A walking support and a horizontally moving oil cylinder are arranged under the main body of the gantry. Inverted arch side templates are arranged on both sides of the main body of the gantry, so that the gantry can move back and forth, left and right. The tunnel inverted arch self-propelled frame has a simple structure, low cost, and low failure rate. While ensuring vehicle traffic, inverted arch construction can be carried out, which can effectively ensure the construction speed of the tunnel and effectively reduce construction accidents.
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Regulatory features "It is used in conjunction with the valve positioner to achieve proportional adjustment; Switch type features" and the two-position five-way solenoid valve and control box supporting the use of switch control. V-shaped ball valve is designed with a special shape of V-notch, with accurate closure properties and control functions for a variety of control applications, compact structure, small size, can be installed close to the advantages. Suitable for the control of gas, liquid, solid granular media. Because of the backlash-free rotation between the valve core and the valve seat, it has a large shear force and self-cleaning performance, and is particularly suitable for the control of suspensions and solid particulates containing fibrous or minute solid particles. Therefore, this product can be widely used in petroleum, chemical, paper, chemical fiber, power, metallurgy, pharmaceutical, environmental protection and other industrial sectors of the automatic control system.
Three Fine Pneumatic V Type Ball Valves" Features
1. Pneumatic V-ball valve consists of V-shaped valve body, pneumatic actuator and other accessories. It is a high-grade control valve with a right-angled rotary structure. The V-ball valve needs no repair for a long time and has a long service life. It provides you with a truly high-efficiency valve for controlling process conditions.
2. Excellent adjustment characteristics: V-valve has an approximately equal percentage of inherent flow characteristics and an adjustable ratio of up to 300:1. Therefore, the V-valve can provide precise control over a wide range of variations.
3, the maximum flow volume: due to its streamlined shape and full right angle rotation control, so that the maximum volume is particularly high, the ability to pass particularly large, flow resistance is small, so you can use a smaller and more economical and practical valve size.
4. V-valve adopts double bearing structure, high mechanical stability and small starting torque, which ensures the valve has excellent sensitivity and induction speed.
5. Maximum reliability (safety): The valve body is an integral structure that is sturdy and durable. The operation is not affected by the pressure of the pipeline and the leakage of the valve body can be avoided.
6, the superior sealing of the metal seat: V-valve using movable metal seat, with the help of compensation function, and has superior sealing performance and long service life. In the flow direction, the leakage amount is 10 rated flow coefficient.
7. Super shearing ability: V-valve adopts metal hard seal structure, V-shaped valve core and metal seat in the process of rotation, V-notch and valve seat generate a strong shear force can cut off fiber and other impurities , And with self-cleaning function, to avoid valve stuck phenomenon.
8. Pneumatic V-ball valve is compact, compact and light, easy to install and easy to maintain.
9. Pneumatic actuator adopts piston type cylinder and crank arm conversion structure, which has large output torque and small volume. The actuator adopts a sealed waterproof design with a high degree of protection. The cylinder block adopts imported mirror cylinder, no oil lubrication, small coefficient of friction, corrosion resistance, superior durability and reliability. All transmission bearings use boundary self-lubricating bearings without oil lubrication to ensure that the drive shaft does not wear.
The working principle of regulating ball valve
Pneumatic V-adjusting ball valve belongs to angular stroke regulating valve. It is composed of GT/AT/AW pneumatic actuator and stainless steel V-ball valve with 4-20mA intelligent valve positioner. It can be adjusted and used by accessing DCS control system. Pipeline flow regulation can be easily controlled at the office.