Fully Open Safety Valve with Handle Spring

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Full-open safety valve with handle spring is suitable for equipment or pipeline with medium such as …

Productoverview:
A28H/Y With a safety valve spring handle Suitable for the work temperature are less than 200 of the air, steam, water, nitrogen and hydrogen mixed gas medium of the equipment or pipeline, A28Y-P/10R8 is suitable for the work temperature are less than 200 corrosion of the equipment or pipeline, as the overpressure protection device.
Two, With a safety valve spring handle Opening pressure adjustment:
1, safety valve factory, setting value by Taiwan to adjust the opening pressure to the user requirements. If the user make the spring working pressure level, according to the general level of pressure according to the lower limit value of the adjustment of the factory.
2, users will be protected safety valve installed on the device before or during installation, must be re adjusted at the installation site to ensure safety valve set pressure value to meet the requirements.
3, in the plate spring working pressure level within China valve by rotating the adjustment screw to change the amount of spring compression, you can adjust the pressure on the opening.
4, in the rotation adjustment screw until the valve inlet pressure should be reduced to 90% below the opening pressure, to prevent the rotation adjustment screw when the valve is driven to rotate, so that the sealing surface damage.
5, in order to ensure the accurate value of opening pressure, should make adjustments in the medium conditions, such as medium type, temperature as close as possible the actual operating conditions. Media types to change, especially when the state media did not accumulate at the same time (e.g. from liquid to vapor), open the pressure changes often. When the temperature increases, the opening pressure is generally decreased. It is adjusted at room temperature for high temperature, room temperature setting of the pressure value should be slightly higher than the required opening pressure value. To what extent the high structural and material selection and the valve has a relationship should be based on the manufacturer's instructions.
6, the conventional safety valve for a fixed additional back pressure of the occasion, when adjusting the opening pressure after examination (the pressure as the atmospheric pressure), the setting value should be value minus the value of additional back pressure pressure is required to open.
Three, With a safety valve spring handle Common faults and eliminate method:
1, after discharge valve back seat. This is mainly spring bending stem, valve installation position is not correct or stuck by. Should be re assembled.
2, leakage. Under normal working pressure in the equipment, valves and valve seat sealing surface between the leakage exceeds the allowable level. The reasons are: the dirt between the valve and valve seat sealing surface. Wrench can be used to enhance the valve to open several times, the dirt washed out; sealing surface damage. According to the extent of the damage, by grinding or polishing methods after turning to repair; stem bending, tilting or deflection lever and fulcrum, the spool and the valve flap dislocation. Should be re assembled or replaced; three valve spring elasticity or lose. Should be taken to replace the spring, re adjust the opening pressure and other measures.
Don't open the 3, to the required pressure. The reason for this situation is the constant pressure are not allowed. The amount of compression or the position of the hammer should re adjust the spring; the valve stuck valve and valve seat. It should be regular or manual air discharge test of safety valve; lever type safety valve lever is stuck or the hammer is moved. Should re adjust the position of the heavy hammer and the lever moves freely.
4, exhaust pressure continues to rise. This is mainly because the safety valve displacement with Xiaoping equipment safety discharge, should be re select the appropriate safety valve; the valve stem rust midline or spring, so that the valve can not open to a certain height, the stem should be re assembled or replace the spring; exhaust pipe section has not, should be taken to meet the safety area of the exhaust emissions tube.
5, valve frequency hopping or vibration. Is mainly due to stiffness of the spring too. Should use the appropriate spring stiffness; adjustment ring to adjust properly, the back seat pressure too high. Should re adjust the position of adjusting ring; discharge pipe resistance is too large, resulting in excessive emissions of back pressure. We should reduce the discharge pipe resistance.
6, less than the required opening pressure. Mainly constant pressure allowed; spring stretch down aging. Tighten the screws should be properly adjusted or replace the spring.
Four, A28H A28Y With a safety valve spring handle The main components of materials:

Five, A28H A28Y With a safety valve spring handle Dimensions and connection dimensions:

Sixth, notice: if you A28H A28Y with a handle spring full open safety valve interested please consult or order according to the following requirements.
1, the safety valve product name and model of safety valve safety valve with the attachment so that we use for temperature and medium pressure using the safety valve and safety valve of your selection
2, if has the safety valve type design units selected Zhongwei company, please press the model directly to our sales department order.
3, the occasion is very important when using more complex or the environment when you try to provide design drawings and detailed parameters by our Zhongwei Control Engineer audit checks for you.