Z3 Single Spring Mechanical Seal

The Qixing Z3 single spring mechanical seal is the direct-fit replacement for any centrifugal pump with a G9 (DIN 24960) seal cavity — the seat profile found on most modern European-style pumps in HVAC, water treatment, chemical dosing and food-grade transfer service. Shaft sizes cover 10mm to 80mm across more than 30 standard model codes.

Construction is a single coil spring with an O-ring secondary seal, rated to -20°C to +180°C, 1.0 MPa and 15 m/s. The G9 wedge seat seats directly in the pump housing without adapters, while the bi-directional spring lets the same Qixing Z3 mechanical seal serve clockwise and counter-clockwise pumps interchangeably — cutting MRO inventory in half.

Every Qixing Z3 mechanical seal is machined, lapped and assembled under one roof. OEM pump builders source us for private-label volume; MRO distributors stock our Z3 seals for fast aftermarket replacements; and direct buyers get factory-gate pricing on wholesale Qixing Z3 mechanical seal orders. Request a quotation for any Z3 size, face combination or O-ring elastomer.

Product Parameter (Specification)

Operating Envelope & Materials

Dimensions Chart (all sizes in mm)

Product Feature And Application

Configurations By Duty

Every Qixing Z3 mechanical seal can be ordered in five standard face material pairings, each tuned to a specific pump service. Buyers specify the configuration at order time — there is no extra tooling charge for swapping pairs within the standard catalogue.

• Ceramic / Carbon — Clean Water & HVAC duty. Lowest-cost configuration for general-service clean and lightly contaminated water; the default choice for HVAC chilled-water and condenser pumps.
• Silicon Carbide / Carbon — Sewage & Mild Abrasives. SSiC stationary face resists particulate wear in wastewater, drainage and lift-station pumps where Ceramic would chip.
• Silicon Carbide / Silicon Carbide — Hot Oil & Thermal Fluids. Self-lubricating SiC/SiC pair handles dry-running incidents and pairs with FKM O-rings for thermal oil duty up to +180°C.
• Tungsten Carbide / Carbon — Mild Chemicals. TC stationary face resists weak acids, alkalis and solvents in chemical dosing pumps and process transfer skids.
• Tungsten Carbide / Tungsten Carbide — Severe Duty. TC/TC face pairing for the most demanding wholesale Z3 mechanical seal applications, including slurry and aggressive process media.

Industries Served

• HVAC plant rooms — chilled water, condenser water and hot water circulation pumps
• Municipal water and wastewater treatment — booster, transfer and lift-station duty
• Chemical processing — dosing pumps and moderately corrosive transfer skids
• Food, beverage and dairy — CIP loops and product transfer with EPDM O-rings
• Pharmaceutical — USP-grade transfer pumps in API and intermediate handling
• OEM pump manufacturing — wholesale Z3 mechanical seal supply for private-label builds

Production Details

Every Qixing Z3 mechanical seal carries a lot number traceable back to raw material certificate, machining batch, lapping report and final inspection record. Buyers requesting Certificate of Conformity or material test certificates receive a full documentation package with each shipment — one reason OEM pump builders and MRO distributors choose Qixing as their long-term Z3 mechanical seal supplier.

On the shop floor, seal faces are lapped to ≤ 0.0009 mm flatness on monochromatic light tables; spring loads are checked against a master gauge; O-ring durometer is verified per incoming batch. Rejected parts are scrapped, not reworked — quality on Z3 seals is binary, not negotiable.

Stock sizes ship in 3-7 days; OEM custom orders in 15-25 days. Each Qixing Z3 mechanical seal is bagged with desiccant and packed in plain or buyer-branded cartons depending on the order. Contact Qixing for a same-day Z3 mechanical seal quotation, sample pricing or bulk wholesale discount.