Description
Motorized Forged Globe Valve Dn60 Pn25, also called the shut-off valve, is the most widely used valve, mainly composed of a valve body, a valve disc, a valve bonnet, a valve stem, etc. The valve body and valve bonnet are pressure-bearing parts, and the valve disc and valve stem are internal parts. The globe valve is a valve in which the closing part (valve disc) moves along the center line of the valve seat. According to this movement of the valve disc, the change of the valve seat opening is directly proportional to the valve disc stroke.
Overview
With more than ten years of mature thermal control engineering experience in the power industry, Freya has made a lot of targeted improvements based on the actual application of similar products, and successfully launched a new generation of intelligent integrated electric actuators, which integrates bus control technology, absolute encoder technology, infrared remote control technology, LCD display, magnetic switch control, cover-free and other latest automatic control technologies. FRY series intelligent electric actuators are guaranteed by internationally advanced and mature technology, first-class processing equipment and a complete service system. It has been proven by the use of the majority of users: advanced and powerful functions, stable and reliable performance, safe and convenient use, fully reaching the international advanced level, and are ideal substitutes for imported electric actuators. Products are widely used in power, petroleum, papermaking, chemical industry, steel, cement, water treatment and other fields.
Principle of globe valve
The principle of the globe valve is to use the torsion of the valve stem to give the sealing surface a downward pressure, and rely on the pressure of the valve rod to make the valve disc sealing surface fit closely with the valve seat sealing surface to prevent the inflow of the medium or to adjust the flow rate of the medium. The opening and closing part of the globe valve is a cylindrical valve disc, the sealing surface is a plane or a cone, and the valve disc moves linearly along the center line of the fluid. The movement of the valve stem includes a lifting stem type (the valve stem rises and falls, and the handwheel does not rise and fall), and a lifting and rotating stem type (the handwheel rotates and rises and falls with the valve stem, and the nut is set on the valve body). The globe valve is a forced sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage.
Intelligent electric actuator
FRY series intelligent electric actuators are backed by internationally advanced and mature technology, first-class processing equipment and a complete service system. They have been proven by the vast number of users to have advanced and powerful functions, stable and reliable performance, safe and convenient use, and fully meet the international advanced level. They are ideal substitutes for imported electric actuators and are widely used in the fields of electricity, petroleum, papermaking, chemical industry, steel, cement, water treatment, etc.
Structure form
Right angle
The right-angle fluid only needs to change direction once, so the pressure drop through this valve is smaller than that of a conventional globe valve. The valve body is mostly forged and is suitable for globe valves with smaller diameters and higher pressures.
Straight-through
The straight-through type is the most common structure, with the media inlet and outlet channels being 180° in the same direction, but its fluid resistance is the greatest.
Performance features
The high-quality aluminum alloy shell is exquisite and lightweight, coated with a layer of protective material to adapt to extremely harsh environments, and other types of layers can be added as needed.
The low inertia, high torque motor allows the motor to quickly reach peak torque after starting, and there is almost no overrun when not excited. A precise temperature switch is embedded in the motor coil, which is not affected by the ambient temperature, keeping the motor in the optimal thermal capacity.
Absolute coding technology
■ The absolute encoder used in the electric actuator can operate continuously and is 100% repeatable. It can provide accurate position signals to the processor even without power or battery power.
■ Single-turn uses 12-bit counting with an accuracy of 0.08
■ Multi-turn uses 6-level gear counting, which can reach 4096 turns (the count value is unique in the 4096 rotations of the drive sleeve)
■ The redundant circuit of the encoder can ensure normal operation even if 50% of the components fail
Electronic torque detection
■ The cut-off torque can be set bidirectionally (forward/reverse) independently in steps of 1%.
■ The electronic torque detection device includes an effective power detection circuit, a motor angular velocity detection circuit, a control circuit and a CPU microprocessor. During operation, the microprocessor continuously detects the effective power and angular velocity of the motor and calculates the actual torque and compares it with the preset cut-off torque. Once it exceeds the limit, the CPU immediately cuts off the motor power supply and outputs a fault alarm message to achieve over-torque protection. The actuator motor will not burn out due to stalling, and the valve will not be damaged due to over-torque of the actuator.
■ Non-contact torque detection, no mechanical torque switch is required, no mechanical wear, and long service life.
■ The output torque can be simply and quickly set using an infrared setter without opening the cover.
■ It is not affected by factors such as temperature and voltage fluctuations, has high accuracy, and can fully meet the reliable protection of on-site valves.
