I need torque value (n/m) of industrial valve

I am looking for a Freelancer to provide me with the torque value (n/m) for an industrial valve. The specific valve is a gate valve, however the brand or model is not known. The size of the valve is more than 5 inches in diameter. I require a Freelancer who has experience and knowledge in this area, and can provide accurate values for the torque of this specific industrial valve.