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brass replacement stem for two knob bath tub valve

author:MF manufacturerstime:2022-03-16 12:31:39

brass replacement stem for two knob bath tub valve

Some of the problems often encountered during assembly are::Stem rotation is not flexible,even stuck;Leakage at the packing during pump inspection after installation,Sealing surface leaks,There is also leakage at the connection between the valve body and the bonnet;Disc and bonnet interfere;The valve is not closed tightly, etc.。Some problems are easy to solve,Some issues are due to ill-consideration,Often difficult to solve。

brass replacement stem for two knob bath tub valve

1、The valve stem does not rotate flexibly or is stuck. The reasons for the inflexible or stuck valve stem are generally as follows.:

(brass replacement stem for two knob bath tub valve)reason:

①Packing too tight

②Packing is out of specification

③The valve stem and the valve stem bushing are of the same material or improperly selected

④Insufficient clearance between valve stem and gland

⑤The valve stem is bent

⑥Unsatisfactory thread surface roughness。

measure:

①Properly loosen the packing gland nuts

②Pack stuffing into stuffing box according to specification(The packing ring should be layered when placing the packing。The seams of each layer of packing rings should be staggered from each other120°,When pressing the packing, the valve stem should be properly turned,in order to check the rotational flexibility of the valve stem。)

③using different materials。Brass optional、bronze、Carbon steel or stainless steel as valve bushing material

④Consider whether the stem and gland meet the drawing requirements。Undesirable replacement

⑤Straighten the valve stem

⑥The surface roughness of the thread should meet the requirements of the drawings

brass replacement stem for two knob bath tub valve

2、Sealing surface leakage The main reasons for sealing surface leakage are as follows::

reason:

①Damaged sealing surface(as indentation、bruises、disconnection, etc.)

②Dirt adheres between the sealing surfaces

③The sealing ring and the gate are not tightly matched

measure:

①Finish the sealing surface,If the damage is serious, the sealing surface should be replaced again

②Rinse off the dirt adhering to the sealing surface

③Grind the sealing ring and the gate separately

(brass replacement stem for two knob bath tub valve)brass replacement stem for two knob bath tub valve

3、Leakage at the packing The reasons for the leakage at the packing are as follows::

reason:

①Packing gland is not tight

②Not enough filler

③Poor storage and failure of packing

(brass replacement stem for two knob bath tub valve)④Fill the whole packing in the stuffing box

⑤Types of fillers、Structural size and quality are not satisfactory

⑥Out of tolerance valve stem roundness,scratched、Defects such as scribe lines and bruises measure:

①Press the packing gland evenly against the packing

②add filler

③Replace the packing

④Fill the stuffing the right way

⑤Choose the one that meets the requirements,Packing matched with valve stem

⑥Trim or replace the valve stem

brass replacement stem for two knob bath tub valve(brass replacement stem for two knob bath tub valve)

4、When there is leakage at the connection between the valve body and the bonnet, the condition of the flange connection should be checked first.。

If the bolts at the flange connection are not uniformly tightened, the flange is inclined,Or the tightening force of the tightening bolts is not enough.,properly tighten the bolts。Be careful when tightening,loosen first and then tighten,not in one step,Otherwise, the gasket will be pressed unevenly,And take the order of front, back, left and right into a cross shape to tighten。If this measure still does not completely solve the problem,The following reasons should be considered:The connection surface between the valve body and the bonnet is damaged,Damaged or non-compliant gaskets,Flange joint surfaces are not parallel,Poor processing of flange sealing surface,Poor threading of the valve seat and valve stem makes the valve seat inclined。to this,countermeasures must be taken to eliminate。 reason:

①Uneven tightening of connecting bolts

(brass replacement stem for two knob bath tub valve)②The connection surface between the valve body and the bonnet is damaged

(brass replacement stem for two knob bath tub valve)③Damaged or non-compliant gaskets

④Tilt of the valve seat due to poor threading of the valve seat and valve body

(brass replacement stem for two knob bath tub valve)⑤Poor processing of flange sealing surface

(brass replacement stem for two knob bath tub valve)⑥The joint faces of the flanges are not parallel measure:

①Tighten the bolts evenly

(brass replacement stem for two knob bath tub valve)②Repair damaged surface

③Replace the gasket

(brass replacement stem for two knob bath tub valve)④If it cannot be remedied,should be replaced

⑤Trim flange sealing surface

⑥be trimmed

brass replacement stem for two knob bath tub valve

5、There is interference between the gate and the bonnet when the gate valve is opened to the fully open state,Sometimes the gate cannot be fully opened,There is interference between the gate and the bonnet。

At this time, the valve cover can be turned180°。If the problem cannot be solved, the gate must be trimmed to eliminate its interference。

reason:Poor processing of gate

measure:Trim the gate to meet the requirements

6、The gate does not close tightly when this happens,First check whether the gate is closed to the predetermined position。

if not,Turn the valve stem properly,After opening the gate a few turns,close again。Cycle back and forth several times,and appropriately increase the closing force。If still can't solve the problem,The valve must be disassembled for a comprehensive inspection。Check whether there is debris falling between the valve seat and the gate,if any,to be cleared;in addition,Poor processing or damage to the surface of the valve sealing ring can also cause the gate to not close tightly,to this,Seals must be ground or replaced。 reason:

①The valve is not closed to the predetermined position

②There is debris between the valve seat and the gate

③The valve sealing ring is not well processed measure:

(brass replacement stem for two knob bath tub valve)①The valve stem should be turned properly,make it close to the predetermined position

②clean up the clutter

③Trim or replace the seal

brass replacement stem for two knob bath tub valve

More information,Collected by Renren Valve according to the relevant knowledge of the valve industry,Hope it can be helpful to you friends。

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