The pressure regulator is a regulating device that reduces high-pressure gas to low-pressure gas and keeps the pressure and flow of the output gas stable. It is a consumable product and a necessary and common component in the gas pipeline system. Due to product quality problems and using frequent The cause of wear will cause leakage in the valve body. Below, the manufacturer of AFK pressure reducer from Wofly Technology will explain the reasons and solutions for the internal leakage of the pressure regulator.
Reasons for internal leakage of the valve: the valve is opened by air, the valve stem is too long and the valve stem is too short, and the upward (or downward) distance of the valve stem is not enough, resulting in a gap between the valve core and the valve seat, which can not fully contact, resulting in closing Lax and internal leakage.
Solutions:
1. The valve stem of the regulating valve should be shortened (or lengthened) so that the length of the stem is appropriate so that it does not leak internally.
2. Reasons for packing leakage:
(1) The packing is in close contact with the valve stem after being loaded into the stuffing box, but this contact is not very uniform, some parts are loose, some parts are tight, and some parts are not even.
(2) There is relative movement between the valve stem and the packing. With the influence of high temperature, high pressure and strong permeability medium, the packing will leak.
(3) Packing contact pressure gradually attenuates, packing itself and other reasons, the medium will leak from the gap.
Solutions:
(a) In order to facilitate the packing of the packing, chamfer the top of the stuffing box, and place an erosion-resistant metal protection ring with a small gap at the bottom of the stuffing box to prevent the packing from being washed by the medium.
(b) The contact surface of the stuffing box and the packing should be smooth to reduce packing wear.
(c) Flexible graphite is selected as the filler, which has the characteristics of good air tightness, small friction, small deformation, and no change in friction after re-tightening.
3. The valve core and core seat of the regulating valve are deformed and leaked. The main reason for the leakage of the valve core and valve seat is that the casting or casting defects in the production process of the control valve can lead to increased corrosion. The passage of corrosive media and the erosion of the fluid medium will cause erosion and erosion of the valve core and valve seat materials. The impact causes the valve core and valve seat to deform (or wear) out of matching, leaving gaps and leaking. Solution: Choose corrosion-resistant material for valve core and valve seat. If the abrasion and deformation are not serious, fine sandpaper can be used to grind to eliminate traces and improve smoothness. If the deformation is severe, only replace the valve core and valve seat.
Post time: Mar-04-2021