Generally speaking, the operator should be able to lift objects of the same weight as his own, so he can budget a large marginal pull.For example, a 175-pound person should be able to manipulate an operating organization with a marginal pull of 175 pounds.In order to prevent excessive fatigue and damage to the operator, the marginal pull force is usually far less than 175 pounds.

   The need for lower marginal pull often results in the need for bevel gear operating organizations equipped with high gear ratios.Because the number of turns of the valve is increased when the valve is operated, then the operation is added at all times.Pay attention to this when determining the large marginal pull.

   The operation of the pneumatic wrench increases the cycle speed of the high gear ratio bevel gear equipment, but the mechanical gain of the bevel gear enables the operator to damage the valve.Valves without seat or back seat use pneumatic wrench; manual valve seat and back seat valve operation should be careful, especially after the bevel gear operating organization is equipped.