Buy McQuay Gas Valve Parts

McQuay Gas Valves are used to handle and control the flow of gaseous media such as natural gas. There are different types of gas that are used in various applications. Angle allow maximum flow for gases by allowing them to flow through in an angle. Balancing maintain a consistent temperature and compensate for pressure drops. For tight shut-offs, ball are most suitable. For an one-directional flow and no back flow, butterfly are suitable. There are other types like blow-off, cartridge, check, and control . Diaphragm separate the flow of gases from the closure element. Directional steer flow through selected passages. These devices are made from metals like aluminum and copper as well as metal alloys such as brass, bronze, steel, cast iron and even stainless steel. Aluminum offers good electrical and thermal conductivity and does not get oxidised. These control the flow and are vital components in almost all of the systems manufactured by the company for handlers, heat pumps, chillers, etc.

Hot Gas Bypass

Hot gas bypass (HGBP) used with distributor-type DX coils should be externally equalized. Their purpose is to maintain minimum suction pressure to the compressor. This is best done when the valve is responding to suction pressure. Over sizing the HGBP valve may cause:

• System inversion

• Loss of oil management

• Prevent the compressor from cycling off (overheating)

• Poor efficiency

Hot gas valve selection is based on:

• Refrigerant type

• Minimum allowable evaporating temperature at reduced load

• Minimum compressor capacity

• Minimum system capacity

• Condensing temperature at minimum load – typically 80°F (26.7°C).

N/O Pilot Valve (Carrier / McQuay)

The V-6040 Pilot Valve is designed for use on system powered terminal units. It can be used for normal temperature control and as a failsafe device for fire management systems. Upgraded system powered terminal units consist of duct , thermostat, pressure regulator, in-line filter and the V-6040 pilot valve. The thermostat can be a low or high volume room thermostat using a standard 15 or 20 PSIG (103 or 138 kPa) supply. Duct may be the inflatable bag type or the dual disc cone type operated by expandable bellows.

The V-6040 Pilot Valve Features include:

• Compatibility with system terminal units; allows Fire Management Override Night Setback

• Adjustable set point for sequencing applications

• Allows upgrading by adding wall mounted room thermostats

• Used with High or Low Volume Controllers

pressure that operates the duct valve is taken from the supply duct through the in line filter and pressure regulator. Duct pressure to the regulator must be 1 to 6 in. WG (.25 to 1.5 kPa).

When the V-6040 Pilot Valve is used as a failsafe device for fire management systems, a low pressure, system powered thermostat is used. On inflatable bag systems, 20 PSIG (138 kPa) from a fire management/smoke control system, is applied to a normally open V-6040 to close it. During normal operation the duct are controlled by the system powered thermostat. In a failsafe condition the 20 PSIG (138 kPa) is removed from the V-6040 diaphragm which exhausts all pressure from the duct allowing full flow in the duct to pressurize the surrounding area and seal off the space.

McQuay Fluidtech Cooling Sequence

On demand for full cooling, the room thermostat will supply full control signal to the V-6040's. This will exhaust from the black connection of the McQuay fluidic switch and allow the pressure to increase in the white connection. The fluidic switch will then divert system from the plenum to atmosphere and allow the bellows to exhaust and open the outlet into the space.

McQuay International offers a complete line of water-cooled chillers from 30 to 2500 tons utilizing scroll, rotary screw and centrifugal compressors. The 30 to 200 ton, WGZ packaged, scroll compressor chillers are a product of the McQuay commitment to offer energy-efficient equipment design. It is a design approach that carefully combines top quality compressors, efficient shell-and-tube condensers, low pressure drop brazed plate evaporators and state-of-the- art controls into a unit of uncompromised operating efficiency and reliability.

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