B1型全PTFE油封

产品参数

速度：≤18m/s

温度：-60+260℃

压力：≤30bar

材料：PTFE+碳纤

应用：工程机械、油压马达、泵、油压元件等应用

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产品优势

01减少机械故障REDUCE MECHANICAL FAILURE

使用合适的广州东晟密封油封密封件，能让您减少工程机械设备的故障几率，能保证生产效率，让机械使用寿命更长久。

02油封性能优良EXCELLENT PERFORMANCE

专注研发油封、油封修理包及油封散件，免费为客户根据需求工况设计密封方案，将其发挥密封性能，符合工作环境的需求.

应用行业

B1型全PTFE油封油封产品应用行业

B1型全PTFE油封应用行业

排版丨B1型全PTFE油封 - 广州东晟油封厂家

B1型全PTFE油封

PTFE ROTARY SHAFT SEAL TYPE B1

全PTFE唇口，耐化学介质腐蚀

FULL PTFE LIP, RESISTANT TO CHEMICAL MEDIA CORROSION

耐温-60~+260℃，可短时干运转

TEMPERATURE -60~+260℃, CAPABLE OF SHORT-TERM DRY RUNNING

摩擦系数约0.04，起动扭矩低无粘滑

FRICTION COEFFICIENT ABOUT 0.04, LOW BREAKAWAY TORQUE WITHOUT STICK-SLIP

B1型全PTFE油封为车削聚四氟乙烯唇片与金属外骨架组合的旋转轴用油封，唇口无弹簧，依靠唇片过盈与介质压力自紧，具备化学惰性、耐高温、低摩擦与可干运转特性。

Type B1 full PTFE rotary shaft seal consists of a machined PTFE lip ring and a metal outer case. The lip has no garter spring and self-energizes through interference and media pressure, offering chemical inertness, high temperature resistance, low friction and dry-running capability.

盾构机 Shield Machine

土压平衡盾构与泥水盾构的主驱动、铰接装置与螺旋输送机，常年浸泡在膨润土泥浆、砂砾与地下水中，密封部位既要承受石英砂粒的磨蚀，又要抵挡弱碱性泥浆的长期侵蚀。普通丁腈橡胶唇口在泥浆中浸泡数月后会出现体积溶胀、硬度下降，唇口贴合压力随之衰减，泥水沿主轴渗入主驱动齿轮箱，造成齿轮油乳化、轴承点蚀与减速机报废，一次开舱更换的停机成本极高。B1型全PTFE油封的全PTFE唇片对膨润土浆液、地表水与弱碱介质呈化学惰性，不溶胀、不降解，在浸泡工况下唇口几何形状与过盈量保持稳定；填充改性的PTFE唇片摩擦系数约0.04，即使泥水润滑不充分、短时缺油运转仍能维持连续密封界面，正对应主驱动低速重载、启停频繁的运行特点。金属外骨架提供刚性定心与轴向定位，抵抗PTFE在持续径向载荷下的冷流变，避免唇片随运行时间被逐渐挤入间隙。盾构掘进一旦开始便不便停机，B1型B1型全PTFE油封的长周期稳定性正是主驱动密封选型的首要考量。

The main drive, articulation device and screw conveyor of earth pressure balance and slurry shield machines are permanently immersed in bentonite slurry, gravel and groundwater. Sealing positions must withstand both the abrasion of quartz sand particles and the long-term attack of weakly alkaline slurry. Conventional NBR lips swell in volume and lose hardness after several months of immersion, so lip contact pressure decays and slurry penetrates along the main shaft into the main drive gearbox, causing gear oil emulsification, bearing pitting and gearbox scrap — a single chamber-opening replacement carries extremely high downtime cost. The full PTFE lip of Type B1 is chemically inert to bentonite slurry, groundwater and weakly alkaline media: it neither swells nor degrades, and lip geometry and interference remain stable under immersion. The filled PTFE lip has a friction coefficient of about 0.04 and maintains a continuous sealing interface even with insufficient slurry lubrication or short-term dry running, matching the low-speed, heavy-load and frequent start-stop operation of the main drive. The metal outer case provides rigid centering and axial positioning, resisting cold flow of PTFE under sustained radial load and preventing the lip from being gradually extruded into the gap. Once tunneling begins, stopping is impractical; the long-cycle stability of Type B1 is exactly the primary criterion for main drive seal selection.

施工工程 Construction Engineering

混凝土泵车、搅拌主机、旋挖钻机与摊铺机的传动轴、液压泵与搅拌轴端，直接接触水泥浆、砂石骨料与养护水。水泥浆的pH值常在12~13，属于强碱环境，并夹带莫氏硬度6~7的石英骨料；丁腈橡胶唇口在这种介质中长期运转，表面会龟裂、硬化并失去回弹，而骨架与唇口结合处也易被碱性浆液侵蚀剥离。B1型全PTFE油封的全PTFE唇片对水泥碱性浆液、混凝土外加剂与养护水完全惰性，既不溶胀也不老化，骨架采用镀锌或304不锈钢外骨架提升抗腐蚀能力，使密封在浆液包覆状态下保持结构完整。搅拌主机与泵送系统低速大扭矩运行，PTFE静、动摩擦系数接近，起动时不出现橡胶常见的粘滑跳变，轴功率损耗也明显更低。工地维修窗口短、备件更换随意，B1型的单一唇片无弹簧结构没有弹簧锈蚀失效的隐患，配合外骨架整体压装，现场更换只需套筒工具即可完成，把因密封失效造成的浆液泄漏与骨料污染降到最低，普通橡胶油封在此类碱性浆液工位通常数月即需更换，B1型可稳定支撑整个施工周期。

Drive shafts, hydraulic pumps and mixing shaft ends of concrete pump trucks, mixing hosts, rotary drilling rigs and pavers are directly exposed to cement slurry, sand aggregate and curing water. Cement slurry usually has a pH of 12 to 13, a strongly alkaline environment carrying quartz aggregate of Mohs hardness 6 to 7. NBR lips running in such media crack, harden and lose resilience, while the bond between case and lip is easily eroded by alkaline slurry. The full PTFE lip of Type B1 is completely inert to alkaline cement slurry, concrete admixtures and curing water — it neither swells nor ages — and a galvanized or 304 stainless steel outer case improves corrosion resistance, keeping the seal structurally intact under slurry coverage. Mixing hosts and pumping systems run at low speed and high torque; PTFE static and dynamic friction coefficients are close, so the stick-slip jump common to rubber does not occur at start-up and shaft power loss is clearly lower. Construction sites have short maintenance windows and parts are replaced casually; the single-lip, spring-free design of Type B1 eliminates spring corrosion failure, and with integral press-fitting of the outer case, on-site replacement only requires a sleeve tool, minimizing slurry leakage and aggregate contamination caused by seal failure. Conventional rubber seals at such alkaline slurry positions usually need replacement within a few months, while Type B1 can support the entire construction cycle.

污水处理 Sewage Treatment

曝气机、刮泥机、污泥泵、加药泵与离心脱水机的轴端，是介质条件最杂的密封工位：进水中含有硫化氢、氨氮、油脂与悬浮污泥，加药段还要面对次氯酸钠、聚合氯化铝、氢氧化钠与硫酸等强氧化或强酸碱药剂。氟橡胶对次氯酸钠等强氧化剂的耐受性有限，长期接触会出现表面劣化与硬度上升；丁腈橡胶在酸碱交替工况下更是迅速溶胀，唇口失去贴合能力，污水渗入轴承腔后造成轴承锈蚀与整机停机。B1型B1型全PTFE油封的PTFE唇片对常见酸、碱、盐与氧化性药剂均呈化学惰性，吸水率近零，在长期浸泡中尺寸与过盈量不变，避免橡胶类密封因溶胀导致的唇口压力漂移。污水处理设备多为连续运行、低速旋转，且检修需停产排空，密封更换属于计划性大修项目，因此免维护周期是选型核心；PTFE的低摩擦与干湿交替适应能力让曝气机在液位波动、短时抽空时也不至于干摩擦烧毁唇口。对加药泵这类强氧化药剂工位，B1型全PTFE结构比任何弹性体方案都更接近长期稳定解。

Shaft ends of aerators, sludge scrapers, sludge pumps, dosing pumps and centrifugal dewatering machines are the sealing positions with the most complex media: influent contains hydrogen sulfide, ammonia nitrogen, grease and suspended sludge, while the dosing stage involves strongly oxidizing or strongly acidic and alkaline agents such as sodium hypochlorite, polyaluminum chloride, sodium hydroxide and sulfuric acid. FKM has limited resistance to strong oxidizers like sodium hypochlorite and degrades at the surface with rising hardness after prolonged contact; NBR swells rapidly under alternating acid and alkali conditions, losing lip conformity, and sewage penetrates the bearing cavity causing bearing corrosion and unit shutdown. The PTFE lip of Type B1 is chemically inert to common acids, alkalis, salts and oxidizing agents, with nearly zero water absorption, so dimensions and interference remain unchanged during long immersion and the lip pressure drift caused by rubber swelling is avoided. Sewage treatment equipment mostly runs continuously at low speed, and maintenance requires shutdown and draining, making seal replacement a planned overhaul item — hence maintenance-free intervals are the core selection criterion. The low friction and adaptability to alternating wet and dry conditions of PTFE keep aerator lips from burning under dry friction during level fluctuation or brief emptying. For strongly oxidizing dosing pump positions, the Type B1 all-PTFE construction comes closer to a long-term stable solution than any elastomer option.

汽车发动机 Automobile Engine

曲轴前后端、凸轮轴、平衡轴与涡轮增压器的轴封，是现代发动机密封要求最苛刻的部位：曲轴箱温度长期处于-40~+150℃区间，曲轴颈线速度可达10~15m/s，机油中含有清净分散剂、极压抗磨剂与高温氧化产物。传统丁腈唇口依靠弹簧补偿磨损，一旦机油结焦在唇下形成硬质沉积，唇口就会被顶起渗漏；高温下橡胶压缩永久变形又会削弱贴合压力。主流发动机已大量改用PTFE唇口油封，B1型全PTFE结构正是这一技术路线的一类实现：PTFE唇片耐温-60~+260℃，在高温机油中不硬化、不结焦粘连；摩擦系数约0.04比橡胶低一个量级，可减少曲轴运转的摩擦功率损耗；静、动摩擦接近的物理特性让发动机冷启动瞬间不出现唇口粘滑与啸叫，这也是PTFE唇口在干摩擦起动阶段优于橡胶的根本原因。曲轴箱强制通风与涡轮增压带来的压力脉动，由PTFE唇片在介质压力下自紧补偿，无需弹簧即可跟随轴偏心。装配时必须使用专用导套，严禁撑开唇口，否则薄唇一旦塑性变形便无法恢复，这一点与橡胶油封的容忍度截然不同。

Shaft seals at the front and rear of the crankshaft, camshaft, balance shaft and turbocharger are the most demanding sealing positions in modern engines: crankcase temperature stays in the range of -40 to +150°C, crankshaft journal surface speed can reach 10 to 15 m/s, and engine oil contains detergent dispersants, extreme-pressure anti-wear additives and high-temperature oxidation products. Conventional NBR lips rely on a spring to compensate wear; once oil coking forms hard deposits under the lip, the lip is lifted and leakage begins, while compression set at high temperature further weakens contact pressure. Mainstream engines have widely adopted PTFE lip seals, and the Type B1 all-PTFE construction is one implementation of this technical route: the PTFE lip withstands -60 to +260°C without hardening or coke adhesion in hot oil; its friction coefficient of about 0.04 is an order of magnitude lower than rubber, reducing frictional power loss of crankshaft rotation; the physical characteristic of nearly equal static and dynamic friction eliminates lip stick-slip and squeal at cold start, which is the fundamental reason PTFE lips outperform rubber during dry-friction starting. Pressure pulsation from positive crankcase ventilation and turbocharging is self-energized by the PTFE lip under media pressure, following shaft eccentricity without a spring. A dedicated assembly sleeve must be used during fitting and the lip must never be spread open — once a thin lip is plastically deformed it cannot recover, a tolerance fundamentally different from rubber seals.

机器人行业 Robot Industry

工业机器人的谐波减速器、RV减速器、伺服电机轴端与关节输出轴，转速不高但启停频繁、正反转密集，且关节结构紧凑、拆装困难，密封寿命直接决定整机免维护周期。机器人关节对起动扭矩与背隙极为敏感：橡胶唇口的静摩擦显著高于动摩擦，每次换向都会产生粘滑跳变，即使只有零点几牛米的波动，也会被减速器放大成末端轨迹误差与振动。B1型全PTFE油封的PTFE唇片摩擦系数约0.04且几乎不随速度变化，静、动摩擦接近，从根上抑制粘滑与爬行，让关节在低速微动时保持平滑输出。机器人关节内部润滑脂量有限，微动磨损与频繁启停使唇口长期处于边界润滑状态，PTFE的低摩擦与自润滑特性正适配这一工况；其耐温-60~+260℃覆盖伺服电机端部因连续过载产生的温升，避免橡胶唇口在局部温升下硬化失去贴合。关节空间狭小、壁厚受限，B1型的薄壁金属外骨架+薄唇片结构可在有限轴向空间内完成装配，配合无弹簧设计消除弹簧锈蚀与疲劳断裂风险，使机器人关节密封与整机十年免维护的可靠性目标相匹配。

Harmonic reducers, RV reducers, servo motor shaft ends and joint output shafts of industrial robots run at moderate speed but with frequent starts and stops and dense forward-reverse cycles; joint structures are compact and difficult to disassemble, so seal life directly determines the maintenance-free interval of the whole machine. Robot joints are extremely sensitive to breakaway torque and backlash: the static friction of a rubber lip is markedly higher than dynamic friction, so every reversal produces stick-slip, and even a fluctuation of a few tenths of a newton-meter is amplified by the reducer into end-effector trajectory error and vibration. The PTFE lip of Type B1 has a friction coefficient of about 0.04 that hardly varies with speed, with static and dynamic friction close together, suppressing stick-slip and crawling at the source and keeping smooth output during low-speed micro-motion. Joints contain only a limited amount of grease; micro-motion wear and frequent starting keep the lip in boundary lubrication, exactly matching the low-friction and self-lubricating properties of PTFE. Its temperature range of -60 to +260°C covers the heat rise at servo motor ends caused by continuous overload, preventing rubber lips from hardening and losing conformity under local temperature rise. Joints have limited space and wall thickness; the thin-wall metal case and thin lip of Type B1 fit into limited axial space, and the spring-free design eliminates spring corrosion and fatigue fracture risk, aligning joint sealing with the ten-year maintenance-free reliability target of robots.

智能制造行业 Intelligent Manufacturing Industry

数控机床主轴、滚珠丝杠副、真空泵、直线电机模组与洁净室输送设备，构成了智能制造最典型的密封场景。切削液中含极压添加剂、乳化剂与防锈剂，长期高速冲刷下橡胶唇口会被添加剂侵蚀溶胀，同时切屑与磨粒在唇下堆积形成犁削沟槽；高转速主轴端线速度普遍超过10m/s，橡胶唇口摩擦热积聚后温度骤升、寿命断崖式下降。B1型B1型全PTFE油封的全PTFE唇片对乳化切削液、极压添加剂与清洗剂完全惰性，不溶胀、不析出，避免添加剂侵蚀导致的唇口软化和渗漏；摩擦系数约0.04使高线速度下的摩擦发热量大幅低于橡胶唇口，配合PTFE耐温-60~+260℃的宽温域，主轴在长时间高速运转时唇口温度始终处于材料安全区。真空泵与洁净室设备往往不允许油脂污染，PTFE的干运转能力与低发尘特性使其成为洁净工况的首选——PTFE磨损产物为细小粉体且不易粘附，不会像橡胶那样在制品表面形成黑色污染斑点。智能产线追求少停机、免维护，B1型的无弹簧、整体式外骨架结构减少了零件数量与失效模式，让主轴与丝杠的密封更换从计划性停机变为按寿命周期整体替换，与产线节拍和OEE考核的要求相匹配。

CNC machine tool spindles, ball screw pairs, vacuum pumps, linear motor modules and cleanroom conveying equipment form the most typical sealing scenarios of intelligent manufacturing. Cutting fluid contains extreme-pressure additives, emulsifiers and rust inhibitors; under long-term high-speed flushing, rubber lips are attacked and swollen by additives, while chips and abrasive particles accumulate under the lip to form plowing grooves. Spindle end surface speed commonly exceeds 10 m/s, and frictional heat accumulation in rubber lips causes abrupt temperature rise and a cliff-edge drop in life. The full PTFE lip of Type B1 is completely inert to emulsified cutting fluid, extreme-pressure additives and cleaning agents — it neither swells nor precipitates, avoiding lip softening and leakage caused by additive attack. A friction coefficient of about 0.04 makes frictional heat generation at high surface speed far lower than rubber lips, and with the wide temperature range of -60 to +260°C, lip temperature stays in the material safety zone during long high-speed spindle operation. Vacuum pumps and cleanroom equipment usually prohibit grease contamination; the dry-running capability and low particle generation of PTFE make it the first choice for clean conditions — PTFE wear products are fine powders that do not readily adhere, so black contamination spots on workpiece surfaces typical of rubber do not appear. Smart production lines pursue less downtime and maintenance-free operation; the spring-free integral outer case of Type B1 reduces part count and failure modes, turning spindle and screw seal replacement from planned shutdown into whole-component replacement by life cycle, matching line takt and OEE requirements.

线速度≤20m/s，压力≤0.05Mpa，温度-60~+260℃

SURFACE SPEED ≤20M/S, PRESSURE ≤0.05MPA, TEMPERATURE -60~+260℃

唇口无弹簧，压力超过0.05Mpa时须加装支撑环；轴面粗糙度Ra 0.2~0.4μm，轴端倒角15°~20°，严禁撑开唇口装配。

Spring-free lip; a backing ring is required above 0.05 MPa. Shaft roughness Ra 0.2~0.4 μm, shaft chamfer 15°~20°, and the lip must never be spread open during assembly.

B1型全PTFE油封使用场景为：盾构机 Shield Machine、施工工程 Construction Engineering、污水处理 Sewage Treatment、汽车发动机 Automobile Engine、机器人行业 Robot Industry、智能制造行业 Intelligent Manufacturing Industry

Application Scenarios for PTFE Rotary Shaft Seal Type B1: Shield Machine, Construction Engineering, Sewage Treatment, Automobile Engine, Robot Industry, Intelligent Manufacturing Industry

广州东晟油封厂家

GUANGZHOU DONGSHENG OIL SEAL MANUFACTURER

dshseals.cn

集研发、生产、销售于一体的国家高新技术油封厂家 · 235种材料配方 · 1725种选型方案

National High-Tech Enterprise integrating R&D, Production and Sales · 235 Material Formulations · 1725 Selection Solutions

使用说明

说明丨B1型全PTFE油封使用说明 - 广州东晟油封厂家

B1型全PTFE油封使用说明

PTFE ROTARY SHAFT SEAL TYPE B1 · INSTALLATION & MAINTENANCE GUIDE

结构与材质 Structure & Material

B1型全PTFE油封为金属外骨架+车削聚四氟乙烯唇片的组合式旋转轴密封，唇片由PTFE棒料或管料车削成型（厚度通常1~2mm），外圈为碳钢镀锌或304不锈钢外骨架，提供径向刚性与座孔定位。唇口不设弹簧，密封比压依靠唇片与轴的过盈量及介质压力自紧形成，因此对同轴度与沟槽精度的要求高于弹性体油封。PTFE的吸水率低于0.01%、线膨胀系数约1.2×10⁻⁴/℃，浸液与温变下尺寸稳定；但PTFE存在无弹性回复与冷流变两个固有局限，故工业件普遍采用碳纤维、石墨或玻纤填充改性，以提升抗挤出能力与耐磨性。

Type B1 is a combined rotary shaft seal consisting of a metal outer case plus a machined PTFE lip ring. The lip is turned from PTFE rod or tube stock (typically 1~2 mm thick), and the outer ring is a galvanized carbon steel or 304 stainless steel case providing radial rigidity and bore location. The lip is spring-free; sealing contact pressure comes from lip-to-shaft interference and media pressure self-energizing, so concentricity and groove accuracy requirements are stricter than for elastomeric seals. PTFE has water absorption below 0.01% and a linear expansion coefficient of about 1.2×10⁻⁴/℃, keeping dimensions stable under immersion and temperature change. However, PTFE has two inherent limitations — no elastic recovery and cold flow — so industrial parts are generally filled with carbon fiber, graphite or glass fiber to improve extrusion resistance and wear performance.

安装要点 Installation Key Points

① 安装方向：唇口必须朝向被密封介质一侧，靠介质压力自紧；装反则唇口张开、密封比压消失。单唇结构的油封不可双向互换使用。
② 座孔与沟槽：座孔孔径公差H8，沟槽宽度公差+0.2/0mm，孔口倒角15°~20°且不得有尖角毛刺，尺寸系列参照ISO 16589 系列（含热塑性密封元件的旋转轴唇形密封圈）。
③ 轴面准备：轴面粗糙度Ra 0.2~0.4μm，不得有螺旋加工纹（PTFE唇口无弹性追随，纹路会形成泵吸渗漏）；轴端倒角15°~20°，轴径公差h11，表面硬度建议≥HRC45。
④ 同轴度与跳动：轴与座孔同轴度≤0.15mm、轴径向跳动≤0.1mm；PTFE唇片无弹性补偿能力，偏心会直接造成单侧偏磨与局部过热。
⑤ 安装工具：必须使用导套或专用套筒压装外骨架，严禁撑开、翻卷唇口；PTFE薄唇一旦塑性变形无法回弹复位，与橡胶油封的容忍度截然不同。
⑥ 预润滑：唇口与轴面涂少量清洁的工作介质，干装会在初期运转中产生唇口起毛与磨粒。

① Installation Direction: The lip must face the sealed media side and self-energize under media pressure. Reversed installation opens the lip and eliminates contact pressure. Single-lip seals cannot be used interchangeably in both directions.
② Bore and Groove: Bore tolerance H8, groove width tolerance +0.2/0 mm, bore chamfer 15°~20° without sharp edges or burrs. Dimension series per the ISO 16589 series (rotary shaft lip-type seals incorporating thermoplastic sealing elements).
③ Shaft Preparation: Shaft roughness Ra 0.2~0.4 μm, with no spiral machining marks — a spring-free PTFE lip cannot follow them and the helix will pump leakage. Shaft end chamfer 15°~20°, shaft tolerance h11, surface hardness recommended ≥HRC45.
④ Concentricity and Runout: Shaft-to-bore concentricity ≤0.15 mm, shaft radial runout ≤0.1 mm. The PTFE lip has no elastic compensation, so eccentricity leads directly to one-sided wear and local overheating.
⑤ Tooling: Press the outer case with a guide sleeve or dedicated driver; never spread or roll the lip. Once a thin PTFE lip is plastically deformed it cannot spring back, a tolerance far stricter than rubber seals.
⑥ Pre-lubrication: Coat the lip and shaft with a small amount of clean working medium; dry assembly causes lip fuzzing and abrasive debris during initial running.

工况参数 Operating Parameters

线速度：≤20 m/s（干运转或散热不良时建议降至10m/s以内）
压力：≤0.05 MPa（唇口无弹簧自紧能力有限，超过0.05MPa须加装支撑环/挡圈防止冷流变挤出）
温度范围：-60℃ ~ +260℃（短时可至+280℃，超出后PTFE分解速率上升）
摩擦系数：约0.04~0.10（静、动摩擦接近，起动无粘滑）
适配介质：矿物油、合成油、水、酸碱溶液、溶剂、氧化性药剂、切削液
不推荐介质：熔融碱金属、元素氟、部分卤代烃溶剂（如氟化清洗剂）、高PV值且无散热的持续干摩擦工况

Surface Speed: ≤20 m/s (reduce to under 10 m/s for dry running or poor heat dissipation)
Pressure: ≤0.05 MPa — a spring-free lip has limited self-energizing capability; above 0.05 MPa a backup ring is required to prevent cold-flow extrusion.
Temperature Range: -60℃ ~ +260℃ (short-term up to +280℃; above this the PTFE decomposition rate rises)
Friction Coefficient: about 0.04~0.10 (static and dynamic values are close, with no stick-slip at start-up)
Compatible Media: Mineral oils, synthetic oils, water, acid and alkali solutions, solvents, oxidizing agents, cutting fluids
Not Recommended: Molten alkali metals, elemental fluorine, certain halogenated hydrocarbon solvents (e.g. fluorinated cleaners), and continuous dry friction at high PV values without heat dissipation

维护周期 & 失效排查 Maintenance Schedule & Failure Diagnosis

维护周期：
· 常规工况（清洁介质、温度平稳）：每12个月检查一次
· 严苛工况（磨蚀颗粒、酸碱药剂、高温或高速）：每6个月检查一次
· 检查内容：唇口是否偏磨、起毛、碳化变色；唇片是否被挤出沟槽；轴面是否拉伤；是否有介质外泄

常见失效与排查：
· 唇口装反 → 介质沿唇口直接外泄，按唇口朝向介质侧重装
· 唇口被撑开/翻卷 → 安装时未用导套，PTFE无法回弹，只能整件更换
· 单侧偏磨 → 同轴度或径向跳动超差，校正座孔与轴系跳动
· 唇片被挤出 → 压力超过0.05MPa或间隙过大引发冷流变，降压并加装支撑环
· 唇口碳化变色 → 持续高温或润滑缺失，降低温度并改善润滑
· 轴面起沟槽 → 轴面粗糙度超差、有螺旋纹或硬度过低，重磨轴面至Ra 0.2~0.4μm

Maintenance Schedule:
· Normal Conditions (clean media, stable temperature): inspect every 12 months
· Severe Conditions (abrasive particles, acid/alkali agents, high temperature or high speed): inspect every 6 months
· Inspection Items: one-sided wear, fuzzing or carbonization of the lip; lip extrusion from the groove; shaft scoring; media leakage

Common Failures & Diagnosis:
· Reversed Lip → Media leaks directly along the lip. Reinstall with the lip facing the media side.
· Lip Spread or Rolled → Installed without a guide sleeve; PTFE cannot spring back, so replace the whole seal.
· One-sided Wear → Concentricity or radial runout out of tolerance. Correct bore and shaft runout.
· Lip Extruded → Pressure above 0.05 MPa or excessive clearance causing cold flow. Reduce pressure and fit a backup ring.
· Lip Carbonized/Discolored → Sustained high temperature or lack of lubrication. Lower temperature and improve lubrication.
· Shaft Grooving → Roughness out of tolerance, spiral marks or insufficient hardness. Regrind shaft to Ra 0.2~0.4 μm.

B1型全PTFE油封适用行业：盾构机 Shield Machine、施工工程 Construction Engineering、污水处理 Sewage Treatment、汽车发动机 Automobile Engine、机器人行业 Robot Industry、智能制造行业 Intelligent Manufacturing Industry

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