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.
Eastern Time Zone is the Eastern Time Zone of the United States of America (USA) and Canada.n most states in the USA and in most provinces in Canada, Daylight-Saving Time (DST) is observed. During DST the time is shifted forward by 1 hour to EDT; which is 4 hours behind Greenwich Mean Time (GMT-4). After the Summer months Eastern Time is shifted back by 1 hour to US Eastern Standard Time (EST) or (GMT-5).