How to calibrate and adjust the safety relief valve on IHF pump?

The internal safety relief valve prevents overpressure. Set the cracking pressure at 1.05 to 1.15 times the rated working pressure. Use a specialized tool to slowly loosen the locking nut until the valve opens at the target pressure, then re-lock and test for proper reseating without leakage.

What are the speed reduction rules for IHF pump when handling high viscosity fluids?

When handling fluids with significantly increased viscosity, motor speed must be reduced. High viscosity causes drastic friction resistance; maintaining rated speed risks cavitation and motor overload. It is recommended to control speed between 70% and 85% of the rated value via VFD to balance flow requirements with mechanical load.

How to troubleshoot shaft seal leakage on IHF pump?

The IHF pump uses an external carbon fiber bellows mechanical seal. Minor dripping is normal for heat dissipation, but continuous weeping requires immediate shutdown. Routine maintenance includes greasing the bearing box and checking O-ring aging. Never replace with packing glands to avoid damaging the fluoroplastic lining integrity.

IHF SERIES9 modelsHS: 8413.70.99

IHF Fluoroplastic-Lined Chemical Centrifugal Pump (IHF Series)

Chemical, Magnetic & Diaphragm Pumps•IHF

Flow Range: 3.5 ~ 200 m³/h
Head Range: 20 ~ 80 m
Motor Power: 1.5 ~ 75 kW
Model: IHF-32-25-125 → IHF-150-125-250
Customs HS Code: 8413.70.99

WhatsApp Quick Quote Email for Price & DrawingModel-by-Model Technical Specifications ↓

IHF Fluoroplastic-Lined Chemical Centrifugal Pump (IHF Series)

Hydraulic Principle & Internal Construction

The IHF series fluoroplastic-lined centrifugal pump features a rugged ductile iron casing armored with a dense, crack-resistant lining of virgin PTFE or FEP (3–5 mm thickness). Designed for aggressive inorganic acids (hydrochloric, hydrofluoric, concentrated sulfuric, nitric) and strong alkaline solutions, it withstands full chemical corrosion across -20°C to +150°C.

Model-by-Model Technical Specifications

Model	Inlet	Outlet	Flow (m³/h)	Head (m)	Speed (rpm)	Motor (kW)
IHF-32-25-125	DN32	DN25	3.5	20	2900	1.5
IHF-40-32-160	DN40	DN32	6.3	32	2900	3
IHF-50-32-160	DN50	DN32	12.5	32	2900	4
IHF-65-40-200	DN65	DN40	25	50	2900	7.5
IHF-65-50-250	DN65	DN50	25	80	2900	15
IHF-80-65-160	DN80	DN65	50	32	2900	11
IHF-100-65-200	DN100	DN65	100	50	2900	22
IHF-125-100-200	DN125	DN100	160	50	1450	37
IHF-150-125-250	DN150	DN125	200	80	1450	75

Selection guidance: match your duty point to the closest model below, then confirm with our engineers. Values are rated operating points at the listed speed.

Need Complete Engineering Dimensions & Curves?

Download the official IHF series 1-page technical datasheet covering all 9 model configurations.

Media Compatibility & Viscosity / Temperature Guide

Medium	Max Viscosity (cSt)	Application Note
Nitric / Sulfuric / Hydrochloric Acids (All Concentrations)	200	F46/PVDF Fluoropolymer Lining
Hydrofluoric Acid / Sodium Hydroxide / Aqua Regia	150	100% Virgin Fluoropolymer Wetted Path
Organic Solvents / Strong Oxidizing Agents	100	Acid & Alkali Resistant
Pickling Acid Solutions for Electroplating	120	PCB Etching Process

International Benchmark & Interchange Guide

International Benchmarks

Saint-Gobain / Verder fluoroplastic-lined pumps
Mega (Australia) lined chemical pumps
Goulds (ITT) lined pumps

Interchange Note

Fluoroplastic PTFE/FEP-lined centrifugal pump. Direct replacement for Richter SCK, Flowserve Durco Mark 3 fluoropolymer-lined, and KSB chemical lined pumps.

Materials & Shaft Seal Selection Guide

Engineering metallurgy and seal selection advice for corrosiveness and temperature: IHF pump casings are recommended to use QT450-10 ductile iron, lined with F46/PVDF/PFA fluoroplastics to resist strong acids and alkalis. All wetted parts are fully fluoroplastic, with impellers and covers bonded via metal inserts using ultra-high temperature molding. The shaft seal should be a carbon-silicon-carbon vs. carbon-silicon-carbon external bellows mechanical seal to prevent leakage; the bearing box uses grease lubrication isolated from the medium. Never use packing glands to replace original seals, as this may damage the lining integrity.

Casing & Housing Materials: Ductile Iron Casing with Molded F46 / PVDF / PFA Fluoropolymer Lining (4–8mm)
Rotor / Gear / Screw Elements: Carbon Steel Armored Molded F46 Fluoropolymer Impeller
Shaft Sealing Options: External PTFE Bellows Mechanical SealSilicon Carbide vs Silicon Carbide (SiC/SiC) Mechanical Seal

Engineering FAQ

Suction pipe diameter should match or exceed the impeller inlet to minimize velocity. Ensure at least 5 pipe diameters of straight run before the inlet to stabilize flow. Install the pump as close to the liquid source as possible, avoiding long suction lifts, and strictly verify NPSHa with a safety margin of over 0.5 meters to prevent cavitation.

📐 Engineering Selection Methodology

Correct pump selection starts from the fluid, not the pump. Confirm the medium name and actual viscosity at working temperature, the required flow and differential pressure or head, suction conditions (flooded or lift), and whether the fluid crystallizes, shears, contains particles or gas. Positive displacement pumps must always be protected by a relief valve or pressure bypass on the discharge line, and must never be started against a closed valve unless a bypass is fitted. For viscous duties, derate rotational speed to preserve volumetric efficiency; for crystallizing or high-freezing-point media, specify jacketed casings with steam or thermal-oil heating. Our engineers verify each enquiry against these rules before quoting.

🏭 Manufacturing & Quality Control

Castings are produced in our own foundry cluster with material certificates for each heat number. Gear profiles, screw threads and rotor lobes are hobbed, ground and wire-cut to tolerance, then assembled with matched bearing sets. Before dispatch every pump passes casing hydrostatic pressure testing, a run-in test at rated speed on an oil bench, and relief valve cracking-pressure verification; test records are archived against the pump serial number and can be supplied with the shipment.

📦 Export Packaging & Delivery

Pumps are preserved with anti-rust coating, flanges blanked, and packed in export-grade plywood cases with steel strapping for sea freight. Document packs include operating manual, performance test record, packing list and material certificates on request. Standard models ship from stock; engineered configurations typically require 15-35 days depending on casing material and seal options. Spare rotor sets, seal kits and relief valve assemblies can be quoted together with the base pump.

Typical Applications & Industry Use Cases

The media compatibility table above maps directly to real industry duties. In lubrication circuits, size the pump for continuous duty at 70-80% of rated flow to leave margin for viscosity drift as oil warms up. In chemical transfer, confirm the medium's specific gravity and whether it is shear-sensitive before fixing rotational speed. In food and sanitary service, schedule CIP cycles around the product changeover plan and verify elastomer compliance with the relevant food-contact regulation in your market. In hot oil and asphalt service, always pre-heat the casing to the medium temperature before start-up so internal clearances are at operating dimension - a cold start against solidified product is the single most common cause of gear pump failures reported from the field.

Commissioning & Maintenance Guidance

Before first start: verify rotation direction, fill the casing with medium, open the discharge bypass, and jog the motor to confirm free rotation. Check the relief valve setting against the system design pressure and lock the adjuster. During the first hour, record suction and discharge pressures, medium temperature, and motor current - deviations from the quotation duty point usually indicate suction restriction or an over-throttled discharge line. Routine maintenance intervals: inspect the shaft seal weekly during the first month, then monthly; check coupling alignment after any pipe work; drain and inspect the bearing housing annually. Keep a log of running hours so rotors, bearings and seals can be replaced on condition rather than after failure.

Troubleshooting Quick Reference

No delivery or loss of prime: check suction line for air ingress, verify foot valve and strainer are submerged and clean, and confirm the casing is primed for pumps without self-priming capability. Flow below nameplate: verify actual rotational speed against the data sheet, confirm medium viscosity is within the rated band, and inspect internal clearances for wear if the pump has long service hours. Abnormal noise or vibration: usually coupling misalignment, cavitation from excessive suction lift, or foreign matter in the pumping chamber. Seal leakage: confirm flush plan and seal face condition; never run a mechanical seal dry. Motor overload: check for over-viscous medium at start-up temperature and confirm the relief valve is not set above the motor's capability. For anything beyond these basics, send us the serial number and symptom - our engineers will respond with a diagnosis.

📋 Standards, Testing & Documentation

Gear pumps in this catalog are designed and acceptance-tested with reference to JB/T 6434 (external gear pumps), three-screw pumps to GB/T 10886, centrifugal chemical pumps to ISO 2858, and sealless or screw pumps to the relevant API 676 guidance, with mechanical seals supplied to API 682 configurations on request. Sanitary models are manufactured with surface finishes suitable for FDA / 3A style hygienic duties. Each shipment can include: performance test record against the quoted duty point, hydrostatic test certificate, material certificates for pressure-retaining parts, operating and maintenance manual, and a dimensional drawing with flange table. Tell us which standards your project specification cites and we will align the documentation pack accordingly.

🔧 Spare Parts & After-Sales Support

Every pump model page doubles as a spare-parts reference: rotor and gear sets, bearing and thrust assemblies, complete seal cartridges, relief valve kits and jacket gasket sets are manufactured in-house to the same drawings as the original build - so spares ordered years later still match. Recommended commissioning spares are one seal set and one gasket set per pump; for critical continuous-duty installations we recommend a full rotor set held on site. When ordering spares, quote the pump serial number and nameplate data so the correct material and clearance class is supplied. Technical support in English is available by email during China business hours, with video call diagnostics available for installation and commissioning issues.

ℹ️ Technical data on this page is sourced from the manufacturer's engineering database and applicable standards (JB/T 6434, GB/T 10886, ISO 2858, API 676). Final selection must be confirmed by our engineers against your actual duty conditions.

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