RTOSeries
Internal water cooling helps manage compression heat. Designed to work as part of a matched vacuum system.
内部水冷结构用于控制压缩热，与适配的前级泵组成真空系统。
Discuss a water-cooled configuration ↗CUIMAN / INDUSTRIAL VACUUM ENGINEERING
The right pump.
For your process.
Explore Roots vacuum pumps built around cooling, precision and practical maintenance.
从工艺需求出发，选择适合的罗茨真空泵。
RTO · Water cooledRTO/W · Air cooled
Original technical drawing · 2006 manual
THE PUMP RANGE
Start with your
cooling requirements.
RTO/WSeries
Air-cooled configuration with overload protection. Confirm the available model and operating envelope for your duty.
风冷配置并设过载保护，具体可供型号与适用工况须确认。RTO-W 在本网站对应资料中的 RTO/W。
Discuss an air-cooled configuration ↗
Non-contact rotors.
Controlled pressure difference.
Synchronized rotors transfer gas without touching each other or the chamber. A bypass valve limits excessive differential pressure. The pumping chamber requires no internal lubrication; the drive and seals still require lubrication.
同步反向旋转转子彼此及与泵腔不接触；旁通阀用于限制过大压差。抽气腔无需内部润滑，不代表整机无油，传动与密封仍需润滑。
Compare technical specifications参数与版本说明 ＋
Representative technical data / 代表性参数
| Model | Real (L/s) | Nominal (L/s) | Motor (kW) | Protection ΔP (Pa) | Inlet / outlet (mm) |
|---|---|---|---|---|---|
| RTO.30S | 30 | 36 | 0.75 | 5300 | 80 / 50 |
| RTO.150S | 150 | 180 | 2.2 | 5300 | 100 / 80 |
| RTO.300S | 300 | 360 | 3 | 4300 | 160 / 100 |
| RTO.600S | 600 | 720 | 5.5 | 4300 | 200 / 160 |
| RTO.1200S | 1200 | 1450 | 7.5 | 2700 | 250 / 200 |
| RTO.1800T | 1800 | 2150 | 15 | 2700 | 250 / 200 |
| RTO.2500F | 2500 | 2980 | 18.5 | 2700 | 250 / 200 |
| RTO.4000F | 4000 | 4850 | 22 | 2700 | 320 / 250 |
Ultimate pressure in the supplied tables: 0.06 Pa partial / 0.6 Pa total. The Chinese sheet defines measurement with a two-stage oil-sealed backing pump and a closed Roots-pump inlet. Listed casing temperature rise: RTO ≤26 K; RTO/W ≤52 K where specified.
极限压力为分压强 0.06 Pa、全压强 0.6 Pa；中文表注明测量条件为双级油封式前级泵且罗茨泵入口封闭。所列外表温升 RTO ≤26 K；RTO/W 在指定型号中为 ≤52 K，温升并非绝对温度。
Model & document differences / 型号及版本差异
- RTO.2500F: 15 kW in the 2006 manual; 18.5 kW in both standalone sheets.
- Chinese sheet: RTO.3800F and RTO.5000S. English sheet: RTO.900S, RTO.1800T, RTO.3300F and RTO.4000F.
- RTO.3300F noise: 86 dB(A) in the 2006 manual; 88 dB(A) in the standalone English sheet.
Reference data, not a current availability list. The supplied documents have different model coverage and unspecified issue dates, except the 2006 manual. Confirm model, frequency and configuration before ordering.
本资料为选型参考，不代表现行供货目录。除 2006 年说明书外，所提供资料未注明版本日期；型号覆盖存在差异，订购前须确认型号、频率及配置。
The combined document range is 30–5,000 L/s; it is not a single verified current product range. The English sheet warns that results vary with duty and 60 Hz operation may accelerate seal wear.
BUILT AROUND YOUR APPLICATION
What does your
process need?
Oil purification
滤油机
Vacuum evacuation and degassing within oil purification systems.
服务于滤油设备中的真空抽气及脱气环节。
Talk about this application ↗Vacuum coating
真空镀膜
Pre-evacuation and pumping support for coating vacuum systems.
与前级泵配合，用于镀膜设备预抽及真空系统。
Talk about this application ↗Chemical processing
化工
Vacuum distillation, concentration and drying with a suitably engineered system.
结合适配机组，用于真空蒸馏、浓缩和干燥。
Talk about this application ↗Freeze drying
冻干
Pumping support in freeze-drying systems with suitable vapor handling.
配合适当的蒸汽处理与前级配置，服务冻干真空系统。
Talk about this application ↗Selection depends on gas composition, vapor load, particles, pressure and backing-pump configuration. Review chemical compatibility and protection measures for each project. / 选型须结合介质、蒸汽、颗粒物及前级配置，不默认适合所有化工介质。
ENGINEERING THAT MATTERS
Explore the thinking
inside the pump.
Cooling, precision and serviceability. Six technologies described in the supplied company literature.
Direct end-cover water cooling＋
01
端盖水直冷技术
ZL 03231886.3Internal cooling chambers absorb compression heat and limit heat transfer to the end covers and transmission.
端盖内置组合冷却水箱，吸收压缩热，减少热量向前后盖及传动部分传导。
Internal pre-evacuation＋
02
内置式预排气技术
ZL 03231870.7Internal passages help evacuate residual gas from the oil housings and balance pressure with the pump chamber.
加速前后盖残余气体排出，平衡压力差，减少气体及润滑油向泵腔渗入。
Enhanced air cooling＋
03
风冷增强技术
ZL 03331349.0External fins increase the cooling surface area; suitability for operation without water depends on the duty.
通过外表面散热翅片增加冷却面积；不通水运行须结合具体型号及工况确认。
Reusable dynamic seal sleeve＋
04
动密封套再用技术
ZL 03231871.5Repositioning the seal contact area allows reuse of the sleeve where condition and configuration permit.
通过错位安装调整密封接触位置，在适用条件下重复利用轴套，方便维护。
Machining-error compensation＋
05
加工误差同步补偿技术
Proprietary technology / 专有技术Rotor machining and compensation software support profile accuracy and component interchangeability.
转子加工工艺配合误差同步补偿软件，控制型线精度并支持互换性。
Flexible assembly & positioning＋
06
柔性装拆和定位技术
Proprietary technology / 专有技术Impact-free assembly and self-centering connections help protect precision components and support smooth transmission.
免冲击装拆与自定心柔性定位，减少精密部件受损风险，支持平稳传动。
Four patent identifiers are reproduced from source [1], including ZL 03331349.0. The other two items are proprietary technologies. Current patent status is not asserted. / 四个专利号按资料原文列示，其余两项为专有技术；不对当前专利法律状态作声明。
MEET CUIMAN
Specialists in Roots.
Partners in your process.
专业制造，持续改进。
Shanghai Cuiman Vacuum Machinery Manufacturing Co., Ltd. specializes in Roots vacuum pump development and manufacturing. Its RTO water-cooled and RTO/W air-cooled product families focus on pumping efficiency, thermal control, stable operation and practical maintenance.
上海萃曼真空机电制造有限公司专注于罗茨真空泵的研发与制造。以 RTO 内水冷和 RTO/W 风冷系列为核心，持续围绕抽气效率、温升控制、运行稳定性及维护便利性进行产品改进。
Business locations in China and Japan. Enquiries welcome worldwide. Factory and annual-production figures refer to the supplied manufacturing information. / 营业地点位于中国和日本，面向全球接受业务咨询；工厂及产量数据依据已有制造资料。
Our development story / 发展历程 ＋
RTO F-version developed.开发 F 版内冷式过载保护罗茨泵。
S-version introduced in August.8 月推出 S 版，改进启动及关键部件。
More sizes. Refined manufacturing.扩展型号，更新加工设备与质量管理。
Selected T-series and vertical pumps.推出部分 T 系列和立式泵；11 种规格、20 种型号为当时历史记录。
4,000m²Approx. factory area / 工厂面积约
2,500/ yearApprox. annual production / 年产约
China + JapanBusiness locations / 营业地点
KEEP YOUR PROCESS MOVING
Choose. Operate.
Maintain.
Engineering literature emphasizes thermal stability, controlled rotor gaps, smooth transmission and accessible wear parts. No blanket life, noise-reduction or maintenance-free guarantee is made.
01 / System selection · 系统选型
Provide target pressure, pumping speed, gas composition, vapor and particle load, duty cycle, electrical frequency and cooling conditions.
请提供目标压力、抽速、介质、蒸汽和颗粒物负荷、工作周期、电源频率及冷却条件。
02 / Routine maintenance · 日常维护
Follow the model-specific manual for oil levels and cooling. The 2006 manual calls for at least monthly oil-quality checks and stopping the Roots pump before the backing pump. Isolate power before maintenance.
按对应说明书检查油位与冷却；2006 年说明书建议至少每月检查油质，停机先停罗茨泵再停前级泵。维护前隔离电源。
03 / Spare parts · 易损件支持
Source [5] lists piston rings, coupling elastomers, oil seals, O-rings, shaft bushings and bearings. Confirm fit, quantities and current pricing using the nameplate and serial number.
资料列示活塞环、梅花弹性件、油封、O 型圈、轴套及轴承；适配、数量和现行报价须依铭牌与序列号确认，历史价格不作为报价。
04 / Troubleshooting · 技术咨询
Send the nameplate, operating conditions, symptoms and photos. Installation and repairs require the applicable model instructions; this website is an overview.
咨询时提供铭牌、工况、故障现象及照片。安装和维修须依据对应型号操作说明，本网站为产品概述。
LET’S WORK ON YOUR REQUIREMENTS
Tell us what
you need to achieve.
请提供目标压力、抽速、介质和使用场景，便于沟通选型。
Email technical enquiry ↗Contact details below are from the 2006 manual and require current confirmation. / 以下联系方式来自 2006 年说明书，现行有效性待确认。
CHINA + JAPAN · GLOBAL ENQUIRIES
Shanghai Cuiman Vacuum MachineryManufacturing Co., Ltd.
上海萃曼真空机电制造有限公司
18 Huanzhen Road, Huqiao Industrial Zone,
Zhelin Town, Fengxian, Shanghai, China · 201417
Technical / 技术支持
+86 21 57451660
+86 13901984044 · +86 13916508380
After-sales / 售后
+86 21 57457526 / 57451660
Fax: +86 21 57457005
Source documents & editorial notes / 资料来源与编制说明
- 资料-公司简介及专利.docx
- 与其他品牌的差异.docx
- 数据-罗茨泵技术参数.pdf, p.1
- Technical+data+for+Cuiman+Pumps.pdf, pp.1–2
- 萃曼易损件.docx
- S版RTO系列罗茨泵使用说书（英文）.pdf, Ver 2.1 (2006), PDF pp.1–13
Factory area, annual production, markets and priority applications: user-supplied information. No certifications, customer names or additional export markets have been added. Technical figures require configuration confirmation. Prepared October 2026.