What maximum torque can an adult apply to turn a valve?

Everyone has different levels of strength; generally, a value of no more than 350 Nm is specified. If that value is exceeded, a worm gear transmission is usually used

According to the valve standards, the maximum opening and closing torque shall not exceed 360 N. In this case, the opening torque value of the ball valve is calculated, and dividing it by the length of the extension rod yields the operating torque.

The design of the stop valve handwheel is based on a torque range of 150 Nm to 180 Nm.

360N is the limit specified for manual valves; when a force greater than this value is required, an actuator should be used. What I want to do is to find a simple way of calculating the torque in situations where there is no torque wrench available and the valve’s torque exceeds 360N. It seems that 360N refers to the pulling force that an adult can exert with one hand. If I use a 2-meter long lever and hold it with both hands, pressing down on it from above with explosive force, then… It should be more than 360N. Yesterday I conducted an experiment: I hung an electronic scale hook on a trolley, and then one person held onto the hook of the scale while pulling downward with explosive force, without lifting the body off the ground. Depending on individual differences, the explosive force generated by each person ranged from about 42 to 58 KG. Therefore, I decided to use the average value, which is 50 KG as the ultimate explosive force – equivalent to 500 N. This was done without using any leverage; is such an experiment valid? Additionally, the opening torque of a ball valve should be calculated as the torque when the valve is unloaded; it is the torque exerted by the valve seat on the ball valve. Additionally, the torque resulting from the pre-tensioning of the packing must also be taken into account. Does this company have a simple method for calculating this?

360N is the limit specified for manual valves; when a force greater than this value is required, an actuator should be used. What I want to do is to find a simple way of calculating the torque in situations where there is no torque wrench available and the valve’s torque exceeds 360N. It seems that 360N refers to the pulling force that an adult can exert with one hand. If I use a 2-meter long lever and hold it with both hands, pressing down on it from above with explosive force, then… It should be more than 360N. Yesterday I conducted an experiment: I hung an electronic scale hook on a trolley, and then one person held onto the hook of the scale while pulling downward with explosive force, without lifting the body off the ground. Depending on individual differences, the explosive force generated by each person ranged from about 42 to 58 KG. Therefore, I decided to use the average value, which is 50 KG as the ultimate explosive force – equivalent to 500 N. This was done without using any leverage; is such an experiment valid? Additionally, the opening torque of a ball valve should be calculated as the torque when the valve is unloaded; it is the torque exerted by the valve seat on the ball valve. Additionally, the torque resulting from the pre-tensioning of the packing must also be taken into account. Does this company have a simple method for calculating this?

These are the requirements regarding operating torque in the API

Thank you. This is the standard when designing handles. What I’m trying to do is to measure the torque required to operate large-diameter valves with no load, in the absence of a torque wrench; I use a 2-meter lever to apply force, so as to determine how much torque is needed to operate the valve without any load

On average, a person can lift a weight equal to their own body weight; this is something that normal people are capable of doing! For those who exercise regularly, they can lift weights that are 15%~30% heavier than their body weight ； If one doesn’t exercise much and doesn’t do heavy work, they will lack strength. Boys should be able to lift at least 60% of their own body weight, while girls can lift less People who have undergone special training are able to lift weights of 200 to 400 pounds.