Sanitary Diaphragm Valve for Hygienic Fluid Control, PTFE/EPDM Hygienic Diaphragm Valve

Product Overview

Kingman Fluid presents our premium stainless steel sanitary diaphragm valve – a flow control solution engineered specifically for high‑purity and aseptic processes. Its unique weir‑type diaphragm design completely separates the fluid chamber from the actuator, fundamentally eliminating the risk of cross‑contamination. The valve is available with manual handwheel, pneumatic actuator, or electric actuator, making it suitable for a wide range of industries where hygiene and product purity are paramount, including pharmaceutical manufacturing, biotechnology, food and beverage production, cosmetics, and fine chemicals.

Superior Materials and Precision Craftsmanship

The valve body is manufactured from industry‑recognised SUS316L stainless steel, with an electro‑polished internal surface finish of Ra≤0.4μm. This smooth, non‑porous surface resists corrosion, withstands high temperatures, and prevents microbial adhesion, fully complying with FDA and GMP sanitary standards. For less demanding applications, we also offer SUS304 stainless steel bodies. Our precision casting process ensures accurate dimensions, smooth surfaces, and a compact structure, free from casting defects such as sand holes or bubbles, which guarantees long‑term operational reliability. The seamless flow path design eliminates dead corners and prevents media residue, further safeguarding product purity.

The Core Hygienic Advantage – Diaphragm Sealing System

The defining feature of this valve is its diaphragm isolation design, which uses no packing gland. The flexible diaphragm acts as a complete barrier between the fluid and the actuator, achieving zero contamination, zero dead leg, and zero external leakage. When the stem is pressed down, the diaphragm seals tightly against the weir, providing bubble‑tight shut‑off. When the stem is lifted, the diaphragm retracts and opens a full‑bore flow path for unrestricted passage. This design is fully compatible with CIP (Clean‑in‑Place) and SIP (Sterilise‑in‑Place) processes, allowing online cleaning and sterilisation without dismantling the valve – significantly reducing maintenance downtime and operating costs.

Flexible Actuation Options

We offer three actuation methods to match your process requirements. Manual operation is straightforward and economical, ideal for local control in small‑scale production. Pneumatic actuators are available in spring‑return (single‑acting, which automatically returns to the fail‑safe position upon air failure) and double‑acting versions, which provide fast switching (cycle time 0.5‑1 second) for frequent on‑off duties. The actuator body can be supplied in aluminium alloy or stainless steel. Electric actuators, offered in 24V DC, 110V, or 220V AC versions with position feedback, are perfect for integration into automated control systems.

Wide selection of Diaphragm Materials (FDA and USP Class VI Certified)

To accommodate different media and process temperatures, we provide a range of diaphragm materials. EPDM (ethylene‑propylene‑diene monomer) operates from ‑10°C to 120°C; it is flexible, cost‑effective, and well‑suited for food applications and CIP/SIP cleaning. The PTFE/EPDM compound diaphragm resists strong acids and alkalis, offers a broad temperature range up to 150°C, and is ideal for corrosive fluids. Food‑grade silicone (VMQ) is non‑toxic, odourless, and heat‑resistant, making it the preferred choice for dairy and pharmaceutical applications in the ‑40°C to 150°C range. For the most demanding environments, FFKM (perfluoroelastomer) withstands temperatures up to 250°C and aggressive chemicals, ensuring long service life in high‑end biopharmaceutical processes.