Product Functions

Deliver precise metered dosage of sulfurous acid (aqueous sulfur‑dioxide solution) into corn steeping circuit and accurately control SO₂ concentration within steep liquor. It suppresses microbial reproduction, disintegrates corn protein matrix and facilitates starch‑protein separation to guarantee stable steeping process. Manual stroke adjustment available; accepts 4‑20 mA analog signal from central control for automatic proportional dosing. Key process‑control equipment for steeping workflows.

Structural composition

1. Drive motor

2. Stroke‑adjustment transmission assembly

3. Pump‑head wetted chamber

4. PTFE diaphragm (core wear‑prone spare)

5. Inlet / outlet check valves (ceramic ball & seat)

6. Flow‑adjustment knob; Optional modules: 4‑20 mA signal interface, pulse‑control module, leak‑detection switch

Working principle

Mechanical diaphragm metering pump. Motor drives transmission assembly to actuate reciprocating deflection of diaphragm. Periodic diaphragm deformation changes pump‑chamber volume; paired inlet‑outlet check‑valves achieve fluid suction and discharge. Output flow can be continuously modulated by adjusting diaphragm stroke length or reciprocating frequency. Diaphragm fully segregates chemical fluid from drive side to realize zero shaft‑leakage performance for corrosive‑liquid transfer.

Operating Conditions & Material Requirements (corn steeping)

• Transport medium: Aqueous sulfurous‑acid solution, weakly acidic and corrosive

• Medium temperature: Ambient, maximum ≤50℃

• Working pressure: 0.2‑0.4 MPa

• Pump‑head material: PVDF (Polyvinylidene fluoride)

• Diaphragm: PTFE composite diaphragm

• Valve ball & seat: Ceramic

• Gaskets: PTFE. Conventional rubber gaskets are prohibited due to swelling‑corrosion risk.

• Control scheme: Local manual stroke setting + remote 4‑20 mA signal, interlocked with PLC for automated dosing‑volume control.

Technical Features

1. High metering accuracy and continuously adjustable output to stabilize sulfurous‑acid concentration in steep liquor

2. Diaphragm‑sealed design eliminates shaft‑seal leakage and prevents sulfurous‑acid vapor escape

3. All wetted components resist sulfurous‑acid corrosion for starch food‑grade environment

4. Supports automatic signal interlock with steeping‑system for unattended auto‑dosing

5. Modular construction; diaphragm and valve balls are readily replaceable wear‑parts for easy on‑site servicing.