Sanitary globe valves are used as a linear motion regulator in applications that require sterile operations. These sanitation valves have founded globular shaped bodies and are designed to withstand extreme temperature ranges and deliver cycles in high-pressure system applications. Sanitary valves meet good manufacturing practices as well as medical, health, and food standards. They feature clean-polished surfaces, site disinfection, and non-toxic sealing.
Their Operating Principles
Sanitary globe valves have a minimalist design which makes them easy to clean and maintain. They can be operated either manually or automatically. When operated manually, the stem features a stainless steel or plastic handwheel that must be turned to produce the perpendicular movement which restricts the flow. In automated globe valves, double-acting or single-acting pneumatic actuators control the shafts.
As the spacing between the disk and seat ring gradually changes, a globe valve will have a throttling ability. When the fluid travels through the valve it changes direction a lot of times and increases the pressure. This valve can be used in a variety of applications where pressure and temperature limits are not exceeded. Also, it is used when the process doesn’t require special materials to fight corrosion. Usually, globe valves are installed with the steam vertical and the fluid stream connected to the pipe side above the disk to maintain a tight seal during a full valve closure. If the valve is open, this positioning allows the fluid to flow through the space between the disk’s edge and the seat.
Components of a Globe Valve
A globe valve has a very distinct globe shape. The valve, stem, disk, and the handwheel are its body’s moving parts. Below are the components of a globe valve:
- Body. The body and flow pipes of a globe valve are rounded and smooth to allow system flow without making noise or turbulence. Globe valves are available in three body types namely, angle, design, Y-shaped, and Z-shaped.
- Trim. This component includes the disk and seat ring. The disk goes into the seat ring to stop the fluid flow through the system. The disk can be ball, composition, or plug disk.
- Stem connections. The stem connects the disk and handwheel. To make this connection, the disk can be slipped over the stem or screwed into it.
- Seats. A globe valve seat can be integrated with or screwed into the body of the valve. The seating arrangement of most globe valves offers a seal between the stem and bonnet.
- Valve actuator. This operates the disk and steam to open and close the valve.