Choose the product review for your sealing task
These are different purchasing tasks. Identify the installed sealing arrangement before asking for a replacement; neither catalogue establishes an approved cylinder or valve configuration by machine name alone.
Define compound, spring and geometry together
The official site identifies 宁波量子密封有限公司 in Yuyao and describes PTFE product development/manufacture. Its spring-seal page distinguishes PTFE/UHMWPE bodies and different springs/styles. [1] [3] This is a sealing-component offer, not a complete hydraulic cylinder or universal machine retrofit.
| Selection input | Information to supply | Proposal to request |
|---|---|---|
| Installed geometry | Shaft/bore/gland drawing, tolerances and actual clearance | Selected profile, size and installation requirements |
| Motion | Static, reciprocating or rotary; actual speed/cycle | Suitable style with an operating envelope for that duty |
| Media and conditions | Fluid/gas, contaminants, pressure/vacuum and temperature across the cycle | Exact compound and spring material with compatibility basis |
| Acceptance | Leakage/friction and relevant service objectives | Sample validation method and measured acceptance limits |
Reported equipment suggests questions, not completed tests
The company and workshop pages describe mixing, forming/pressing, sintering, machining and surface-treatment equipment, alongside optical measurement, tensile, oil-seal/radial-force and thermal-analysis tools. [1] [2] Their counts are supplier statements, not audited capacity or an actual seal test.
Compound identity
Ask for the selected polymer formulation/material identifier and traceability. “PTFE” alone does not define every filled compound.
Process and geometry
Request the actual route and final measurement record for the proposed profile and gland.
Application evidence
Ask which test reproduces the relevant media, motion and combined pressure/temperature duty, and what it measured.
No machine photograph is treated as calibration evidence, and no company-wide equipment list proves the offered sample passed acceptance. Current order-specific compliance and material declarations need their actual issuing entity, scope and records.
Do not combine unrelated catalogue maxima
The spring page’s broad introduction and style table use different temperature, speed and pressure guidance. HSS is separately described for static/vacuum contexts and much lower shaft surface velocity than USS/CSS. [3] Select one construction and request its supported combined envelope.
- Rotary duty
- Record shaft diameter, speed, pressure and temperature together, plus lubrication and mating surface condition.
- Reciprocating duty
- Record stroke/cycle, direction, media and actual pressure/temperature changes.
- Static or vacuum duty
- Define media, pressure direction/range, geometry and the actual leakage objective.
Parker’s engineering guide explains interacting pressure/velocity/temperature and spring-load effects in its own products. [5] It supports asking for a combined assessment; its curves and ratings are not QuanSeaL evidence or interchangeability approval.
Read the dated certificate, not the page label
The displayed ISO 9001:2015 / GB/T 19001-2016 image names Ningbo Liangzi and plastic-seal design/production, with a shown expiry of 14 May 2026. It is expired as displayed. The page also presents a separate IATF image; its issuer/scope/current status has not been authenticated. [4] Request current issuer-verifiable documents for the actual site and order. A management-system image does not establish a seal’s media compatibility or simultaneous operating limits.
Validate the selected seal in the defined arrangement
- 1
Controlled selection
Record the full profile/material/spring designation, size, drawing and permitted conditions. Resolve open/closed-gland installation and required surface details.
- 2
Representative sample
Agree test fixture/application conditions and measurable leakage/friction/functional acceptance, with actual sample identity.
- 3
Repeat-order control
Preserve compound and spring identity, geometry, agreed lot evidence and approval for relevant changes.
The trial is a proposed buyer/supplier agreement, not a witnessed test or a promised service life. CivilEquip has not inspected the factory or measured seal leakage.
Send the gland and operating cycle
Sources for this company
- Liangzi company and equipment description
Ningbo Liangzi identity, Yuyao address and reported forming/sintering/machining/measurement equipment. Not witnessed plant capacity.
Checked: 2026-10-11 - Supplier workshop presentation
Company-reported process and testing equipment; no selected seal’s route, calibration or test result.
Checked: 2026-10-11 - Actual spring-energized seal descriptions
Polymer/spring options, USS/CSS/HSS rows and differing headline/style guidance; not a simultaneous application rating.
Checked: 2026-10-11 - Displayed management-system certificates
ISO image actually read: Liangzi holder, plastic-seal design/production scope, expiry 14 May 2026; separate IATF image not issuer-authenticated.
Checked: 2026-10-11 - Parker PTFE design guide, section 3.6
Primary manufacturer engineering explanation of rotary pressure/velocity, temperature and spring-load trade-offs. Its branded curves/ratings are not transferred to QuanSeaL.
Checked: 2026-10-11 - Original back-up ring family catalogue
Support function, five forms, different motion/installation restrictions and conditional pressure envelopes; separate from the spring-seal family.
Checked: 2026-10-11