Industrial valves · Клапан диафрагмы Samson — арматура для точного регулирования потоков

Engineering Overview: Baihu Butterfly and Diaphragm Valves for Complex Industrial Media

Engineering Analysis of Baihu Butterfly Valves: Design Variations

EV Group China presents Baihu butterfly valves, designed for reliable operation in industrial pipeline systems with high operational loads. The design adapts to specific technical tasks and operating conditions, offering several key configurations:

1. Standard Butterfly Valves (centric):

  • The operating principle is based on the rotation of a symmetrical disc by 90° around its axis. The hydrodynamically optimized disc shape minimizes the local resistance coefficient (ζ) and prevents cavitation and flow turbulence, ensuring high throughput.

2. Valves with Elastomeric (Soft) Seat:

  • The use of high-quality polymer seals (EPDM, NBR, Viton) ensures absolute tightness class "A" according to GOST 9544-2015. This modification is an optimal engineering solution for gaseous media and systems where complete leakage exclusion is required.

3. Valves with 'Metal-to-Metal' Sealing:

  • The design with precisely lapped metallic sealing surfaces is intended for operation in conditions of extreme temperatures and high pressures. This solution is indispensable when working with abrasive, crystallizing, and chemically aggressive media.

Baihu shut-off valves, supplied by EV Group China, are a key element in critical industries:

  • Water treatment and wastewater systems: Guarantee durability and reliability in treatment plants and municipal networks.
  • Steam-condensate systems and CHP plants: Demonstrate high resistance to superheated steam and cyclic temperature loads.
  • Main and distribution gas pipelines: Ensure complete tightness, essential for transporting natural gas and other hydrocarbons.
  • Chemical industry: Application of corrosion-resistant steels (AISI 316, 321) and special alloys (Hastelloy, Monel) for working with acids, alkalis, and other aggressive reagents.

Key Operational Advantages of Baihu Valves

  • Optimized flow path: The full-bore design minimizes pressure losses and hydraulic resistance in the system.
  • Extended service life: The use of certified materials and strict adherence to production technologies guarantee a long service life for the valves.
  • Guaranteed tightness class: Precise machining of sealing surfaces and the use of modern materials ensure compliance with standards for hazardous and toxic media.
  • Integration versatility: A wide selection of body, disc, and seal materials allows for integration of valves into any technological system.

Design and Engineering Advantages of Baihu Diaphragm Valves

The Baihu diaphragm valve, supplied by EV Group China, is a high-tech shut-off and regulating device where the control mechanism is completely isolated from the working medium by an elastic diaphragm. Its design includes the following elements:

  1. Body: Made of corrosion-resistant steel grades (e.g., 12X18H10T, AISI 316L) or specialized alloys resistant to chemical attack.
  2. Diaphragm: The key sealing element separating the flow and the actuator. Made from chemically resistant elastomers (EPDM, FKM) or fluoroplastic (PTFE).
  3. Seat: A precisely machined surface inside the body (weir), ensuring a tight fit of the diaphragm in the closed position.
  4. Actuator: Various configurations are available: manual control (handwheel), pneumatic or electric actuator for integration into automated process control systems (APCS).

Key differences from traditional shut-off valves:

  • Absolute tightness: The design eliminates stagnant zones, and complete isolation of the actuator from the flow prevents external leaks and media contamination.
  • Chemical resistance: Ideal for working with viscous, abrasive, crystallizing, and aggressive media, minimizing the risk of jamming and corrosion of moving parts.
  • Maintainability: Simplified maintenance: diaphragm replacement is performed without disassembling the valve body from the pipeline, which reduces downtime.

Frequently Asked Engineering Questions about Baihu Diaphragm Valves

What is the operating principle and purpose of a diaphragm valve?
This is a type of shut-off valve in which the flow is blocked by pressing an elastic diaphragm against a special weir (seat) in the body. The main feature is the complete isolation of the actuator mechanism from the working medium.

How is flow control achieved?
Control is achieved via a stem connected to the diaphragm. When the stem moves downwards, the diaphragm deforms and tightly presses against the seat, completely blocking the flow. In the reverse movement, the passage opens.

What types of actuators are used for Baihu diaphragm valves?
EV Group China supplies Baihu valves with manual control via a handwheel, as well as with automated actuators: pneumatic (single- and double-acting) and electric, compatible with modern APCS systems.

By what criterion is the diaphragm material selected?
The selection of the diaphragm material (PTFE, EPDM, FKM, etc.) is critically important and depends on the chemical aggressiveness of the working medium, its temperature, and operating pressure. Correct selection guarantees durability and chemical compatibility.