Supply of electromagnetic relief device

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Supply of electromagnetic relief device

Information Name:	Supply of electromagnetic relief device
Published:	2011-03-30
Validity:	30
Specifications:
Quantity:	0.00
Price Description:	Negotiable
Detailed Product Description：	Electromagnetic relief device Electromagnetic relief device First, use: Electromagnetic relief device is to prevent the boiler steam pressure protection device through the specified value, before the safety valve open, remove excess steam to ensure that the provisions under the pressure of the boiler in operation. While reducing the number of safety valve to extend the service life of valve. Second, the structure outlined, and it works: The device mainly consists of electromagnetic relief valves, electrical equipment, manual gate valves and other components, which can be controlled automatically or by operator command action. 1. Electromagnetic relief valve Electromagnetic relief valve consists of the main valve, the auxiliary valve, solenoid composed of three parts. The main valve from the valve, filling chamber, pins and other components. Solenoid coil from the start to protect the coil and trip switches and other components. Through the limit switch can be protected from start to switch to the coil winding, while a signal. The main valve and secondary valve seat in order to meet the thermal deformation of ductile materials by using the thermal disc structure. Seat sealing surface are made with cobalt matrix alloy cladding. How it works: Step process in the boiler, the medium from the main valve and the guide sleeve into the space between the back of the main valve, under pressure in the medium remain sealed. When the boiler pressure exceeds the set value, the pressure transmitter signal, the solenoid excitation produces gravity, through the auxiliary valve lever drive, when the main steam valve on the back of the exhaust pipe from the main valve back pressure valve sharp decline, the main flap valve in the inlet steam under pressure, quickly rising exhaust steam. When the boiler pressure returned to normal pressure, the pressure transmitter signal, cut off solenoid power assisted disc under the action of the spring force to close. From the guide sleeve and the main steam valve into the space between the back of the main valve, so that the main valve back pressure increased rapidly, back pressure reaches a certain value, the main valve closed. 2. Electrical devices: Electrical device is mainly composed by the controller and the operator. Controller is given control and the intermediate relays and other components. Operator controlled by two switches and three lights and other components, control switches have "Auto" position and "manual" position. Control principles of electrical devices: In automatic state, the pressure transmitter by the system pressure changes in the scale range 4-20MA output current signal: for a given device to be controlled under the pressure of the valve and the opening and closing pressure jump start the requirements for signal conversion, the control circuit After signal processing, to achieve electrical automatic control and display functions, see electrical diagram. 3. Manual gate valve: The solenoid valve is to deal with an accident and the installation of relief valve, manual valve in the actual operation should be in the fully open state, only when the electromagnetic relief valve need to open the inspection of accidents only when turned off, and use channel nut to lock the valve stem. Third, the installation instructions: 1. Safety valve at the factory after the appearance after debugging, do not allow interbank rate should be directly installed on the device, the installation location must allow enough room for the adjustment of maintenance, sockets must be of sufficient strength to withstand the exhaust valve when the generating reaction. 2. Valve centerline spacing L and the exhaust pipe shall not exceed the maximum specified value. 3. Valve silencer exit area should be sufficient discharge to prevent backpressure affect the normal operation of the valve and displacement. 4. Valve must be installed vertically. The export of valves must be equipped with proper expansion joints to prevent thermal expansion of a discharge pipe undue thermal stress relief valve, discharge tube diameter should be large than the valve outlet diameter, length as short as possible, to avoid turning. Into the tube and expansion joints should not effect the quality of the relief valve should be fixed in the buildings. Safety valve should be installed separately on each discharge pipe. 5. Valve drainage pipe must be individually set to prevent other equipment back into the hydrophobic valve, so that corrosion of parts. 6. The amount of platform safety valve should be located to facilitate maintenance and commissioning. 7. Safety valve to the entrance of the insulation should be the upper end of adjustment rod and insulation should not be so adjusted. Fourth, the electromagnetic relief device installation instructions: Electromagnetic relief valve must be installed vertically, welding should have sufficient strength to withstand discharge reaction. The upper part of the discharge pipe should be installed in expansion joints, discharge pipe should be fixed in the buildings. Centerline of the discharge pipe and valve centerline parallel to each other, the exhaust pipe and expansion joint should be installed pipes lowest point. To reduce the exhaust steam generated when the reaction torque, to try to shorten the connection to the exhaust pipe flange distance of the center line L, L should not exceed the maximum value calculated the following formula: L = 2D +50 L-valve outlet exhaust pipe flange to the centerline distance mm. D-valve outlet flange diameter mm Electromagnetic relief valve has two exhaust ports, should be separately installed exhaust pipe, exhaust pipe shall not be less than the diameter of the flange diameter exhaust valves. Electrical installations should be placed in the absence of vibration, easy maintenance and clean, dry, well ventilated, must not exceed 40 ℃ ambient temperature of the place. Pressure transmission pipe, gauge pipe diameter of 10mm or more tubes are used. Fifth, the electromagnetic and structural relief system features: 1. Main valve flap valve are used with the small thermal disc structure, rigor high. 2. Body structure made of dual exhaust, basically eliminating the valve inlet pipe joints bending stress. 3. Electric control device with pressure transmitter or pressure switch in the form of a flexible and easy to adjust, opening and closing pressure can be adjusted to 2%. 4. Can be chosen automatically turn on or remote control. Electromagnetic relief device

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