Although many different types of valves are used to control the flow of fluids, the basic valve types can be divided into two general groups: stop valves and check valves. Besides the basic types of valves, many special valves, which cannot really be classified as either stop valves or check valves, are found in the engineering spaces. Many of these valves serve to control the pressure of fluids and are known as pressure-control valves.
Eastern Standard Time. Offset: EST is 5 hours behind Greenwich Mean Time (GMT) and is used in North America. Countries: It is used in following countries: Bahamas, Canada, Haiti, Jamaica, Cayman Islands, Mexico, Panama, United States.
Canada uses six primary time zones. From east to west they are Newfoundland Time Zone, Atlantic Time Zone, Eastern Time, Central Time Zone, Mountain Time Zone, and the Pacific Time Zone. In Alberta Canada Daylight Saving Time begins at 2:00 a.m. local time on the second Sunday in March.