Install Instructions

Installation

Each 535H PRV comes with a snap-on protective cover which is designed to resist UV rays, for

outdoor locations, and to provide a significant level of protection against dust, dirt and water.

It does not protect against freezing; do not mount the valve in locations where it may freeze.

Protective cover not approved for use in plenum installations.

Before following the numbered steps listed, the installer must:

a) Be sure this pressure reducing valve is compatible with the other equipment in the system that

it may interact with or come into contact;

b) Assess and acknowledge all hazards related to the use of the this product, including potential

leakage, by installing this unit properly;

c) Install shut-off valve with pressure ports or similar equipment to measure the upstream pressure.

1) Turn all the faucets on before installing the pressure reducing valve, to flush the system and

expel any air remaining in the pipes.

2) Install shut-off valves upstream and downstream to facilitate maintenance operations.

3) The pressure reducing valve may be installed on either vertical or horizontal pipe.

However, it must not be installed upside down.

4) Close the downstream shut-off valve.

5) This mechanical pre-adjustment system, with the operating knob and pressure indicator

visible from both sides, allows the pressure reducing valve to be set to the required value in

the system prior to installation. The pressure indicator features incremental step movement,

so that the pressure can be adjusted continuously and the value displayed at 15 psi increments.

6) Remove the UV outdoor protective cover before step 7. It has 2 clips at the bottom edge which

holds it in place. Pull the clips outward slightly with your fingers and pull the cover off.

7) Set using the operating knob on the upper part of the valve. The pressure reducing valves are

factory set to a pressure of 45 psi.

8) Because the pre-adjustment dial displays in 15 psi increments, the optional

downstream outlet pressure gauge can be used to show the exact outlet

pressure, which is especially useful for applications requiring this precision.

9) After installation, the internal mechanism will automatically control the pressure, until the set

value has been reached.

10) Reinstall the UV outdoor protective cover, recommended for non-freezing outdoor climates.

11) Slowly reopen the downstream shut-off valve.

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Installation recommendations

1. Outdoor installation

Pressure reducing valves should not be installed outside the building unless properly protected from

freezing and the weather.

2. Each 535H PRV comes with a snap-on protective cover which is designed to resist UV rays,

for outdoor locations, and to provide a significant level of protection against dust, dirt and water.

It does not protect against freezing; do not mount the valve in locations where it may freeze.

Protective cover not approved for use in plenum installations.

3. Water hammer

Water hammer is a common reason for pressure reducing valve failures. Specific devices should

be installed to absorb water hammer for systems with this risk.