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Aseptic Mixproof Valve

The sanitary mix-proof valve is specially designed to prevent the mixing of different fluids in hygienic process lines. With a double-seat structure and leakage chamber, it ensures absolute product separation and offers reliable leakage detection. Made from high-grade stainless steel such as SS 316L, it meets stringent hygiene standards like 3-A and EHEDG. The valve supports CIP (Clean-in-Place) operations without process interruption, significantly improving production efficiency. Its robust construction, easy maintenance, and automation compatibility make it an ideal choice for industries such as food, beverage, dairy, pharmaceuticals, and biotechnology.

Overview
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Detailed Description

TFH6/FH8 Double Seat Mix-Proof Valve – Advanced Hygiene & Safety in Process Control

The FH6/FH8 mix-proof valve is a pneumatically operated, normally closed (NC) hygienic valve engineered for demanding applications where cross-contamination prevention and process reliability are critical.

Featuring a double-seat design with two independent seals on the valve disc, the valve creates a leakage chamber between the seals. In the event of seal wear or failure, any product leakage is automatically diverted to the chamber and safely discharged via a dedicated outlet—ensuring zero product mixing between different lines.

Key benefits include:

Hygienic operation: Ensures product purity in multi-line processing systems by preventing backflow and cross-contamination.

CIP-ready: The valve supports Clean-in-Place (CIP) cleaning without halting production, increasing system uptime and operational efficiency.

No product loss: Under normal conditions, the leakage chamber remains closed, maintaining a clean and controlled process environment.

Automation compatibility: The FH6/FH8 can be equipped with intelligent control heads from top automation brands such as Burkert, Alfa Laval, or GEMÜ. This enables remote actuation, real-time diagnostics, and sensor integration, supporting smart process control.

Ideal for the food and beverage, dairy, pharmaceutical, and personal care industries, this mix-proof valve delivers exceptional reliability, cleanability, and compliance with hygienic standards.

Parameter

Basic function of FH6 series:

① Valve Position: CLOSED

Control air pressure: 0 bar at connection L1 (main stroke)

Control air pressure: 0 bar at connection L2 (upper valve disc stroke)

Control air pressure: 0 bar at connection L3 (lower valve disc stroke)

Separation of two different media is ensured.

In case of leakage, the product will be discharged outward through the leakage chamber under depressurized conditions.

② Valve Position: OPEN

Control air pressure: 6 bar at connection L1 (main stroke)

The bottom valve disc lifts, closing the leakage chamber.

Both valve discs are in the open position.

The upper and lower valve discs are fully opened relative to each other, allowing product flow.

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③ Cleaning the Upper Valve Seat

Control air pressure: 6 bar at connection L2 (upper valve disc stroke)

During the cleaning process, the top valve disc is lifted with an adjustable stroke (pulse stroke should be set appropriately).

The valve seat, valve disc seals, clearance areas, and leakage exhaust pipe are thoroughly cleaned.

④Cleaning of the lower seat via valve housing. Control air pressure of 6 bar at connection L3. The bottom valve disk is lifted during the cleaning procedure. The valve seat, valve disk seals, and clearance, as well as the leakage exhaust pipe, are thoroughly cleaned.

aseptic mixproof valve details

Basic function of FH8 series:

①Valve position: CLOSED

Control air pressure: 0 bar

Connection: Separation of two hostile media

Leakage (if any): Guided outward through the leakage chamber in a depressurized state.

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②Valve Position: OPEN

Control Air Pressure: 6 bar at connection L

The bottom valve disk lifts, closing the leakage chamber.

Both valve disks are in the "open" position.

The upper and lower valve seats are open, allowing flow between the two lines.

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Operation of FH4 tank bottom mix-proof valve

①Internal Leakage Drainage

Control air pressure: 0 bar at connection L1 (main stroke)

Control air pressure: 0 bar at connection L2 (upper valve disk stroke)

Control air pressure: 0 bar at connection L3 (lower valve disk stroke)

The two different media are separated.

Any leakage, if it occurs, is drained outward through the leakage chamber in a depressurized state.

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②Valve Status: Open

Control Air Pressure: 6 bar at connection L1

The bottom valve disk lifts and closes the leakage chamber.

Both valve disks are in the "open" position.

The top and bottom flow paths are open and connected to each other.

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③Washing the Leakage Cavity of Pipe and Valve

Control air pressure: 6 bar at connection L2

During the cleaning process, the top valve disk is lifted with an adjustable stroke (pulse)

Set the stroke according to the cleaning requirements

The valve seat, valve disk seals, clearance area, and the leakage/exhaust pipe are all effectively cleaned

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④Washing the Leakage Cavity of Tank and Valve

Control air pressure: 6 bar at connection L3

During the cleaning process, the bottom valve disk is lifted

The valve seat, valve disk seals, clearance area, and the leakage/exhaust pipe are thoroughly cleaned

AVM double seat valve matrix ensures compliance with factory sanitary and aseptic requirements.

The factory is capable of establishing fully automated, multi-way valve systems.

The valve matrix supports efficient operation of modern production processes and CIP/SIP cleaning cycles, maximizing workshop utilization and optimizing cost efficiency.

Double seat valves ensure reliable product separation and prevent cross-contamination.

Please refer to the photo for details.

Technical data

Material	Contaot product parts	316L(1.4404)
	non-contact product parts	304(1.4301)
	Provide EN 102043.1B certificate
Seal material	Standard	EPDM
	Option	NBR\FPMSilicone
	All seal materals comply wih FDA 177.2600
Temperature	Running working temperature	-20~+135℃(EPDM)
	Sterillzation temperature	150℃(Max 20min)
Pressure	Working pressure	0-5bar
	Accepting high pressure requirement
	Control air pressure	6~8bar
Surface treatment	Internal surface	Ra≤0.8μm
	External surface	Grit blasting
Connection	Connection standard	welded end:DIN 11850 series2
		welded ond:INCH pipe standard
	Connection method:welding、thread、clamp、flange
Option	Inteligont controlor	24V DC
		1/3 electromagnetism valve
	Position sonsor	24V DC
		2/3/4 NPN/PNP position sensor

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FH7 mix-proof divert series

dimensions(mm)
DN	A	B	L	L1	D	H	S	DN	Stroke(K)	M(DIN)
DN40	350.5	90	60	65	89	8	29*1.5	41×1.5	23	21.5
DN50	384.1	103B	74.5	85	123	B	29*1.5	53x1.5	30	21.5
DN65	392.8	1135	91.5	100	123	B	41*1.5	70×2.0	36.5	28
DNB0	523.5	138	108	120	179	8	70*2.0	85*2.0	47.5	28
DN100	533	152	127	150	173	8	85*2.0	104*2.0	47.5	28
3A
1.5°	349	90	56.8	65	89	B	291.5	38.1×1.65	23	12.7
2.0'	382.8	103.B	72	85	123	B	29*1.5	50.8*1.65	30	12.7
2.5'	389.2	117	86	100	123	8	41*1.5	63.5×1.65	36.5	12.7
3.0'	519.5	125	99.9	110	173	8	53*1.5	76.2*1.65	42	12.7
4.0°	531	152	124.4	150	173	B	85*2.0	101.6*2.11	47.5	15.8

FH4 tank bottom mix-proof valve series

aseptic mixproof valve details

dimensions(mm)
DN	A	L	L1	D	S	K	DN	Stoke(K)
DN40	350.5	59.5	65	83	140	65	41×1.5	23
DN50	384.1	68.5	85	123	160	80	53×1.5	30
DN65	392.2	83	100	123	180	80	70×2.0	36.5
DNBO	523.5	90	120	173	200	100	85*2.0	47.5
DN100	533	95.5	150	173	220	100	104*2.0	47.5
3A
1.5°	348	58	65	83	140	65	38.1×1.65	23
2.0°	382.8	67	85	123	160	80	50.8*1.65	30
2.5°	389.2	76	100	123	180	B0	63.5x1.65	36.5
3.0°	519.5	B8	110	173	200	100	76.2*1.65	42
4.0°	591	99.5	150	179	220	100	101.62.11	47.5

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dimensions(mm)
DN	A	B	L	L1	D	H	S	DN	Stroke(K)	M(DIN clamp)
DN40	350.5	90	60	65	89	8	2971.5	41×1.5	23	21.5
DN50	384.1	103.B	74.5	85	123	8	29*1.5	53x1.5	30	21.5
DNE5	3928	113.5	91.5	100	123	8	41*1.5	70×2.0	36.5	28
DN80	523.5	138	108	120	173	8	70*2.0	85*2.0	47.5	28
DN100	533	152	127	150	173	8	85*2.0	104*2.0	47.5	28
3A
1.5°	349	900	56.8	65	B9	8	29*1.5	38.1×1.65	23	12.7
2.0°	382.8	103.8	72	85	123	8	291.5	50.8*1.65	30	12.7
2.5°	389.2	117	86	100	123	8	41*1.5	63.5x1.65	36.5	12.7
3.0°	519.5	125	99.9	110	173	8	53*1.5	76.2*1.65	42	12.7
4.0°	531	152	124.4	150	173	8	85*2.0	101.6*2.11	47.5	15.8

DZ4 single seat mix-proof valve:

The DZ4 Mix-Proof Single Seat Valve is a pneumatically actuated seat valve featuring a hygienic and flexible design, based on a proven single-seat valve platform. It is specifically designed for processes where two different liquids flow through the same valve simultaneously. The valve not only prevents cross-contamination between fluids but also allows for easy monitoring of its operation. It is widely used in the dairy, beverage, pharmaceutical, and other hygienic industries.

The DZ4 valve is operated remotely using compressed air and is normally closed (NC) in its default state. It is equipped with two mini-type, normally open pneumatic valves — one serves as a drain valve and the other as a cleaning valve for CIP (Clean-in-Place) applications.

The valve stem is designed with two sealing rings, which create a leakage chamber between them. In the event of internal leakage, the product flows into the leakage chamber and is discharged through the drain valve. Before opening the main valve, the leakage chamber can be cleaned to ensure hygienic and safe operation.

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Technical data

Material	Contact product parts	316L(1.4404)
	non-contact product parts	304(1.4301)
	Provide EN 102043.1B certificate
Seal material	Standard	EPDM
	Option	NBR、FPM、Silicone
	All seal materials comply with FDA 177.2600
Temperature	Running working temperature	-20-+135℃(EPDM)
	Sterilization temperature	150℃(Max 20min)
Pressure	Working pressure	0-5bar(standard)
	Accepting high pressure requirement
	Control air pressure	5~8bar
Surface treatment	Interna surface	Ra≤0.8μm
	External surface	Grit blasting
Connection	Connection standard	welded end:DIN 11850 series2
		welded end:INCH pipe standard
	Connection method:welding、thread、clamp、flange
Option	Inteligent controller	24V DC
		1/2 electromagnetism valve
	Position sensor	24V DC
		2 NPN/PNPposition sensor

aseptic mixproof valve details

DN	B	H	K	C	L	β	D	M(DIN clamp)
DN40	296	109	90	25.2	65	30°	41×1.5	21.5
DN50	325.5	115	130	25.2	85	30°	53×1.5	21.5
DN65	352	128	130	25.2	90	30°	70×2.0	28
DNBO	422	137.5	195	25.2	110	30°	85*2.0	28
DN100	431	142.5	195	25.2	130	30°	104*2.0	28
INCH	B	H	K	C	L	β	OD	M(3A clamp)
1.5°	296	109	90	25.2	65	30°	38.1×1.65	12.7
2.0°	325.5	115	130	25.2	85	30°	50.8*1.65	12.7
2.5'	331	122.5	130	25.2	90	30°	63.5×1.65	12.7
3.0°	418.5	130	195	25.2	100	30°	76.2*1.65	12.7
4.0°	431	142.5	195	25.2	130	30°	101.62.11	15.8