Groth 1660A Manual de usuario descargar pdf (Pagina 2)

Page 2 of 16

TABLE OF CONTENTS

Description Pg.

Introduction 2

Safety Warnings 4

Inspection and Storage 4

Installation 5

Troubleshooting Guide 6

Maintenance 6

Tools 7

Disassembly 7

Replacement Parts 8

Film Seat Pallet 9

O-Ring Seat Pallet 10

Assembly 10

Drawings & Bill of Materials 12

Model Number 16

Product Limited Warranty 16

List of Figures

1 Tank Installation - Safety Eq 3

2 Nameplate 3

3 Suggested Tank Nozzle Dsgn 5

4 Film Pallet Assembly 9,13

5 O-Ring Pallet Assembly 10,13

6 Spindle Assembly-

Model 1660A

10

7 Spindle Assembly-

Models 1661A-1662A

10

8 Model 1402A Pilot Connection 11

9 Model 1661A with 1401E Pilot 12

10 Jackscrew Assembly 14

11 Model 1661A w/ 1402A Pilot 14

12 Model 1662A w/ 1401EV Pilot 15

List of Tables

1 1660A Series Pilot Operated

Valve Models

3

2 Inlet/Outlet Flange Gasket

Dimensions

5

3 Bolt Torque-Flat Face Flange 6

4 Bolt Torque-Raised Face

Flange

6

5 Soft Goods Kits 8

6 FEP Seat Film Dimensions 9

7 Bill of Materials 13

INTRODUCTION

Pressure and/or vacuum relief valves are

used on liquid storage tanks and other

process vessels or systems to prevent

structural damage due to excess internal

pressure or vacuum.

Storage tanks are pressurized when liquid is

pumped in, compressing the existing vapor or

when increasing temperature causes

increased evaporation or expansion of

existing vapor. Conversely, vacuum may be

created when pumping out or due to

decreasing temperature. To prevent damage,

vapor must be allowed to escape or enter the

tank at a specified pressure or vacuum

condition. The volume rate of venting

depends upon tank size, volatility of contents,

pumping rate and temperature. See API

Standard 2000 for the procedures to

determine venting requirements.

The pilot operated relief valve has two

principal advantages over other types of relief

valves:

1) It is bubble tight to set pressure.

2) It is fully open at less than 10% above set

pressure.

These characteristics permit operating

pressures nearer to the maximum allowable

working pressure of the tank. High operating

pressures reduce evaporation and total

venting volume, thereby reducing product loss

and the cost of processing emissions. A tank

may also have provisions for emergency

pressure relief due to fire exposure and/or

inert gas blanketing of the vapor space. A

typical tank installation is shown in Figure 1

which includes a 1661A Pilot Operated

Pressure-Vacuum Relief Valve, a 3011H

Blanket Gas Regulator and a 2500 Pilot

Operated Valve which provides emergency

pressure and/or additional vacuum relief.

Groth Corporation manufactures all of these

devices.

A Pilot Operated Valve (POV) must be

carefully maintained by a qualified valve

technician. It should only be assembled under

clean conditions, preferably in a service shop

environment. Carefully read and understand

this manual before attempting to repair a

1660A series POV. Groth Corporation

provides repair services for all products

manufactured by Groth Products Group.

The 1660A Series Pilot Operated Valve is

designed to provide both pressure and

vacuum relief for API 620 and 650 tanks and

other storage and process vessels. Several

configurations are available; these are

.

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