7.1975.0 Thermostatic Element | Kaeser SK‑SX Screw Compressor

Part 7.1975.0 is wax‑pellet thermal‑expansion thermostatic insert element for Kaeser SK‑SX series oil‑injected rotary screw compressors. It is installed inside the oil circuit manifold to regulate lubricant oil flow: short‑loop bypass oil to accelerate warm‑up in cold start‑up condition; gradually divert oil flow toward oil cooler once oil reaches target opening temperature.

Three typical real‑world failure modes for this wax‑pellet element, many technicians only know fully‑stuck faults and overlook thermal‑drift failure:

1. Stuck closed: Oil cannot flow to oil cooler, triggers repeated high‑temperature shutdown alarm.

2. Stuck open: Oil always flows through cooler, oil cannot reach normal operating temperature, condensed water accumulates inside oil sump and leads to lubricant emulsification & bearing corrosion.

3. Thermal‑drift (partial aging, hardest to diagnose): Element does not fully seize, but opens at wrong temperature value. Causes intermittent high‑temp alarm or persistent low oil‑temperature without obvious complete failure.

Critical buying warning: Part‑number 7.1975.0 alone cannot guarantee compatibility. Different hardware revisions of SK / SX series may use thermostatic elements with different opening temperature set‑points. Always submit full compressor serial‑number for our technical cross‑verification before placing your order.

★Important note: This is wax‑pellet thermal‑expansion insert, NOT bimetallic type. It is NOT true plug‑and‑play. After mechanical replacement, you need to observe cold‑start warm‑up curve and full‑load oil‑temperature performance to confirm correct function. If over‑temperature remains after element swap‑out, you need to inspect oil cooler, cooling fan and radiator clogging status first.

Manufacturer Part Number：7.1975.0

Applicable Compressor：Kaeser SK‑SX series oil‑injected rotary screw compressor

Information suggested before quotation:

1. Full compressor serial‑number

2. Confirm existing failure symptom: high‑temp trip / low oil‑temp / intermittent temperature drift

Reference opening temperature: 71°C‑75°C (subject to compressor hardware revision)

1. Control oil‑circuit temperature for reliable compressor operation

Wax‑pellet expands and contracts following lubricant temperature, automatically switching oil‑bypass / cooler‑loop. Prevents both high‑temperature oil carbonization and cold‑start‑up water‑condensation risk. Protects main air‑end bearings and rotor profile.

2. Reduce secondary component damage risk

Correct oil‑temperature control slows oil degradation, reduces carbon‑sludge build‑up inside oil circuit, extends service life of oil filter and oil‑separator element.

3. Direct‑fit insert‑style replacement

Matching outer dimension for original manifold housing. Must replace the complete matching O‑ring sealing set together with element. Re‑using aged O‑rings will cause internal oil bypass and function failure.

4. Resistance against normal oil‑circuit working environment

Specially formulated wax‑pellet and metal housing withstand circulating hot compressor‑oil, pressure fluctuation inside Kaeser SK‑SX oil manifold.

5. Restore stable temperature regulation after element aging

Thermostatic wax‑pellet is a wearing consumable; long‑term thermal cycles will lead to performance decay. Installing new 7.1975.0 element restores original oil‑temperature regulating performance.

This 7.1975.0 thermostatic insert serves industrial facilities running matched Kaeser SK‑SX screw compressors:

‑ General manufacturing & metal‑working workshops

‑ Automotive assembly & painting facilities

‑ Plastic processing factories

‑ 24‑hour continuous‑run light‑industry compressed‑air stations

Evaluate element replacement if you meet: repeated high‑temperature shutdown; compressor cannot reach normal operating oil‑temperature; intermittent unstable oil‑temperature readings without obvious cooler / fan fault.

Safety Warning: Strictly perform full LOTO lock‑out‑tag‑out procedure. Shut‑down compressor completely, release oil‑manifold pressure and wait full cooling before manifold disassembly. Hot lubricant may cause severe burn injury.

1. Pre‑installation preparation

Power‑off and depressurize compressor. Disassemble thermostatic manifold housing. Take out old 7.1975.0 element. Clean carbon‑sludge and sediment inside manifold cavity thoroughly.

Mandatory step: Discard all aged O‑ring seals. Install brand‑new matched O‑ring set together with new thermostatic element. Re‑used seals will create hidden internal bypass.

2. Element mounting work

Place new 7.1975.0 wax‑pellet element and new O‑rings into manifold cavity, follow original assembly orientation. Re‑assemble manifold housing, apply correct torque value per Kaeser service‑manual; avoid over‑torque manifold thread damage.

3. Mandatory post‑replacement temperature observation (Most‑skipped step)

Restore oil‑circuit connection. Start compressor and run complete observation cycle:

‑ Cold‑start phase: monitor oil‑temperature rising speed, confirm normal short‑loop bypass function;

‑ Full‑load stable running: monitor steady‑state oil‑temperature, verify element switches to cooler‑loop at target opening‑temperature.

4. Troubleshooting hint after replacement If high‑temperature alarm still occurs after installing brand‑new 7.1975.0 element: do not judge element defective directly. Re‑inspect oil cooler fouling status, cooling fan rotation, radiator dust clogging and oil quality condition.

Q1: Is 7.1975.0 plug‑and‑play after bolt‑on installation?

A: No. Mechanical installation is only part of work. You need to run cold‑start and full‑load cycles, observe actual oil‑temperature curve to verify thermostatic function.

Q2: After installing new 7.1975.0 element, compressor still triggers high‑temperature trip‑out, why?

A: Fault may not come from thermostatic element. Common root‑causes: clogged oil cooler, defective cooling fan, heavy carbon‑sludge contamination inside oil circuit. Inspect those components before judging element failure.

Q3: What failure symptoms indicate 7.1975.0 element needs replacement?

A: Three main symptoms: ① Repeated high‑temperature shutdown (element stuck closed); ② Oil‑temperature cannot rise to normal set‑point, risk of oil emulsification (stuck open); ③ Intermittent unstable oil‑temperature caused by thermal‑drift partial aging.

Q4: Can I reuse old O‑rings when replacing thermostatic element?

A: Not recommended. Aged O‑rings degrade under long‑term hot‑oil cycle, will create internal oil‑bypass inside manifold. Always fit complete set of new matching O‑ring seals.

Q5: Does part‑number 7.1975.0 fit every Kaeser SK‑SX compressor?

A: No. SK‑SX hardware revisions may adopt different opening‑temperature thermostatic inserts. Submit full compressor serial‑number for compatibility cross‑check before ordering.

‑ Pre‑order compatibility evaluation: Submit compressor serial‑number. Our technical team cross‑check element opening‑temperature and hardware fitment before shipment to prevent mis‑fit.

‑ Pre‑shipment visual inspection: Check wax‑pellet element physical integrity and matching O‑ring set condition before packing.

‑ Flexible global logistics: Urgent express delivery for emergency breakdown maintenance; sea‑freight for bulk‑project procurement.

‑ Technical‑reference support: Provide installation‑observation checklist for technician reference after order confirmation.

Request Technical Quotation for 7.1975.0 Thermostatic Element

📞 Tel: +86-18992995984

📧 infor@aircompressorglobal.com

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