Instruction Manual

ManualsBrandsEmerson ManualsReducing ValveEMERSON Spence Type D34 Water Pressure Reducing Valve

▲

WARNING

Failure to follow these instructions or

to properly install and maintain this

equipment could result in an explosion,

re and/or chemical contamination

causing property damage and personal

injury or death.

Emerson Pressure Reducing Valve must

be installed, operated and maintained

in accordance with federal, state and

local codes, rules and regulations

and Emerson Process Management

Regulator Technologies, Inc.

(Emerson) instructions.

If the valve vents gas or a leak develops

in the system, service to the unit may be

required. Failure to correct trouble could

result in a hazardous condition.

Installation, operation and maintenance

procedures performed by unqualied

personnel may result in improper

adjustment and unsafe operation. Either

condition may result in equipment

damage or personal injury. Only a

qualied person shall install or service

the Type D34 pressure reducing valve.

Introduction

Scope of the Manual

This manual provides instructions for the installation,

start-up, maintenance, troubleshooting and parts

ordering for Type D34 pressure reducing valve.

Spence Type D34 Water Pressure

Reducing Valve

Figure 1. Type D34 Pressure Reducing Valve

Product Description

Type D34 water pressure reducing regulator is

designed for dead-end water service where the ow is

intermittent and changes rapidly, as on domestic water

systems. It is especially e󰀨ective in regulating the ow

of water to such fast acting equipment as ushometers

and snap cocks. The design is self-contained, direct

operated regulator.

Instruction Manual

VCIMD-14932

November 2021

Type D34

www.SpenceValve.com

Summary of content (8 pages)

PAGE 1
Instruction Manual VCIMD-14932 Type D34 November 2021 Spence Type D34 Water Pressure Reducing Valve ▲ WARNING Failure to follow these instructions or to properly install and maintain this equipment could result in an explosion, fire and/or chemical contamination causing property damage and personal injury or death.
PAGE 2
Type D34 Specifications This section lists the specifications for Type D34 water pressure reducing valve. Factory specification are stamped on the nameplate fastened on the valve at the factory. Flow Coefficient, Cv NPS 1 / DN 25: 3.3 NPS 1-1/4 / DN 32: 7.5 NPS 1-1/2 / DN 40: 10.4 NPS 2 / DN 50: 14.4 NPS 2-1/2 / DN 65: 21.
PAGE 3
Type D34 Principle of Operation The Type D34 is a direct-operated regulator. When the water supply is cut in, the valve is in wide open position. Water flowing to the system creates a rising delivery pressure which feeds back through the control ports to the underside of diaphragm (key 8). As the pressure on diaphragm approaches a balance with the force exerted by adjusting spring (key 5), disc (key 20) is throttled to a position where just enough water flows to maintain the set delivery pressure.
PAGE 4
Type D34 Figure 2.
PAGE 5
Type D34 Valve Setting (Refer to Figure 2) Troubleshooting If the threaded connection between stem coupling (key 11) and stem (key 14) is disturbed, follow these steps: Inadequate flow or delivery pressure: 1. Insert stem assembly (A) and hold disc on seat ring in closed position, as shown in Figure 2. 2. Screw stem coupling (B) on stem until travel setting T is reached. 3. Remove stem assembly (A) and lock setting by drilling hole and inserting dowel pin (C).
PAGE 6
Type D34 Table 2. Type D34 Parts List ITEM NO.
PAGE 7
Type D34 Table 2. Type D34 Parts List (continued) ITEM NO.
PAGE 8
Type D34 Figure 3. Type D34 Pressure Reducing Valve Assembly Drawing SpenceValve.com Emerson Automation Solutions Americas McKinney, Texas 75070 USA T +1 800 558 5853 +1 972 548 3574 Asia Pacific Singapore 128461, Singapore T +65 6777 8211 Europe Bologna 40013, Italy T +39 051 419 0611 Middle East and Africa Dubai, United Arab Emirates T +971 4 811 8100 SD1103A VCIMD-14932 © 2021 Emerson Electric Co. All rights reserved 11/21.