Valves
Butterfly Type(Lug, Wafer, Dbl Flange)
Check Valve Type
Gate Type
Lever Linkage/Cam Act. Type
Relief Valve Type
Other Types
Atmospheric Relief Valves
SIZES
6” to 60” (EARV)
6" to 60" (EARA type 1 & 2)
6” to 60” (EARH)
GENERAL DESCRIPTION
Atmospheric relief valves provide automatic protection of costly
turbine condenser equipment. These valves are as important as trip
throttle valves, over speed governors, and other devices for power plant
protection. Everest atmospheric relief valves are designed and
manufactured with the finest materials and the highest quality
workmanship.
STANDARD MATERIALS
| Body Unit | stainless steel, Monel, Inconel, Hastalloy, and other high quality materials. |
| Trim | Stainless Steel, Bronze |
DESIGN FEATURES
Water Seal: All valves are equipped with water inlet and overflow
ports to provide a water seal around the seat. The overflow port ensures
no water head buildup on the disc. A water level gauge is provided
outside the valve.
Manual Lift: A side mounted handwheel and screw are incorporated to
manually lift the disc for inspection purposes or to keep the valve open
for maintenance work.
Operation and Maintenance: Everest Atmospheric relief valves open
and close automatically. Each valve needs to be installed vertically and
properly leveled for smooth operation. Special o”ring seals and a water
seal is provided for zero leakage in full vacuum conditions. Each valve
opens immediately when pressure increases slightly above atmospheric
pressure. Higher than atmospheric set pressures can be provided with
internally spring loaded discs. During regular maintenance and as many
times as possible, each atmospheric valve should be opened by turning
the hand wheel clockwise then closing the valves by turning
counter”clockwise. This process ensures non-binding and self-cleaning
valve action.
SIZE AND APPLICATION (inches)
| Max Steam Flow (lbs/hour) | For Protection* | For maximum non-condensing Operation* |
| Up to 7,500 | 6 | 8 |
| 7501 – 11800 | 8 | 10 |
| 11801 – 17000 | 8 | 12 |
| 17001 – 20000 | 8 | 14 |
| 20001 – 23100 | 10 | 14 |
| 23101 – 30200 | 10 | 16 |
| 30201 – 38200 | 12 | 18 |
| 38201 – 45000 | 12 | 20 |
| 45001 – 47200 | 14 | 20 |
| 47201 – 62000 | 14 | 24 |
| 62001 – 68000 | 16 | 24 |
| 68001 – 82000 | 16 | 30 |
| 82001 – 106000 | 18 | 30 |
| 106001 – 120000 | 18 | - |
| 120001 – 170000 | 20 | - |
| 170001 – 250000 | 24 | - |
| 250001 – 380000 | 30 | - |
| 380001 – 550000 | 36 | - |
*The sizes listed ‘For protection’ are normally used under ordinary condensing operation and are for general reference only. If it is desired to operate the turbine temporarily non-condensing at its maximum noncondensing capacity, the sizes listed under ‘for maximum noncondensing operation’ should be used. Actual design conditions, i.e. flow, relieving pressure, should be established by the user and condenser manufacturer. The valve supplier should certify the valve relieving capacity and design.
The piping and valve size should be large enough to protect the condenser from exceeding 10psig + 10% accumulation. Tolerance on set pressure of relief valve not to exceed +- 5%
APPROXIMATE FINSHED WEIGHTS
| Valve size | Vertical type | Horizontal Type |
| 6" | 165# | 220# |
| 8" | 258# | 340# |
| 10" | 325# | 460# |
| 12" | 476# | 652# |
| 14" | 563# | 760# |
| 16" | 605# | 823# |
| 18" | 751# | 1095# |
| 20" | 812# | 1206# |
| 24" | 1118# | 1698# |
| 30" | 1726# | 2537# |
| 36" | 2908# | 3776# |
