomes difficult or impossible to achieve .
The usual corrective action is to:
1- Reduce the water temperatures during mild weather so that the
control valves must open wider and modulate better
2- Supply 3-way control valves with by-pass instead of 2-way
control Valves
3- Reduce the differential pressures by one of several methods (see
Spartan publications Valve Selection Guide and Control of Building
Differential Pressures on Building Risers) one of the methods is to
supply a VS-41 differential pressure regulators
These VS-41 regulators offer the advantage of controlling the pressures
where pressure is important. Usually, a large bypass valve
controlled by a differential pressure regulator is installed across the
circulating pump. They reduce the differential pressure for the entire
building.
VS-41 regulators are installed in the reverse return loops, one per
floor. In this way, the differential pressure is controlled at the respective
loop, the riser differential pressure remaining untouched and able to
pump to other floors or areas.
Benefits of the VS41:
• Less costly
• Simple to install and more precise (controlling zones rather
than the entire system)
• Easy to adjust
• Self acting
• Suitable for new installations or retrofits

Specifications:
Body: Brass CW617N
Cap: ABS
Internal Spring: Stainless Steel

1” NPT

Installation Instructions:
VS-41 differential by-pass valves are installed strategically throughout
the building. Generally speaking, provide one valve for each 50 U.S.
gallons pumped, i.e. each VS-41 can by-pass up to 50 U.S.GPM with a
differential pressure of 10 psi.

5 1/2” (140mm)

VS-41 regulators come in two ranges:
• VS-4110 - 0.15 to 0.70 bar, or 2 to 10 psi
• VS-4120 - 0.70 to 1.40 bar, or 10 to 20 psi
1” NPT x 1” NPT female x female threaded ports. Supply at bottom
port. For all hot and chilled water applications or 50% glycol mix

1 1/2” (38mm)

1”
NPT

1 3/4” (46mm)

Printed in Canada

The VS-41 remains closed when the pressure is less than set point. As
control valves close, the VS-41 modulates open to by-pass the amount
of water usually passed by the control valves. Differential pressure is
therefore kept constant in the respective loop.

Specifications believed correct at time of printing. Subject to change without notice.

Spartan Peripheral Devices telephone: (450) 424-6067 • fax: (450) 424-6071 • email: info@spartan-pd.com • website: www.spartan-pd.com

VS-41 Diff.Press.ByPassValve
(Eng) 11 Mar 2011

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اطلاعات تماس

VS410 pages

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