Ming pole valve and the dark rod gate valve main difference:
1, the dark rod valve lifting screw is only rotating without moving up and down, exposing only a rod, the nut is fixed on the gate, through the screw rotation to improve the gate, there is no visible gantry; Ming Rod gate valve lifting screw is exposed, the nut close to the hand wheel and is fixed (no rotation nor axial movement), by rotating the screw to lift the ram, screw and ram relative rotation without relative movement of the shaft To the displacement, the appearance of a door-shaped bracket.
2, dark rod gate valve can not see the screw, and Ming rod can see the screw.
3, the dark bar valve in the steering wheel and the valve stem is connected with the relative motionless, it is through the valve stem at a fixed point to move the valve to promote upward and gate to complete the opening and closing. Ming rod valve is through the stem and steering wheel thread drive to raise or lower the valve. Said that the simple point is the rod valve is the valve stem together with the valve up and down movement, the steering wheel is always at a fixed point.
Gate valve according to the structure of the valve stem can be divided into: 1, open rod valve: open rod valve: stem nut in the valve cover or bracket, open the gate, the use of rotating stem nut to achieve stem lifting. This structure is beneficial to the lubrication of the valve stem, opening and closing a clear degree, it is widely used. Trapezoidal thread is usually on the lifting rod, through the valve at the top of the nut and the guide groove on the valve body, the rotary motion into a linear motion, that is, the operating torque into the thrust. Ming rod valve opening and closing pieces is the gate, the direction of movement of the gate and fluid perpendicular to the vertical rod gate valve can only be fully open and fully closed, can not be adjusted and throttling. 2, dark bar gate valve: dark bar gate valve, also known as rotary rod valve (also known as dark bar wedge gate valve). Stem nut in the body, in direct contact with the medium. Open and close the gate, the rotary valve stem to achieve. Dark bar gate valve opening and closing pieces is the gate, gate direction of motion and fluid perpendicular to the gate valve can only be fully open and fully closed, can not be adjusted and throttling. The valve stem nut is arranged on the gate plate, the hand wheel rotates to drive the valve rod to rotate, and the gate plate is lifted. Usually, there is a trapezoidal thread at the bottom of the valve stem. Through the thread at the bottom of the valve and the guide groove on the valve disc, Into a linear motion, that is, the operating torque into the thrust. Xiao Wenkai Mobile: Landline: QQ: Mobile 2:
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