How to maintain PTFE lined butterfly valve?

Failures are the most common questions that plant personnel ask when it comes to issues on PTFE lined butterfly valves. We know how frustrating they are when you come across a problem like this, especially if PTFE lined butterfly valve is a newly purchased item and you’d expect the best from it. Don’t panic when this is your case, as some PTFE lined butterfly valve issues can be easily solved due to their simple geometry and design. However, some leakage problems would require complete valve overhaul so be mindful that not cases are the same.

Why does PTFE lined butterfly valve leak?

How to maintain PTFE lined butterfly valve?

How to fix a leaking PTFE lined butterfly valve?

Why does PTFE lined butterfly valve leak?

PTFE lined butterfly valves are commonly used as a shutoff valve and flow control valves. As a shutoff valve, PTFE lined butterfly valve is to block the passage of fluid in its closed position and prevent any sort of leakages. Not only should PTFE lined butterfly valve efficiently seal the pipe and the flange to prevent internal leakages within the piping system, but also eliminate fugitive leakages escape from the valve to the atmosphere.

There are many reasons why PTFE lined butterfly valves leak. This can be one of the following:

l PTFE lined butterfly valve seat are covered in dirt or the valve stem and disk is rusted.

l PTFE lined butterfly valve seat is scored.

l PTFE lined butterfly valve’s seal is damaged.

There is insufficient actuator movement in the PTFE lined butterfly valve.

Also, there are common causes of leakage to atmosphere. PTFE lined butterfly valve stem packing is worn. Gasket between PTFE lined butterfly valve body and bonnet is damaged.

How to maintain PTFE lined butterfly valve?

At first, check whether the lubricator of PTFE lined butterfly valve is working properly and whether the viscosity of the lubricating oil is appropriate. If necessary, you can choose to replace the lubricating oil, clean the sliding part of the PTFE lined butterfly valve, and replace the spring.

Then we need to replace the sealing ring, valve stem and valve seat of PTFE lined butterfly valve in time.

Before checking the working circuit of PTFE lined butterfly valve for faults, we should first turn the manual knob of the PTFE lined butterfly valve a few times to see whether the PTFE lined butterfly valve can achieve normal reversing under the rated air pressure. If it can change normally, the problem is that the circuit is faulty. During the inspection, the voltage of the electromagnetic coil can be measured with instrument technology to see if PTFE lined butterfly valve has reached the basic rated output voltage. If the voltage level is not too low, the power supply and the associated travel switch design circuit in the risk control module circuit should be further improved.

How to fix a leaking PTFE lined butterfly valve?

Before you figure out how to fix a leaking PTFE lined butterfly valve, you must first analyze the following questions. This is so you can think about if fixing the leakage is even significant or would just cost you unnecessarily huge expenses that is not really worth it.

l Does the set leakage tolerance of the PTFE lined butterfly valve been exceeded? Metal seated PTFE lined butterfly valves have allowable‌ ‌leakage rates under FCI 70-2 (Class VI).

l Does PTFE lined butterfly valve operate at the correct pressure and temperature as stated by the manufacturer?

l Are you using the right type of PTFE lined butterfly valve?

l Do you regularly have maintenance schedules for checking the PTFE lined butterfly valve body, stem and seat?

l Is the orientation of the PTFE lined butterfly valve preferable for that valve?

There is no guarantee that one problem can be addressed with a generalized solution, but here, we present the most common problems with a few remedies you can do to solve the problem.

l Clean the packing bore of PTFE lined butterfly valve, or even replace it if necessary.

l Apply grease in the actuator of PTFE lined butterfly valve. Clean and remove the seat and stem. Apply thread locker or Loctite before tightening the bolts.

l Try using an air pipe to directly blow in air in the pneumatic actuator of PTFE lined butterfly valve to see if it works normally.

l Initiate maintenance of the components of PTFE lined butterfly valve.

l Check the power source; replace burnt or damaged fuse; reset the system.

l Check whether the actuator closes at maximum torque, open or close the valve under pressure and increase torque.

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