The bypass function is accomplished by applying a pilot signal to the I/O operator that is equal to or greater than the accumulator pressure. The pilot pressure forces the piston/seal container assembly to the fully open position where supply pressure flows through the regulator to the output circuit. Relieving the pilot signal allows the regulator to return to the original set pressure.

Some residents choose to install a backflow device on their hose bib. These are called vacuum breakers and they do not need to be tested. You can purchase them at most plumbing and hardware stores.

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The assembly consists of two spring-loaded check valves, a bypass assembly with a water meter and double check valve assembly, and two resilient seated indicating shutoff valves.

The double check detector assembly (DCDA) protects the potable water supply line from possible contamination or pollution from:

The reduced pressure backflow assembly (RPBA) is designed to prevent backflow caused by backpressure or backsiphonage and may be installed on either low- or high-hazard connections. Backsiphonage is when water moves in the direction opposite its regular flow.

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Please note that system maintenance is scheduled for Sunday November 3rd between 2:00 a.m. and 5:00 a.m. During these times, customers will be unable to view or pay their bills online or pay on our 24-hour automated payment line. We apologize for the inconvenience.

The location of the assembly, service size, and hazard level of the connection determine which backflow assembly you should use. If you have questions about which type of assembly you need, contact the Water Bureau Water Quality Inspection staff at 503-823-7480. Below are some assemblies commonly used in commercial applications. More information about the all the following assemblies can be found on our backflow assembly installation requirements page.

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During normal operation, the pressure between the two check valves, referred to as the zone of reduced pressure, is maintained at a lower pressure than the supply pressure. If either check valve should leak, the relief valve is designed to open and discharge water to the outside.

This assembly uses a mainline reduced pressure backflow assembly equipped with two resilient seated indicating shutoff valves, a bypass arrangement containing a smaller reduced pressure backflow assembly, and water meter. The RPDA must be installed at least 12 inches above finished grade or the 100-year flood plain, whichever is greater.

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One step you can take to protect our drinking water is to keep the ends of hoses out of pools or other containers while you are filling them. For example, if a hose is submerged in the pool, the chlorinated pool water may enter the drinking water system during a backflow condition. When filling pools, keep the end of the hose out of the pool and have a gap between the end of the hose and the surface of the water. This gap must be twice the diameter of the hose and never less than one inch.

Repair kits are offered for all KR pressure regulators in four different configurations: O-ring Kit, Seal Kit, Minor Repair Kit and Major Repair Kit. The table on the right specifies the contents of each kit. Part numbers for each repair kit may be found below.

Your plumber or licensed backflow assembly testing company will likely know which type of assembly to use. Backflow assemblies most commonly installed on residential irrigation systems are the double check valve assembly (DCVA) and the pressure vacuum breaker assembly (PVBA). The DCVA may be installed in a vault below finished grade. The PVBA must be installed at least 12 inches above finished grade.

The KR Internal Override (I/O) Bypass Operator* allows full accumulator pressure to be supplied downstream of the regulator without a dedicated 4-way bypass valve in the circuit. This reduces costs, space requirements and circuit piping while enhancing the intelligence of the hydraulic circuit.

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The AVB is among the simplest and least expensive mechanical types of backflow prevention device that the end user can buy. The PVBA is an outgrowth of the AVB and evolved out of a need to have an atmospheric vacuum breaker that was testable and could be used under constant pressure.

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PacSeal Hydraulics offers various accessories for all KR pressure regulators to improve the value and performance of a hydraulic control system. For remote operations, see our failsafe actuators. To improve the deadband for higher-regulated outlet pressures, see our high-pressure low deadband adjustment head. To reduce your hydraulic control system footprint and overall costs, see our internal override bypass options.

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Phone: 714-529-9495 Fax: 714-529-1366 Email: sales@pacsealhydraulics.com

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Failsafe actuators provide air or hydraulic remote operation with a manual override. Upon loss of pilot signal, there is no loss of regulated outlet pressure.

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› KR-12 Maintenance Instructions › KR-38 Maintenance Instructions › KR-75 Maintenance Instructions › KR-100 Maintenance Instructions › KR-140 Maintenance Instructions › KR-150 Maintenance Instructions › KR-200 Maintenance Instructions

Purchase as an actuator assembly using the stated below Part No. or as assembled to a regulator by specifying the operator type as “FSA” (air) or “FSH” (hydraulic) in the respective model number configurator.

There are two types of vacuum breakers: the atmospheric vacuum breaker (AVB) and the pressure vacuum breaker assembly (PVBA). The Water Bureau doesn't allow either the AVB or PVBA to be used for backflow protection.

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PacSeal understands that nothing lasts forever, which is why we provide OEM repair kits and maintenance instructions for all of our pressure regulators.

To prevent the regulated output pressure from being changed to a preset value, a KR pressure regulator may be transformed in the field with a tamper-proof conversion kit. To request a quote, specify Part No. 40-3175 with description.

If you are a returning customer you may notice new part numbers and fewer options. PacSeal has redesigned all KR (air, hydraulic, etc.) failsafe actuators to be universally operated at all rated pressures while better matching the output pressure of the manual operator. For more detailed information, check out our blog.

This adjustment head yields better precision for higher-pressure operation with the option of a manual or failsafe actuator. Existing PacSeal Hydraulics KR pressure regulators may be field-retrofitted (“L” and “D” KR’s only) or ordered as assembled to a regulator (model code “H” or “W”).

The double check valve assembly (DCVA) is commonly used to protect against backflow hazards that do not pose a health risk. They may be used under continuous pressure and protect against both backsiphonage and backpressure conditions. They can be installed above or below ground, but no more than 24 inches deep or five feet above the floor or grade.

A properly functioning RPBA will periodically release small amounts of water due to changes in line pressure up or downstream of the assembly.  For this reason, this type of assembly should be installed in areas that are not subject to water damage and have proper drainage. When backflow happens, a properly functioning RBPA may release some water. If the RPBA becomes clogged by debris or is not functioning properly and needs repair, it may discharge a large volume of water.