RELIEF VALVE INSTALLATION : WATER METER SHUT OFF VALVE : TRUE UNION BALL CHECK VALVE.
Relief Valve Installation
safety valve: a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level
The relief valve (RV) is a type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire.
A device designed to open if it detects excess temperature or pressure. Commonly found on water heating or steam producing systems.
The action or process of installing someone or something, or of being installed
A thing installed, in particular
A large piece of equipment installed for use
facility: a building or place that provides a particular service or is used for a particular industry; "the assembly plant is an enormous facility"
the act of installing something (as equipment); "the telephone installation took only a few minutes"
initiation: a formal entry into an organization or position or office; "his initiation into the club"; "he was ordered to report for induction into the army"; "he gave a speech as part of his installation into the hall of fame"
USS Midway Island
The outset of World War II saw a progression of American aircraft carrier design leading to larger and more heavily armored battle carriers. CVB-41, the lead ship of the Midway class, was ordered on August 7, 1942. She was the first fleet carrier to have the distinction of being named after a WWII battle. The carrier battle of Midway Island in June 1942 turned the tide of World War II and proved conclusively the potential of naval aviation. CVB-41 was the third American ship and the second aircraft carrier to bear the name of Midway. The name of the first USS Midway, a fleet auxiliary, was changed to the USS Panay in April, 1943. The second ship bearing the name was a jeep carrier USS Midway, CVE-63, which was changed to the USS Saint Lo in September 1944.
The product of the Newport News Shipbuilding and Dry Dock Company, she was the lead ship of three 45,000-ton Midway class CVBs, followed by USS Franklin D. Roosevelt, CVB-42 and USS Coral Sea, CVB-43. Two additional ships were canceled. Midway's keel was laid on October 27, 1943. The Midway class hull arrangement was modeled on the canceled Montana class battleships and was a new, much larger design intended to correct certain problems in the Essex class design. They had armored flight decks, requiring a much larger hull and lower freeboard, to reduce top weight. They also carried a very heavy AA battery of 5/54 weapons. The armor requirement was originally meant to counter 8" cruiser gunfire, but by the time the ships were laid down the focus had shifted to defending against aircraft attack.
Launched on March 20, 1945, she was sponsored by Mrs. Bradford William Ripley, Jr. Commissioned on September 10, 1945, with Captain Joseph F. Bolger in command, Midway was the largest warship in the world for the first decade of her service. Every aspect of her construction included the most modern design innovations possible. Twelve Babcock and Wilcox boilers powered four Westinghouse geared turbines which developed 212,000 horsepower for a maximum speed of 33 knots. Midway was designed with two catapults, fourteen arresting cables, and six barriers. Her design aircraft compliment was 137. In their early years, the Midway class carriers were the only ships capable of operating nuclear strike aircraft.
Midway was first underway on October 12, 1945 and performed her first arrested landing of an F4U-4 Corsair. Her Caribbean shakedown cruise lived up to all expectations, the only negative being a pronounced proclivity to drench the flight deck and the bow 40mm quad mount with green water in moderately heavy seas. Seriously overweight, Midway tended to plunge through, rather than ride over, heavy seas. The result of wartime demands that had continually added more tonnage, Midway quickly earned a reputation as a "wet" ship with her forward flight deck, gun galleries and hangar spaces frequently awash. In her final years, crewmembers described this plunging as "Rock & Roll."
In late February 1946 Midway became flagship for Carrier Division 1, operating in the Atlantic where she commenced flight training exercises in earnest. A few months late she embarked on her first major operational assignment, which included Operation FROSTBITE, conducted from March 1 to 28, 1946. Operating in the Labrador Sea and Davis Strait, MIDWAY, three destroyers and a fleet oiler conducted a cold weather evaluation of aircraft, personnel and ships. Embarked onboard Midway was a Coast Guard helicopter and crew, which signified the first use of a helicopter for plane guard duty. Helicopter air-sea rescue techniques were refined and the infamous "poopy suit" was evaluated. Midway conducted flight and refueling operations during these tests despite heavy weather damage to elevator hangar doors and having two to four inches of snow on the flight deck at various times.
Early in 1947, operating off the East Coast with her recently redesignated battle group, CVBG-1, Midway operated F4U-4B Corsairs and SB2-C-5 Helldivers. She conducted three training cruises in the Caribbean before sailing from her homeport at Norfolk, Virginia, on another experimental mission. On that landmark cruise, she was accompanied by scientific observers as her crew fired a captured German V-2 rocket from the flight deck on September 6, 1947. The purpose of Operation SANDY was to see if a large rocket could be launched from the deck of an aircraft carrier with little to no modifications. The actual ship launch test was only conducted once. There were prior tests carried out at White Sands on a simulated aircraft carrier deck to see what effects the rocket would have if it were to explode on the deck. This test marked the first time such a weapon was fired from a ship at sea or a moving platform. It decisively demonstrated the potential of large rocket fire from surface ships.
On October 29, 1947, Midway departed on her first deployment to the Mediterranean. Her air wing group was CVBG