Groth 1660A User Manual
Page 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
.