DCVA Backflowtest Procedure

In this video, we’re going to look at the production flow through this pressure reducing control valve package, configured with a Bellows Controlled High Pressure Pilot.

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Dcva backflowinstallation

Now, supply pressure is blocked from going into the control valve actuator, and instead the diaphragm pressure is rerouted out through the pilot and vented.

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Once pressure has vented, and there is no longer enough pressure to overcome the pilot spring, the pilot diaphragm assembly will move back down.

Double Check Valve Assembly diagram

When the adjustment screw is unthreaded, there is no downward pressure on the pilot diaphragm assembly. Once the adjusting screw is threaded farther into the bonnet, the spring puts pressure on the assembly, which positions the pilot plug to open the flow of supply pressure into the control valve actuator.

When the adjustment screw is unthreaded, there is no downward pressure on the pilot diaphragm assembly. Once the adjusting screw is threaded, the spring puts pressure on the assembly which positions the pilot plug to open the flow of supply pressure into the control valve actuator.

As the sense pressure approaches the set point, it causes the bellows to contract, actuating the bellows stem to move it upward against the diaphragm assembly.

In this example, the downstream pressure will hover around 99 PSI, where the valve is barely open, to 100 PSI, when the valve is closed.

This supply pressure pushes up on the control valve diaphragm working against the tension of the spring. This opens the valve and allows upstream pressure to move downstream.

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Next, downstream gas moves through the sense line protector. This device protects the pilot from over pressurization. It blocks the downstream pressure when it exceeds the adjustable limit and reopens when inlet pressure drops below the limit.

For reducing pressure in high pressure application, you can use a High Pressure Control Valve package set up for pressure reducing application.

Dcva BackflowPreventer

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As this cycle repeats, liquids continue to fall out of the supply gas into the drip pot where it will need to be drained regularly, depending on the conditions.

These assemblies are installed either above ground or in a box. They are attached to the backside of the drinking water meter toward the building. These smaller Double Check Valve Assemblies (DCVA) or Reduced Pressure Zone Assemblies (RP) are painted blue to indicate that they carry drinking water. The body has two cylindrical areas that face up, small test cocks (ports) and a valve at each end. They are around 16 inches to 24 inches long.

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14 Nov 2019 — Pressure reducing valves are devices installed on the main water line which actively reduce the pressure of water travelling into your home.

Dcva backflowreplacement

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RPZbackflow

A backflow prevention assembly is a device attached to the drinking water meter that keeps potentially contaminated water from the main water line. They are required by Florida Administrative Code and by local ordinance to protect the drinking water supply, keeping you healthy and safe. These assemblies are tested and repaired as needed to meet minimum requirements.

The rapid but stable repositioning of the pilot plug produces a throttling action, and the valve will open and closed by only a small percentage to maintain the set point.

The supply gas regulator reduces the upstream pressure to 30 PSI;to provide supply pressure to the pilot after passing through a filter.

Beginning with the control valve in a closed position and the adjusting screw not yet calibrated to a desired set point, the upstream pressure begins to flow – in this example, up to a pressure of 400 PSI.

The majority of these assemblies are found in the drinking water meter box. They are either a brass, vertical cylinder attached to copper pipe (a dual check) or a horizontal brass cylinder attached directly to the meter (a T-10 combo).

Next, downstream gas moves through the sense line protector. This device blocks pressure to the pilot when it exceeds the working pressure of that pilot.

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DCVAvs DCDA

As this cycle repeats, liquids continue to fall out of the supply gas into the drip pot where it will need to be drained regularly, depending on the conditions.

Upstream pressure flows into the Drip Pot which knocks out liquid from the supply gas which could be detrimental to other instruments.

These larger assemblies are installed above ground and are located behind the meter. The Double Check Valve Assembly (DCVA) is used for a typical large business, condominium or high-rise building. The Double Check Detector Assembly (DCDA) is installed on a line that supplies water to the building’s fire suppression system, which includes the fire sprinklers or standpipes. They look like a larger version of the smaller assemblies with larger valves that have a stem and wheel-type shut-off valve. They range from 10 feet to 20 feet long, including the pipe on both ends. The DCVA is painted blue and the DCDA is usually painted red.

In this video, we’re going to look at the production flow through this Pressure Reducing High Pressure Control Valve Package configured with a Diaphragm-Controlled High Pressure Pilot.

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This Reduced Pressure Zone Assembly is used on buildings like chemical manufacturing plants, large auto repair shops and schools with chemistry labs. It also is installed on the backside of the drinking water meter. It looks very similar to the DCVA except that is has an additional valve on the underside of the assembly. This valve is called a “relief valve.” It is also painted blue and is roughly the same length as the DCVA assembly.