The preparing work before a, safety valve adjustment: 1, a visual inspection of the relief valve. See the presence of cracks, then the parts material spectral analysis, should comply with the regulations of design. Check valve body joint everywhere, there is normally about the screw joint, such as joint at a crack and screw does not conform to the specifications, should be dealt with in advance. 2, drum, superheater in situ pressure gauge and digital pressure gauge calibration qualified ( When the pressure gauge on the adjustment can be installed the standard pressure gauge) 。 3, ready to debugging tools, and communication tools ( Such as telephone, radio, etc. ) 。 4, ignition exhaust valve and accident should drain door test normal use. Adjustment, the provisions of the relief valve action pressure relief valve pressure determined on the basis of is based on the power generation enterprise technical standards, electric construction and acceptance specification ( Boiler unit) The provisions of the 1. 4 times the working pressure for the control of the relief valve pressure, take 1. 6 times the working pressure of safety valve for work pressure, pressure difference for opening and closing is 4% and pressure - 7%, the maximum of no more than 10%. Superheater control and pressure relief valve: 3. 82×1. 4 = 3. 97 mp а back pressure: 3. 81 - 3. Minimum 3 69 MP а. 58 MP а superheater work safety valve and pressure: 3. 82×1. 6 = 4. 5 MP а back pressure: 3. 88 - 3. Minimum 3 77 MP а. 64 MP а drum control and pressure relief valve: 4. 3×1. 04 = 4. 47 MPа （ About the 1 only) Back pressure: 4. 29 - 4. 16 MP а minimum 4. 02 MP а drum pressure relief Industrial Valves and seat work: 4. 3×1. 6 = 4. 56 MP а back pressure: 4. 38 - 4. 23 MP а minimum 4. After three, boiler running 10 MP а can work directly on the relief valve setting, setting the order as follows: 1, 2, drum drum work safety valve control valve 3, superheater outlet header work safety valve 4, superheater outlet header control valve four, setting method: 1, will not adjust the relief valve with a plunger ( Or gland nut) Crushing. 2, setting before the exhaust valve is controlled by the electric ignition switch for manual control at the scene. 3, adjust the exhaust steam pressure door control of combustion and ignition slowly rising, while pressure close to the action, should maintain a stable pressure, slow rise to setting pressure, such as more than rev bridge pressure is still not kai, exhaust valve should be open ignition, reduces the boiler steam pressure, or with the handle on the valve stem forced exhaust step-down after adjustment and pressure, try again. 4, rev. , to monitor back pressure, easy to adjust the back pressure. 5, when pressure requirements, try to do it again. 6, after adjusting a, adjust again the next. Five, the other requirements: 1, to empty row with pressure adjustment valve can be made. 2, close to rev. Pressure, be sure to slow booster. 3, safety valve adjustment, should strengthen the surveillance of steam temperature, steam pressure and water level, adjust to carefully, try to decrease the number of movements for single relief valve. 4, adjustment pressure relief valve will be subject to local pressure gauge, the rev bridge pressure, back pressure, should earnestly detailed records. 5, to ensure that the contact on the furnace and the control room personnel communication open. Six, safety precautions: 1, before setting, to check the installation and support of the exhaust pipes. 2, the relief Industrial Valves to set up the temporary platform. 3, safety valve, before the adjustment must be in the back seat, an under-voltage run under. Four, to adjust the personnel must have the noise prevention measures such as ear plugs. 5, adjust the relief valve before, should be the installation of a comprehensive check valve system is correct, exhaust pipe installation is firm, whether affect inflation. Before 6, adjust the relief valve, in all of the plant aerial work should stop, non-working personnel shall not enter the top, can't even close to the exhaust pipe. 7, relief valve in the road should be unobstructed, illumination is enough, with reliable communications facilities, wherever there is a temporary scaffold must have a railing, to prevent falling accidents, ensure the personal safety and safety valve adjusting process, such as an accident, should stop check work. Seven, calibration work schedule: the test and calibration by running the workshop organization, run workshop is responsible for the operation, the contact record and field work, maintenance workshop is responsible for the safety valve adjustment, production on-site guidance. In this paper, the keyword search: more technical articles valve product supply information
If you are a resilient valve fan, you definitely want to enjoy the best possible. The that you choose plays a major role with the kind of experience you have when using it.
Shenzhen Mech Valve Trading Co., Ltd. is working with the best teams, aligned with international standards and practices to focus on R&D and manufacture of products, and are continuously launching new products in the market. Get to know us at Mech Valve.
If something seems too good to be true, then it can be a , which provides y gate valve value over its cost.