Reverse-flow prevention
Designed to prevent backflow and protect product integrity and downstream equipment.
Backflow PreventionSafety
Non-Return Valves
Control / Check Valves — Hygienic
Non-Return Valves (Hygienic Check Valves)
Non-return (check) valves are hygienic one-way valves used to prevent reverse flow in process lines, protecting equipment and supporting consistent product quality. The LKC series is available in versions for vertical flow and horizontal flow, making installation practical in a wide range of piping layouts.
Overview
Hygienic non-return valves are used for single-direction product flow and process protection. In the LKC design, the valve opens and closes automatically depending on pressure, helping prevent reverse flow.
Working principle
- The valve plug is assisted by a spring that keeps the valve closed.
- The valve opens when inlet pressure exceeds the spring force and closes when pressure drops.
- If reverse flow occurs, spring force and outlet pressure keep the valve closed to prevent backflow.
- This supports product safety and protects process equipment in hygienic lines.
Typical applications
- Single-direction product flow in hygienic process lines
- Protection of pumps, instruments, and sensitive equipment
- Dairy, food, beverage, brewery and similar hygienic industries
- Sampling and sterilization routines (with non-return accessories)
Key benefits
Reliable, hygienic, self-acting check valves for process protection and one-way flow control.
Self-acting operation
Spring-assisted plug opens/closes automatically based on pressure conditions.
Self-ActingSpring-Assisted
Hygienic installation
Suitable for hygienic piping and easy to integrate into existing process lines.
HygienicEasy Install
Equipment protection
Helps protect process equipment from reverse-flow events and pressure disturbances.
ProtectionReliability
Layout flexibility
Available variants for vertical and horizontal flow to suit real piping constraints.
VerticalHorizontal
Sampling support option
Non-return accessories can support safe sampling/sterilization routines where needed.
SamplingSteam Sterilization
Models & variants
LKC Non-Return Valve
Hygienic one-way check valve used across hygienic industries to prevent reverse flow. Easy to install and designed for safe, single-direction flow.
HygienicOne-Way FlowCheck Valve
LKC-2 (Vertical Flow)
LKC variant intended for vertical flow installation. Selected when piping layout is vertical and opening characteristics must match that geometry.
LKC-2Vertical
LKC-H (Horizontal Flow)
LKC variant intended for horizontal flow installation. Suitable for horizontal pipe runs and compact installations.
LKC-HHorizontal
Non-Return Valve for Sampling
Accessory-type non-return valve used during steam sterilization routines for sampling valves: allows steam through while blocking product during sampling.
SamplingSteam SterilizationAccessory
Connection options
Hygienic connection formats can be selected based on site standards (e.g., clamp or welded solutions) and line interface requirements.
Clamp / WeldHygienic Ends
Service & spares
Maintenance-friendly design: plug, spring and seals are typical service parts. We can propose spare kits based on your exact variant and size.
SparesService
Quick comparison
A fast selection view for vertical vs. horizontal installations and sampling routines.
| Variant | Best for | Key advantages | Common notes |
|---|---|---|---|
| LKC-2 (Vertical) | Vertical piping runs | One-way flow, backflow prevention, equipment protection | Select based on pipe geometry and process conditions |
| LKC-H (Horizontal) | Horizontal piping runs | One-way flow, practical fit for compact horizontal layouts | Selected when installation is horizontal and space is limited |
| Sampling Non-Return (Accessory) | Sampling + steam sterilization routines | Allows steam flow; blocks product during sampling | Accessory selection depends on sampling valve type and setup |
* Final selection depends on product/media, pressure/temperature, piping orientation, cleaning regime, and site connection standards.
Selection checklist
Send these details for correct valve sizing, variant selection and connection recommendation.
Process data
- Media / product type (clean product, CIP media, steam routines if applicable)
- Operating temperature range
- Operating pressure (normal + peaks)
- Flow direction and piping orientation (vertical or horizontal)
- Connection standard (clamp/weld and site standard)
Operational needs
- Main line backflow prevention (choose LKC-2 or LKC-H based on orientation)
- Need for sampling/sterilization non-return accessory (if sampling is part of process)
- Cleaning regime: CIP / SIP / steam sterilization (where relevant)
- Spare parts preference (seal material and service kit planning)
- Documentation requirements for projects
Need a quick recommendation?
Tell us your line size, orientation (vertical/horizontal), pressure & temperature, product/media details, and connection standard. We’ll propose the correct non-return valve variant and options.
FAQ
Quick answers to common non-return (check valve) questions.
What is a non-return (check) valve?
A non-return valve is a one-way valve that allows flow in only one direction and closes automatically to prevent reverse flow (backflow).
How does a spring-assisted check valve work?
The spring holds the plug closed until inlet pressure exceeds the spring force. If flow reverses, the plug closes to block backflow.
Should I choose vertical or horizontal variants?
Choose based on the piping orientation at the installation point. Selecting the correct variant helps ensure proper opening/closing behavior.
When do I need a non-return valve in sampling routines?
In sampling setups that use steam sterilization, a non-return accessory can allow steam to pass while blocking product during sampling, improving safety and hygiene.
Request a quotation & technical support
Share your line details and we’ll propose the correct hygienic non-return valve solution.
We’ll match the right non-return valve to your line orientation and duty.
Send line size, orientation (vertical/horizontal), pressure & temperature, media/product details, and connection standard. We’ll respond with a clear technical proposal and quotation.