造纸与纸浆生产中的制浆蒸煮和漂白工段，常接触高浓度氢氧化钠、氯气、二氧化氯及双氧水。普通金属阀门可能穿孔、密封失效或泄漏。山东龙飞提供衬里球阀和蝶阀方案，以全隔离技术减少腐蚀。
工况与问题
主要用于化学品储罐进出料、酸碱计量添加、漂白剂输送及大口径循环水。介质腐蚀性强且密封要求高；粘稠药液容易引起启闭卡涩，大口径设备则常安装维护困难。
全包覆隔离
高压注塑将阀体内部、关闭件和阀杆包覆于PTFE、PFA等衬里中，隔离腐蚀性介质与金属基体。
密封与轻量化
氟塑料低摩擦、自润滑，便于关闭件与阀座紧密配合；光滑衬里减少结疤粘连。衬里蝶阀结构紧凑、轻量、流阻小，适合大口径管路。
EQVC衬塑球阀
阀体与执行机构连接保证动作稳定；倒装阀轴防止吹出；阀腔与填料函由衬里隔离。口径DN15–DN200，压力PN10–PN25/ANSI Class 150，温度−30°C至180°C，泄漏VI级。碳钢或不锈钢加PTFE阀体，球体阀座为不锈钢加PTFE或PTFE，法兰连接。
EDVC衬塑蝶阀
内嵌氟橡胶密封，阀体下轴与阀杆衬里包覆，耐蚀轴套隔离介质，PTFE密封保护阀杆。省去压盖法兰，执行器直接连接。DN50–DN600，PN6/10/16或ANSI Class 150；PFA温度−30°C至180°C，PTFE为−30°C至150°C；泄漏IV–VI级，线性特性，法兰或对夹连接。
两系列可配活塞气缸、电气或智能定位器及过滤减压阀。以工艺和选材为造纸企业提供经济的防腐屏障，支持长期稳定运行。
产品规格表
| 参数 | 原文规格 |
|---|
| 型号 | EQVC |
| 标准 | GB/T 4213-2024, effective July 1, 2025; HG/T 20592/20615-2009; ANSI/ASME B16.5-2009 |
| 口径 | DN15–DN200 |
| 压力等级 | PN10–PN25; ANSI Class 150 |
| 温度范围 | −30°C to 180°C |
| 泄漏等级 | VI |
| 阀体 | 碳钢或不锈钢加PTFE |
| 球体与阀座 | 不锈钢加PTFE或PTFE |
| 连接 | 法兰 |
| 附件 | Piston cylinder, electropneumatic or smart positioner, filter regulator |
| 参数 | 原文规格 |
|---|
| 型号 | EDVC |
| 标准 | GB/T 4213-2024; HG/T 20592/20615-2009; ANSI/ASME B16.5-2009 |
| 口径 | DN50–DN600 |
| 压力等级 | PN6/10/16; ANSI Class 150 |
| PFA温度范围 | −30°C to 180°C |
| PTFE温度范围 | −30°C to 150°C |
| 泄漏等级 | IV–VI |
| 阀体、蝶板与阀座 | 碳钢或不锈钢加PTFE或PFA |
| 流量特性 | 线性 |
| 连接 | 法兰或对夹 |
| 附件 | Piston cylinder, electropneumatic or smart positioner, filter regulator |
Corrosion resistance directly affects production stability in pulp and paper mills. Cooking and bleaching stages handle aggressive media such as concentrated sodium hydroxide, chlorine, chlorine dioxide and hydrogen peroxide. Conventional metal valves can suffer perforation, seal failure and leakage.
Shandong Longfei offers lined ball and butterfly valves for these applications, using full isolation of the process medium from the metal substrate.
1. Critical duties and common problems
The solution is intended for chemical-storage tank inlets and outlets, acid and alkali dosing, bleach transfer and large-diameter circulating-water lines. These applications combine corrosive media with demanding sealing requirements. Direct contact with chemicals can corrode metal components, viscous fluids can obstruct movement, and large lines can make heavy equipment difficult to install and maintain.
2. Fully lined wetted components
High-pressure molding applies PTFE or PFA fluoropolymer lining around the internal body surfaces, closing member—the ball or disc—and stem. This creates a physical barrier between the corrosive medium and the metal substrate, addressing corrosion at its source.
3. Sealing, free movement and compact construction
The low friction and self-lubricating properties of fluoropolymers help the closing member fit tightly against the seat. The article describes bidirectional tight sealing and smooth lining surfaces that resist deposits and sticking from paper-process chemicals.
Lined butterfly valves also offer compact construction, low weight and low flow resistance, making them practical for larger pipe sizes.
EQVC lined ball valve
The body-to-actuator connection supports stable movement. A bottom-entry stem resists blowout, while full lining of the cavity and packing gland isolates the body from corrosive media.
| Parameter | Published specification |
|---|
| Model | EQVC |
| Standards | GB/T 4213-2024, effective July 1, 2025; HG/T 20592/20615-2009; ANSI/ASME B16.5-2009 |
| Nominal size | DN15–DN200 |
| Pressure rating | PN10–PN25; ANSI Class 150 |
| Temperature range | −30°C to 180°C |
| Leakage class | VI |
| Body | Carbon steel or stainless steel with PTFE |
| Ball and seat | Stainless steel with PTFE, or PTFE |
| Connection | Flanged |
| Accessories | Piston cylinder, electropneumatic or smart positioner, filter regulator |
EDVC lined butterfly valve
An embedded fluororubber seal provides sealing strength. Lining around the lower shaft and stem, a corrosion-resistant bushing and a PTFE seal help isolate the stem from process and atmospheric corrosion. Omitting a separate gland flange allows the actuator to connect directly to the valve.
| Parameter | Published specification |
|---|
| Model | EDVC |
| Standards | GB/T 4213-2024; HG/T 20592/20615-2009; ANSI/ASME B16.5-2009 |
| Nominal size | DN50–DN600 |
| Pressure rating | PN6/10/16; ANSI Class 150 |
| PFA temperature range | −30°C to 180°C |
| PTFE temperature range | −30°C to 150°C |
| Leakage class | IV–VI |
| Body, disc and seat | Carbon steel or stainless steel with PTFE or PFA |
| Flow characteristic | Linear |
| Connections | Flanged or wafer |
| Accessories | Piston cylinder, electropneumatic or smart positioner, filter regulator |
Careful manufacturing and material selection give paper mills an economical corrosion barrier and support long-term stable operation. Address: North side of Building C3, No. 16888 Jingshi East Road, Jinan. Telephone: 0531-88263858 / 88013051 / 88110763 / 88165149.
