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Y690VB Series

D102594X012

Instruction Manual

Form 5465

December 2009

www.sherregulators.com

Y690VB Series Vacuum Breakers

Introduction

Scope of the Manual

This manual describes and provides instructions

and parts lists for Types Y690VB and Y690VBM

vacuum breakers. Instructions and parts lists for other

equipment used with these breakers are found in

separate manuals.

Product Description

The Y690VB Series vacuum breakers are used for

precise control of small capacity, low-pressure service

applications where an increase in vacuum must be

limited. These direct-operated vacuum breakers come

in NPS 3/4 and 1 (DN 20 and 25) body sizes and

have an 1/4 or 1/2-inch (6,4 or 13 mm) orice. The

individual products are described as follows:

Type Y690VB

The Type Y690VB is a vacuum breaker with internal

pressure registration requiring no downstream

control line.

Type Y690VBM

The Type Y690VBM is a vacuum breaker with a

control line connection and a throat seal for external

pressure registration.

Specications

Specications section gives some general ratings

and specications for the Y690VB Series vacuum

breakers. Individual breakers come from the factory

with the specic data stamped on the nameplate.

Installation

Warning

Personal injury, property damage,

equipment damage, or leakage due

to escaping gas or bursting of

pressure-containing parts may result if

this equipment is overpressured or is

installed where service conditions could

exceed the limits given in Specications

section, or where conditions exceed any

ratings of the adjacent piping or piping

connections. To avoid such injury or

damage, provide pressure-relieving or

pressure-limiting devices (as required

by the appropriate code, regulation,

or standard) to prevent service

conditions from exceeding those limits.

Additionally, physical damage to this

equipment could cause personal injury

or property damage due to escaping

gas. To avoid such injury or damage,

install the equipment in a safe and well

ventilated location.

Equipment operation within ratings does not preclude

the possibility of damage from debris in the lines

or from external sources. This equipment should

be inspected for damage periodically and after any

overpressure condition.

Figure 1. Type Y690VB Vacuum Breaker

W7292

1 2 3 4 5 6 7 8

Inhaltsverzeichnis

Seite 1 - Y690VB Series Vacuum Breakers

Y690VB Series D102594X012Instruction ManualForm 5465December 2009www.sherregulators.comY690VB Series Vacuum BreakersIntroductionScope of the ManualTh

Seite 2 - Y690VB Series

Y690VB Series 2SpecicationsBody SizesNPS 3/4 or 1 (DN 20 or 25)End Connection Styles(1)See Table 2Maximum Allowable Inlet (Positive) Pressure(2)150 p

Seite 3

Y690VB Series 3Table 1. Vacuum Pressure InformationVACUUM CONTROL PRESSURE RANGE(1)(2)CHANGE IN VACUUM TO WIDE-OPENSpring PART NUMBERSPRING COLORSp

Seite 4

Y690VB Series 4Warning!To avoid personal injury, property damage, or equipment damage caused by sudden release of pressure or explosion of accumulated

Seite 5

Y690VB Series 5 10. Install the spring case assembly (key 3) and control spring (key 6) on the diaphragm casing (key 4) so that

Seite 6

Y690VB Series 6Table 2. Body Materials and Part Numbers (Key 1)BODY MATERIAL END CONNECTION STYLEPART NUMBERNPS 3/4 (DN 20) Body NPS 1 (DN 25) BodyDu

Seite 7

Y690VB Series 7B2674_2Figure 3. Type Y690VB AssemblyB2674_1

Seite 8

Y690VB Series The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. F