User Guide

Installation

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) 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.

7) 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.

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

value has been reached.

9) Slowly reopen the downstream shut-off valve.

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Installation recommendations

1. Installation below ground

Installation below the ground is not advisable.

2. Outdoor installation

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

freezing and the weather.

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.

PVC jumper nipple with male union

thread. The length of the jumper nipple

matches the 535H valve face-to-face

dimension, allowing the piping to be

completed prior to the installation of valve

and permitting quick change out from the

jumper to the valve.

Code Description Face-to-Face Dimension

NA11304 Jumper nipple for 535H ½" series 3 inch

NA11305 Jumper nipple for 535H ¾" series 3

/16 inch

NA11306 Jumper nipple for 535H 1" series 3 ¾ inch

NA11307 Jumper nipple for 535H 1¼" series 4

/16 inch