Valves
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Screwed Valve

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What are the main differences between a screwed gate valve, globe valve and non-return valve (NRV)?

A screwed gate valve is a linear motion valve that will move its gate up or down to control fluid flow. Fluids must move in a straight line when they pass through these valves hence it is mainly used where a straight-line flow of fluid is necessary. Screwed Gate Valves are commonly used in systems that handle low-pressure and non-hazardous fluids.

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On the other hand, a globe valve works by having a plug or disc moving across the flow path perpendicular to that direction. The flow control with this type is known to be highly precise because it uses linear motion for its plug hence making throttling and modulation possible. Globe valves find utility in industries requiring accurate flow control such as power plants, oil & gas or water treatment facilities.

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Screwed Valves

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A non-return valve, also known as a check valve, is designed to allow fluid flow in only one direction while preventing backflow. Non-return valves (NRVs) are usually installed in order to ensure that fluid flows in one particular direction and avoid the risk of the opposite flow that would lead to damages or interfere with the normal intended operations of systems unlike globe and gate valves which are mainly utilized for regulating flows. They are frequently used in plumbing systems, water supply networks, and pumping stations.

How does a screwed gate valve function, and what are its typical applications?

To control fluid flow through these valves, a Screwed Gate Valve uses a threaded stem and a flat rate. As the handle of the valve is turned, it drives up or down the threaded stem within the valve body, thereby opening or closing the passage. A fully open position ensures that there is no obstruction on fluids as all gates remain retracted completely. Conversely, when fully closed, this gate blocks fluid from flowing through.

Screwed gate valves are most appropriate where straight-line fluid flow is required and flow control is not a primary concern. These types of valves are used in low-pressure systems, including those that handle non-hazardous fluids such as water, air or certain gases. This simplicity and reliability make them applicable in various sectors such as residential plumbing systems including commercial plumbing works; irrigation systems and general fluid control applications requiring full bore passage.

Screwed Valve Specification

Size 1/4", 3/8", 1/2", 3/4", 1", 1 1/4", 1 1/2", 2", 2 1/2", 3", 4"
Temperature 0 Deg C - 1200 Deg C
Body , Chest Solid One piece casting of Cast Iron Fg 260, Cast Steel Gr WCB ,CF8,CF8M.
Seat Integral to Body, Soft, Optional.
Thread Sizes 1/4" to 4"
Temperature range -20°C to 120°C (subject to configuration)
Pressure rating PN20 (BSP) and Class 150 (NPT)
Application & uses Petroleum production and refining
Industrial process applications
HVAC (heating, ventilation and air conditioning systems)
Piping and Plumbing
Paper and Pulp Production
Power generation
Food and beverage processing.

Screwed Valve Stock Availability

Screwed Non-Return Valve

Screwed Non-Return Valve

When pressure conditions may normally result in reversed flow, a non-return valve is installed to ensure that a medium flows through a pipe in the correct direction.

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Screwed Globe Valve

Screwed Globe Valve

A globe valve is a type of valve used to control flow in a pipeline that differs from a ball valve in that it has a moveable plug or disc element and a stationary ring seat in a usually spherical body.

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Screwed Gate Valve

Screwed Gate Valve

A gate valve is a control valve that either lets fluid flow through unhindered or shuts it down. The primary benefit of a gate valve is the straight, unobstructed path, which results in the least amount of pressure loss over the valve.

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Screwed Valve Component Name

Screwed Valve Component Name
NO. PART MATERIAL ASTM, DESIGNATION
1 Body Cast Iron A 126 Class B
2 Bonnet Cast Iron A 126 Class B
3 Yoke Cast Iron A 126 Class B
4 Disc Seat Ring Bronze B 62
5 Body Seat Ring Bronze B 62
6 Disc Cast Iron A 126 Class B
7 Hand Wheel Nut Steel A 307 Grade B
8 Stem Brass B 124
9 Hand Wheel Cast Iron A 126 Class B
10 Bonnet Gasket Non Asbestos Sheet F 104P 1141 A
11 Bonnet Body Bolt Steel A 307 Grade B
12 Bonnet Body Nut Steel A 307 Grade B
13 Packing Carbonized Fiber D 4102
14 Hand Wheel Washer Bronze B 62
15 Yoke Sleeve Bronze B 62
16 Gland Cast Iron A 126 Class B
17 Gland Bolt Steel A 307 Grade B
18 Gland Nut Steel A 307 Grade B
19 Yoke Bonnet Bolt Steel A 307 Grade B
20 Yoke Bonnet Nut Steel A 307 Grade B

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Screwed Valves Applications and Uses

  • Distillery Plants
  • Sugar Industries
  • Process Industries
  • Power Plants
  • Refineries
  • Petrochemical Plants
Distillery Plants

Screwed Valves in Distillery Plants

Sugar Industries

Screwed Valves in Sugar Industries

Process Industries

Screwed Valve in Process Industries

Power Plants

Screwed Valve in Power Plants

Refineries

Screwed Valve in Refineries

Petrochemical Plants

Screwed Valve in Petrochemical Plants

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