Chemical valve with a PTFE insert

The chemical valve with a PTFE insert is a component of the detergent/chemical dosing circuit, responsible for controlling flow/dosing in the chemical line. The PTFE insert acts as the valve’s working surface, supporting stable shut-off and reducing the risk of sticking or leakage when in contact with chemicals.

MPN / reference: 13236

APPLICATION

The valve is used in typical service work on the chemical circuit:

• repair/refurbishment of the chemical feed circuit,
• eliminating leaks and shut-off problems in the chemical valve,
• restoring correct dosing when the chemical system behaves inconsistently,
• replacing the part after wear of working surfaces or damage to the insert.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Consider replacing the valve when you notice:

• no chemical draw despite correct system configuration,
• uncontrolled chemical draw (chemical flows even when “off”),
• leakage at the valve or leaks at connections,
• unstable dosing (draws sometimes, sometimes not) after ruling out the hose/filter,
• wear or damage to working parts found during disassembly.

HOW TO CHOOSE THE RIGHT PART

Selection should be unambiguous:

• confirm the part is for the chemical circuit (not the high-pressure water path),
• verify the manufacturer number: MPN 13236,
• compare with the removed part: connection method, flow direction, and body geometry,
• base selection on the machine’s service documentation.

In chemical systems, compatibility with the specific dosing design matters—similar-looking valves can have different characteristics or connections.

COMPATIBILITY

Select the valve based on MPN 13236 and compatibility with the machine’s chemical circuit. The safest confirmation is the parts list and comparison with the removed component.

[faq]

Why does the chemical valve have a PTFE insert?|The PTFE insert is the valve’s working surface and helps it shut off reliably, especially with chemical exposure where other materials can wear faster or “stick.”

Does “no chemical draw” always mean the valve is faulty?|No. Common causes include a clogged hose, suction filter, air leaks in the line, or incorrect system setup. The valve becomes a suspect only after basic causes on the chemical side are ruled out.

What can cause uncontrolled chemical suction?|Most often the valve doesn’t close properly (wear of the working surface/insert), or there are issues with other components in the chemical circuit. The symptom is chemical being drawn even when set to run without detergent.

Can I use another valve that “looks similar”?|Not recommended. Chemical circuits differ in connections and how the valve operates. The safest selection is by MPN 13236 and comparison with the removed part.

What should I check after replacing the chemical valve?|Connection tightness, stable chemical draw, and the ability to fully shut chemical off. Also check hose and suction filter cleanliness so the new valve isn’t exposed to contamination.

[/faq]