Emerson Y695A Instruction Manual download pdf

Y695A Series

D102596X012

Instruction Manual

Form 5466

February 2010

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





This manual provides instructions for installation, startup,

maintenance, and parts information for the Y695A Series

vapor recovery regulators. Instructions and parts lists for

other equipment used with these regulators are found in

separate manuals.



Specications for the Y695A Series vapor recovery

regulators are listed on page 2. Specications for a given

regulator as it originally comes from the factory are stamped

on the nameplate.



The Y695A Series vapor recovery regulators are direct-

operated. They are used to sense an increase in vessel

pressure and vent excessive internal vessel pressure to an

appropriate vapor recovery disposal or reclamation system.

They may also be used as backpressure regulators or

relief valves.

The Type Y695A has internal registration

requiring no downstream control line.

The Type Y695AM has a blocked throat and

a downstream control line connection for external registration.



The Y695A Series vapor recovery regulators are

used to maintain a constant inlet (blanket) pressure with

the outlet owing to a system whose pressure is lower than

that at the inlet. When vessel pressure increases above the

setpoint of the regulator due to pumping in or thermal heating,

the force of the control spring is overcome by pressure

acting on the diaphragm. This moves the disk away from

the orice, allowing gas to ow from the vessel to the vapor

recovery system. As vessel pressure is reduced, the force

of the back disk spring causes the disk to move toward the

orice, decreasing the ow of gas out of the vessel. As vessel

pressure drops below the setpoint of the regulator, the disk will

seat against the orice, shutting off the gas ow.

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Figure 1. Type Y695A Vapor Recovery Regulator

W7381

1 2 3 4 5 6 7 8

Y695A Series 1

Summary of Contents

Page 1 - Y695A Series

Y695A SeriesD102596X012Instruction ManualForm 5466February 2010

Page 2

Y695A Series2 NPS 3/4 or 1 (DN 20 or 25) See Table 2 150 psi

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Y695A Series3INLET PRESSUREOUTLET PRESSUREATMOSPHERIC PRESSUREFigure 2. Type Y695A Operational SchematicB2648 and to collect tank vapors for the v

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Y695A Series4This procedure is for gaining access to the disk assembly, orice, and body seal O-ring. All pressure must be released from the

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Y695A Series5 Diaphragm head (key 7) Lower spring seat (key 50) Washer (key 36) Diaphragm plate cap screws (key 38) Secure usin

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Y695A Series6Table 2. Body Materials and Part Numbers (Body, key 1)  

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Y695A Series7224 46 47Figure 4. Types Y695A and Y695AM Assembly DetailB2649_1Figure 5. Type Y695AM AssemblyB2650_1

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Y695A SeriesThe Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fis