Efficient Air Evacuation
Fast priming by evacuating air from the suction pipe for stable return and transfer duties.
Self-PrimingAir Handling
Sanitary Self Priming Pumps
Hygienic Pump Solutions
Self-Priming Pumps
High-efficiency self-priming hygienic pumps designed to evacuate air from the suction line, support tank emptying and CIP return, and deliver stable performance where air may be present. With verified effective CIP cleanability, they can also be used as product pumps in hygienic processes.
Overview
Self-priming hygienic pumps are designed for applications where the suction line can contain air. They help maintain stable operation in CIP return, tank emptying, and other processes with intermittent flow or entrained air.
Standard Design
- CIP compatible hygienic construction.
- Stainless steel motor shroud for protection.
- Complete unit supported on four adjustable stainless steel legs.
- Impeller can be trimmed to suit application requirements.
Shaft Seals
- External single or double mechanical shaft seal options.
- Stationary seal rings: stainless steel (AISI 329), sealing surface: silicon carbide.
- Rotating seal rings: carbon (standard).
- Double seal option supports flushing with controlled water consumption.
Key Benefits
Fast priming, hygienic design and stable operation for air-in-line conditions.
Low Noise Operation
Designed for quieter performance while maintaining strong pumping efficiency.
Low NoiseEfficient
Hygienic & CIP-Cleanable
Effective CIP cleanability for return duties and (where validated) product transfer.
CIPHygienic
Configurable Connections
Available with common hygienic connection standards to match your piping system.
SMSDIN 11851
Wide Speed Range
Separate operating ranges for air evacuation and product pumping support flexible control.
ControlVFD Ready
Service-Friendly Build
Seal options and accessible design help reduce downtime and simplify maintenance.
MaintenanceUptime
Technical Data
Typical technical data for hygienic self-priming pump assemblies (final configuration may vary by model).
| Category | Specification |
|---|---|
| Standard materials |
Product-wetted steel parts: 1.4404 (316L) Other steel parts: Stainless steel Inside surface finish: Standard blasted Product-wetted elastomers: EPDM |
| Min/Max speed |
Air evacuation: 2800–3600 rpm Pumping product (no air): 900–3600 rpm |
| Pressure | Max inlet pressure: 500 kPa (5 bar) |
| Temperature | Temperature range: -10°C to +140°C (EPDM) |
| Double mechanical seal (flush) |
Water inlet pressure: max. 500 kPa (5 bar) Water consumption: 0.25–0.5 l/min |
* Values shown as typical reference. Final selection depends on liquid properties, installation, connection standard and seal configuration.
Models & Complete Pump Configurations
Two hygienic self-priming pump sizes are available. Below are complete pump configurations with common connection standards and seal alternatives.
Size 20 — Connection: SMS union
- Seals: EPDM
- Shaft seal alternatives: SSS
- Shaft seal material: C/SIC
- Inlet: 63.5 mm
- Outlet: 51 mm
| Complete Pump (Denomination) | OEM Ref. Part No. |
|---|---|
| Pump, LKH-Pr-20/165-SSS-3.00kW-EPDM | 6-9618 23 0151 |
| Pump, LKH-Pr-20/120-SSS-3.00kW-EPDM | 6-9618 23 0221 |
| Pump, LKH-Pr-20/165-SSS-4.00kW-EPDM | 6-9618 16 7458 |
| Pump, LKH-Pr-20/143-SSS-4.00kW-EPDM | 6-9618 23 0476 |
| Pump, LKH-Pr-20/165-SSS-5.50kW-EPDM | 6-9618 16 7586 |
| Pump, LKH-Pr-20/155-SSS-5.50kW-EPDM | 6-9618 19 7221 |
| Pump, LKH-Pr-20/165-SSS-7.50kW-EPDM | 6-9618 16 7455 |
| Pump, LKH-Pr-20/163-SSS-7.50kW-EPDM | 6-9618 23 4765 |
* Motor efficiency options may vary depending on supply.
Size 20 — Connection: DIN 11851 union
- Seals: EPDM
- Shaft seal alternatives: SSS
- Shaft seal material: C/SIC
- Inlet: 65 mm
- Outlet: 50 mm
| Complete Pump (Denomination) | OEM Ref. Part No. |
|---|---|
| Pump, LKH-Pr-20/131-SSS-3.00kW-EPDM | 6-9618 23 0172 |
| Pump, LKH-Pr-20/155-SSS-4.00kW-EPDM | 6-9618 23 0517 |
| Pump, LKH-Pr-20/165-SSS-5.50kW-EPDM | 6-9618 15 4276 |
| Pump, LKH-Pr-20/159-SSS-5.50kW-EPDM | 6-9618 23 0981 |
| Pump, LKH-Pr-20/164-SSS-5.50kW-EPDM | 6-9618 23 1015 |
* Ask us for additional motor efficiencies, voltage and frequency options.
Size 40 — Connection: SMS union
- Seals: EPDM
- Shaft seal alternatives: SSS, DMS
- Shaft seal material: C/SIC
- Inlet: 76.1 mm
- Outlet: 63.5 mm
| Complete Pump (Denomination) | OEM Ref. Part No. |
|---|---|
| Pump, LKH-Pr-40/170-SSS-11.00kW-EPDM | 6-9618 23 2232 |
| Pump, LKH-Pr-40/190-SSS-11.00kW-EPDM | 6-9618 19 5612 |
| Pump, LKH-Pr-40/200-SSS-15.00kW-EPDM | 6-9618 16 7741 |
Size 40 — Connection: DIN 11851 union
- Seals: EPDM
- Shaft seal alternatives: SSS, DMS
- Shaft seal material: C/SIC
- Inlet: DN80
- Outlet: DN65
| Complete Pump (Denomination) | OEM Ref. Part No. |
|---|---|
| Pump, LKH-Pr-40/173-SSS-7.50kW-EPDM | 6-9618 23 1718 |
| Pump, LKH-Pr-40/210-SSS-15.00kW-EPDM | 6-9618 23 2532 |
* Double mechanical seal (DMS) options are available where required by the application.
Selection Checklist
Send the following to receive the correct pump size, trim, connection and seal recommendation.
Process Data
- Liquid type (product / CIP media) and viscosity range
- Temperature range (process + cleaning)
- Required flow rate (min/nom/max)
- Discharge pressure / system losses
- Suction conditions (lift height, suction line length, air content)
Build & Options
- Connection standard (SMS / DIN 11851 / other)
- Elastomers (EPDM or alternatives as required)
- Seal type (single or double mechanical seal) + flush requirements
- Motor efficiency, voltage/frequency, VFD operation
- Hygienic requirements and documentation (if needed)
FAQ
Quick answers for specification and application questions.
What is a self-priming pump?
A self-priming pump can evacuate air from the suction line and establish prime without manual filling, making it ideal for duties like tank emptying and CIP return where air may be present.
Can it be used as a product pump?
Yes—when hygienic design and effective CIP cleanability are verified for the selected configuration, these pumps can be used for product transfer as well as return duties.
When should I choose a double mechanical seal?
Double seals are commonly selected for higher hygiene requirements, better leakage control, or when a seal flush plan is preferred for reliability in demanding conditions.
Request a Quote & Technical Support
Send your process data and we’ll recommend the best configuration (size, trim, seals, and connections).
Fast selection for your CIP return & tank emptying duty
Share your liquid, temperature, flow, pressure, suction conditions and preferred connection standard. We will propose the most suitable self-priming pump configuration and options.