Slurry tanker gate valve not closing

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 12, 2023

• #1

Have a problem with a gate valve sticking with a teaspoon full of silage, then the tanker can't fill because it is drawing air through it. Happens about 3 times a day. Why does the manual valve that I fill through never stick, but the hydraulic one is a torture

 

N

N.Yorks.

Member

• Oct 12, 2023

• #2

Depends whether the hydraulic valve has a cutting edge along the bottom edge of the gate that's controlled by the hydraulic ram. Some are designed to cut through any soft obstruction.......
Are your two valves identical?

 

organic antares

Member

Mixed Farmer

Location

cheshire

• Oct 12, 2023

• #3

Our tanker gets bits in the valve like that, we just open and close the valve while it's filling, sucks the bits back into the tank and seals ok

 

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 12, 2023

• #4

organic antares said:

Our tanker gets bits in the valve like that, we just open and close the valve while it's filling, sucks the bits back into the tank and seals ok

Click to expand...

This one won't, was wondering about sharpening the lollipop thing like a knife edge and it that doesn't work try a double acting ram

 

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 12, 2023

• #5

N.Yorks. said:

Depends whether the hydraulic valve has a cutting edge along the bottom edge of the gate that's controlled by the hydraulic ram. Some are designed to cut through any soft obstruction.......
Are your two valves identical?

Click to expand...

It hasn't a cutting edge, it would be around 4 mm at the tip

 

Nukemall

Member

• Oct 12, 2023

• #6

Have you checked the groove that the valve slides in to, I had a small piece of flint in there that stopped the valve shutting fully, and that allows just a small piece of debris to cause a problem as it stops the chopping effect of the valve.

 

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 12, 2023

• #7

Nukemall said:

Have you checked the groove that the valve slides in to, I had a small piece of flint in there that stopped the valve shutting fully, and that allows just a small piece of debris to cause a problem as it stops the chopping effect of the valve.

Click to expand...

Yes, I have to clean it out every 5 or 6 load , maybe I have a faulty valve, it was new in june

 

daveydiesel1

Member

Livestock Farmer

Location

Co antrim

• Oct 12, 2023

• #8

Have you tried increasing the spring pressure?

 

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 12, 2023

• #9

daveydiesel1 said:

Have you tried increasing the spring pressure?

Click to expand...

It's at the end of it's tether! Only half of the nut clinging on

 

Stewart97

Member

• Oct 12, 2023

• #10

ridger said:

It's at the end of it's tether! Only half of the nut clinging on

Click to expand...

To tighten the spring up would you not have to turn the opposite way to compress the spring ?

 

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 12, 2023

• #11

Stewart97 said:

To tighten the spring up would you not have to turn the opposite way to compress the spring ?

Click to expand...

No, it's a pull spring.

 

Stewart97

Member

• Oct 12, 2023

• #12

ridger said:

No, it's a pull spring.

Click to expand...

So its different from your normal lollipop valve on the back of the tanker ?

 

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 12, 2023

• #13

Stewart97 said:

So its different from your normal lollipop valve on the back of the tanker ?

Click to expand...

Mine are all pull springs

 

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 12, 2023

• #14

Don't see how a compression spring would work, you'd need a tube over the spring to give it something to push against I suppose?

 

S

Sheep

Member

Location

Northern Ireland

• Oct 12, 2023

• #15

I have to do it occasionally if I'm on thick stuff/end of tanks.

Take it apart and see if theres anything obvious wrong?

Is this on the splash plate?

 

Cowabunga

Member

Location

Ceredigion,Wales

• Oct 12, 2023

• #16

The flat lollipop valves tend to accumulate hard packed fibre at the top of the lollipop. This inhibits movement and requires the occasional removal of the top part by separating at the flange. Then you need to poke the hard packed rubbish out with a long screwdriver or something.
Otherwise change the whole top of the valve out for a bell type which never blocks because they self clean. It depends how much you value your time and sanity as to whether you think it worth the cost.
If you already have a bell shaped valve then I can only suggest you extend the return spring to exert more downward pressure on the valve and if that fails, separate the top and bottom and check that the lollipop or its top attachment point is worn excessively, allowing the lollipop to tilt.

 

A

acorn

Member

Livestock Farmer

Location

Lancashire, Home of the Deluge

• Oct 13, 2023

• #17

∆∆. This. ∆∆

 

ridger

Member

Location

Tyrone, Northern Ireland

• Oct 13, 2023

• #18

Cowabunga said:

The flat lollipop valves tend to accumulate hard packed fibre at the top of the lollipop. This inhibits movement and requires the occasional removal of the top part by separating at the flange. Then you need to poke the hard packed rubbish out with a long screwdriver or something.
Otherwise change the whole top of the valve out for a bell type which never blocks because they self clean. It depends how much you value your time and sanity as to whether you think it worth the cost.
If you already have a bell shaped valve then I can only suggest you extend the return spring to exert more downward pressure on the valve and if that fails, separate the top and bottom and check that the lollipop or its top attachment point is worn excessively, allowing the lollipop to tilt.

Click to expand...

The thing is, this was a brand new valve, put on in June this year. It must be faulty?

 

Cowabunga

Member

Location

Ceredigion,Wales

• Oct 13, 2023

• #19

ridger said:

The thing is, this was a brand new valve, put on in June this year. It must be faulty?

Click to expand...

Check the points mentioned to isolate the fault.

 

Stewart97

Member

• Oct 13, 2023

• #20

ridger said:

Mine are all pull springs

Click to expand...

Aw yes okay thats why mins all compression springs with out a tube