Groth 1800A User Manual
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TABLE OF CONTENTS
I. INTRODUCTION
3
II. DESIGN AND FUNCTION
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1. FIGURE 1 – TYPICAL TANK INSTALLATION
4
2. FIGURE 2 – PRESSURE RELIEF
4
3. FIGURE 3 – VACUUM RELIEF
4
III. SAFETY
WARNINGS
5
IV. INSPECTION AND STORAGE
5
V. INSTALLATION
6
1. TABLE 1 – BOLT TORQUE AND STUD SPECIFICATIONS
6
2. TABLE 2 – VALVE WEIGHTS AT MAXIMUM SETTINGS
6
VI. MAINTENANCE
7
1. FIGURE 4 – VALVE CROSS SECTION
7
2. FIGURE 5 – PALLET DETAIL
7
3. TABLE 3 – STEM LENGTH
8
4. FIGURE 6 – SEAT INSERT DETAIL
8
VII. VALVE TESTING PROCEDURE
9
1. TABLE 4 – SEAT LEAKAGE TEST CRITERIA
9
VIII. MODEL
IDENTIFICATION
10
IX. PRODUCT LIMITED WARRANTY
11
X. APPENDIX A – MODEL 1800A PRESSURE/VACUUM RELIEF VALVE
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XI. APPENDIX B – MODEL 1810A VACUUM RELIEF VALVE
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XII. APPENDIX C – MODEL 1820A PRESSURE/VACUUM RELIEF VALVE
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XIII. APPENDIX D – MODEL 1830A PRESSURE RELIEF VALVE
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XIV. APPENDIX E – MODEL 1860A PRESSURE RELIEF VALVE
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XV. APPENDIX F – MODEL 1870A VACUUM RELIEF VALVE
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I. 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
rising temperatures cause increased evaporation or expansion of existing vapor. Conversely, a
vacuum condition may be created when pumping out or due to falling temperature. To prevent
tank damage, vapor must be allowed into or out of the tank at specified pressure/vacuum
conditions. The volume rate of venting depends upon the tank size, volatility of the tank contents,
the pumping rates and the temperature. Refer to API Standard 2000, ISO 28300, or local
regulations for the procedures to determine venting requirements.
A relief valve 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 installing or attempting to repair a valve.
For information not contained in this manual, please contact:
Groth Corporation
13650 N. Promenade Blvd.
Stafford, TX, 77477 USA
Phone: 281-295-6800
Fax: 281-295-6999
www.grothcorp.com