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Gate valve operating torque analysis

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When the gate valve opening in more than 10%, little change of the axial force of the gate valve, gate valve operating torque. When the gate valve opening is less than 10%, due to the throttling of the fluid, the gate valve before and after increased pressure. This pressure difference at the gate, to stem the large axial force is needed to drive the gate, relatively large changes in this range, the gate valve operating torque. Flexible gate valve near the closed operating torque required to rigid gate.
China gate valve manufacture-Datian Valve, the specialist of China valve manufacture, main product range: slab gate valve, control valve, ball valve, automatic recirculation valve, gate valve, butterfly valve, globe valve, check valve, choke valve, safety valve, plug valve, diaphragm valve, strainer, pressure reducing valve and valve products.

The gate is closed, due to the sealing of the sealing surface in different ways, will have different situations. The self-sealing valve (including flat valve), the valve is closed, the sealing surface of the gate exactly is the seat sealing surface, that is, the gate valve fully open position. But this position in the gate valve operating conditions can not be monitored, when in actual use, is the gate valve off to the ending point of location as a gate valve fully closed position. Thus, self-sealing of the valve is fully closed position to determine the location of the gate (ie, travel). Must be made mandatory sealing of the valve, close the gate to exert pressure to the valve seat. This pressure can guarantee strict sealing surface between the gate and seat seal is mandatory sealing gate valve sealing force. The sealing force will continue to do the stem nut self-locking. Obviously, in order to provide the sealing force to the gate, the transmission torque of the stem nut torque valve operation. Thus, the mandatory sealing of the valve fully closed position to determine the torque on the size of the stem nut.

Valve closed, due to the media or changes in ambient temperature, the pressure between the gate and the seat of the gate valve components of thermal expansion makes larger, reflecting on the stem nut, difficult to again open the gate valve . Therefore, the torque required to open the gate valve larger than the torque required to close the gate valve In addition, for a pair of contact between the sealing surface, the coefficient of static friction between them is also larger than the coefficient of kinetic friction to them from the stationary state relative motion, the need to exert greater force to overcome the static friction; due to temperature changes, the pressure between the sealing surface is larger, the need to overcome the static friction become larger, and so open the gate valve, the stem nut applied torque can sometimes increase. Gate valve torque reference table Nominal diameter (mm) Nominal pressure (MPa)

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Ridge – Rubio, Minnesota Rubio is a different kind of rookie,
against the Bulls once again proved that he is unique and his
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Rubio. Chandler – Parsons, rocket This second-round rookie Parsons,
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desire Parsons on the personal attack is not so strong, However,
the team with the better performance on the Rockets came to be in
the latter half of last season playing the best league in offensive
efficiency, it is because the players on the offensive timing to do
well, in this respect, Parsons has more than of Budinger. Iman –
Mountain Mu Pote, New York 21-year-old Shan Mu Pote, the physical
is not inferior to any of their predecessors, the power of the
defender he is a challenge, and the mountain Mu Pote body control
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offensive end in. Nicola – Wuqieweiqi, 76 Data, Wuqieweiqi to
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