Cement Silo Parts for Concrete Batching Plants
Silo safety valves, butterfly valves, rotary feeders, level indicators, aeration pads, dust collector filter bags.
Cement Silo Parts for Concrete Batching Plants
Quality replacement parts with factory-direct pricing. Contact us for a complete list.
Available Cement Silo Parts
| Part Name | Common Material | Specifications |
|---|---|---|
| Silo Safety Valves | Pressure relief, spring loaded | For 50-200t silos |
| High/Low Level Indicators | Rotary paddle / diaphragm | Standard flange |
| Silo Discharge Valves | Butterfly / slide gate | DN200 – DN400 |
| Aeration Pads | Ceramic / fabric | For fluidized discharge |
| Dust Collectors | Cartridge / bag type | For silo vents |
How to Order the Right Parts
To ensure the correct fit, please provide us with:
- Your mixer / plant model (e.g. HZS120, JS2000)
- The part name and quantity needed
- Photos or drawings of the worn part (if available)
- Your plant's serial number or year of manufacture
Need a quote? Send us your plant model and part list — we respond within 4 hours with specifications, material options and factory pricing. WhatsApp: +86 187 6888 8850
What the Same Silo Part Is Called
The cement silo is the part of a batching plant where terminology varies most by country and by supplier. Before you order, check the name you are using against this list — it is the most common reason buyers order the wrong part.
| You may call it | We call it | Also known as |
|---|---|---|
| Silo safety valve | Pressure relief valve | Silo top valve, explosion vent, breather valve |
| Level indicator | High / low level indicator | Silo level sensor, rotary paddle, level switch |
| Aeration pad | Fluidising pad / aeration membrane | Silo air pad, fluidisation pad, air slide pad |
| Discharge valve | Butterfly or slide gate valve | Silo gate, outlet valve, silo discharge gate |
| Silo filter | Dust collector | Silo top dust filter, bag filter, vent filter |
| Cement screw | Screw conveyor | Auger, screw feeder, cement auger |
How to Identify Which Silo Part You Need
Four things identify almost any silo part. If you send us these, we can quote without asking again:
- The silo capacity. 50, 100, 150, 200 or 300 tonnes — often on a plate at the silo base. It sets the valve and aeration sizing.
- The DN or flange size. For valves and pipes, the nominal diameter (DN200, DN250, DN300) is what fixes the part, not the brand.
- Bolt hole pattern. Count the bolt holes and measure the pitch circle — two valves of the same DN can have different flange drillings.
- A photograph beside a tape measure. This is the fastest route. Send it on WhatsApp and we will identify the part and quote the same day.
We supply these parts for batching plants we have relocated and for plants we have never seen — the silo components are standard across most Chinese-manufactured silos. If you are unsure, send a photo rather than a guess.
Symptom → What Has Actually Failed
Most silo problems are diagnosed from the symptom, not from a part number. This is the mapping we use on site:
| Symptom | Usual cause | Part to check first |
|---|---|---|
| Cement will not flow, or discharge is slow | Cement compacted in the cone; aeration not working | Aeration pads, then the discharge valve |
| Dust puffing out around the silo top | Dust collector blocked or filter bags torn | Silo top dust collector / filter bags |
| Safety valve hissing continuously | Worn valve seat, or the vent is blocked so pressure cannot escape | Safety valve seat kit — and check the dust collector is not blinded |
| Level reading stuck at full or at empty | Rotary paddle jammed or bent; diaphragm sensor clogged with cement | Level indicator |
| Butterfly valve will not close fully | Seat worn, or cement packed behind the disc | Valve seat kit first; complete valve if the body is worn |
| Silo walls drumming while filling | Air cannot escape because the vent filter is blinded | Dust collector filter |
| Cement setting inside the silo, or water found in it | Condensation from humid aeration air, or a failed silo top gasket | Aeration air dryer, silo top gaskets and seals |
How Long Silo Parts Usually Last
Change-out intervals depend far more on duty cycle and climate than on the calendar. As a working guide from plants we service:
- Butterfly valve seats — 1–2 years on a plant running several batches an hour, 3–4 years on a low-cycle site.
- Aeration pads — 3–5 years. Fabric pads fail faster in humid coastal climates; ceramic pads tolerate moisture better.
- Dust collector bags — 1–3 years, driven mostly by dust load and whether the vent is correctly sized.
- Safety valve seals — 2–3 years. A valve that never lifts has a seal that dries out and sticks.
- Level indicators — they rarely fail with age. They fail when the paddle is bent during cleaning, or the motor burns out cycling against packed cement.
Rather than replacing on a calendar, keep a spare of the three items that actually stop production: a butterfly valve seat kit, one set of aeration pads, and a level indicator. Our maintenance and repair service carries these for HZS60–HZS180 silos, and this silo maintenance guide covers the inspection routine.
Cement Silo Parts FAQ
How do I know which level indicator fits?
Send us your silo model, height and flange size, and we will supply the correct rotary or diaphragm level indicator.
Do you supply silo safety valves?
Yes, spring-loaded pressure relief valves for 50 to 200 ton cement silos, CE compliant.
Can you help with silo aeration systems?
Yes, we supply aeration pads, fluidizing units and complete aeration systems for reliable cement discharge.
Why is my silo not discharging cement?
Work through it in this order: is the aeration running (listen for the blower, feel for air at the pads); is the butterfly or slide gate actually opening fully; has the cement compacted in the cone because the silo sat full and idle for weeks? Compacted cement and dead aeration pads account for most slow-discharge complaints, and both are cheaper to fix than replacing the valve.
How often should silo parts be replaced?
On condition, not on a calendar. Valve seats typically last 1–2 years on a high-cycle plant and 3–4 on a low-cycle one; aeration pads 3–5 years; dust collector bags 1–3 years; safety valve seals 2–3 years. In humid coastal climates, fabric aeration pads and bag filters fail noticeably faster.
Which silo parts should I keep as spares?
Three items stop production and cost little to stock: a butterfly valve seat kit, one set of aeration pads, and a level indicator. Everything else on the silo can usually wait for a shipment, but a plant that cannot discharge cement is losing a day of output for a part worth a fraction of it.
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Cement Silo Parts Diagram — Where Each Part Sits
Most ordering mistakes happen because the buyer and the supplier are talking about different parts. Use the layout below to name the part by where it sits on the silo, not by what the last supplier called it.
| Position on the silo | Parts you will find there | What it does |
|---|---|---|
| Silo top | Pressure/vacuum safety valve, dust collector (vent filter), high-level indicator, filling pipe | Lets air escape while cement goes in, relieves over-pressure, tells you when the silo is full |
| Upper body | Level indicator (high/low), inspection hatch, pressure gauge | Inventory reading and manual access |
| Cone / hopper | Aeration pads (fluidising pads), arch breaker or air cannon, vibrator | Turns compacted cement back into a flowing material so gravity can move it |
| Outlet | Discharge valve (butterfly or slide gate), manual gate, low-level indicator | Starts and stops the flow into the screw conveyor or weigh hopper |
| Below the outlet | Screw conveyor (auger), its bearings and couplings | Moves cement to the batching scale |
If you are ordering from a drawing, the three parts that carry the most wrong orders are the safety valve (people ask for a "breather" or "explosion vent"), the aeration pad (asked for as "fluidising membrane" or "air slide pad") and the level indicator (asked for as "level sensor" or "level switch"). The naming table above maps these across suppliers.
Aeration Pads — The Part Most Often Blamed and Least Often Checked
When cement stops flowing, the aeration pad is the first suspect and often the wrong one. Understand what the pad actually does and you will diagnose the problem in one visit instead of three.
The pad sits inside the cone and is fed with low-pressure air from a small blower. That air passes through the porous pad into the cement, breaking the friction between particles so the material behaves like a liquid and flows down the cone by gravity. If the air does not get through — blocked pores, torn fabric, wet air — the cement bridges over the outlet and nothing you do at the discharge valve will help.
| What you see | What it usually means |
|---|---|
| Cement will not flow but the valve opens normally, and it flows again after hammering the cone | Aeration is weak — blocked pads or low blower pressure, not a valve fault |
| Air blows back out of the silo top or the pad lifts off its seat | Pad torn or its fixing failed — replace the pad, not the blower |
| Cement appears in the air line or the blower filter | Pad has failed and cement is back-feeding — stop the blower and replace |
| Cement sets hard inside the silo, or you find water in it | Wet aeration air — the dryer or filter on the aeration line is not working |
Two practical points. First, fit a dryer or coalescing filter on the aeration air line — humid air is the single most common cause of pad failure and of cement setting in the cone. Second, keep one spare set of pads in stock: they are cheap, they fail without warning, and a plant standing idle waiting for pads costs far more than the pads do. Ceramic pads resist wear better; fabric pads are cheaper and easier to change. Tell us the silo size and the cone geometry and we will match the pad to your build.