Single-seat control valve

Summary:The structural design is simple, with low flow resistance and strong flow capacity. It also features high adjustment precision. This valve is ideal for applications requiring excellent shut-off performance in high-, ambient-, and low-temperature environments, as well as for controlling clean fluids under medium to low pressures.

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Product Details

Overview

The valve features a simple structure with a straight-through, arc-shaped flow passage that ensures excellent flow capacity. It consists of components such as the valve body, valve seat, valve core, stem, packing gland, and bonnet. The flow passage is designed in an S-shaped streamline, offering minimal pressure drop, high flow rate, and a wide adjustable range.
The valve core is equipped with a dedicated guide sleeve, offering a large guiding area and excellent vibration resistance for smooth operation. The valve seat and valve core are precisely aligned, ensuring high adjustment accuracy. Depending on the specific application requirements, it can be fitted with either a pneumatic or electric actuator, boasting features such as a compact design, small footprint, lightweight construction, robust output force, and highly responsive performance.
Due to the valve's design, which features only one valve core and valve seat, the valve core experiences a significant unbalanced force during fluid flow. Therefore, this series of valves is primarily suited for applications where minimal leakage is permitted and where the pressure difference before and after the valve is relatively small. They can be widely used to control fluids under a variety of different pressure and temperature conditions.

Structural Form

Flow Characteristics

Major Components and Supporting Materials

Valve	Components	Structural Type	Material package	Note
	Valve body	Straight-through single-seat spherical body	Carbon steel, stainless steel, alloy steel	Casting, forging, welding
	Valve core	Plunger Parabola	Stainless steel, special alloy steel	Special requirement: Surfacing welding or spray coating treatment
	Valve seat	O-type external thread	Stainless steel, special alloy steel	Special requirement: Surfacing welding or spray coating treatment
	Valve cover	Room-temperature, elongation-type heat-dissipating metal bellows type	Carbon steel, stainless steel	The length of expansion varies depending on the temperature.
	Filler	V-shaped, O-shaped	PTFE, Flexible Graphite
	Sealing gasket	Serrated	Stainless steel, special alloy steel
	Guidance Ring	Split-type, integrated type	Carbon steel, stainless steel, alloy steel	Split-type bushing
Executive Agency	Pneumatic diaphragm multi-spring type, cylinder		Spring range (kPa): 20–100, 40–200, 80–240, 120–240
	Pneumatic diaphragm multi-spring type, cylinder		Input signal (kPa): 150–400; Positioner: 4–20 mA DC, 1–5 V
	Entirely electronic models 3610L, 3810L, and the PS series		Input signal 4–20 mA DC, wiring 2-1/2 NPT

Features

The structural design is simple, featuring low flow resistance and strong flow capacity. It also boasts high adjustment precision. This valve is ideal for applications requiring excellent shut-off performance—specifically in scenarios involving clean fluids at high, ambient, or low temperatures, as well as medium- and low-pressure conditions.

Main Technical Parameters

Nominal diameter: DN20–DN300 mm

Nominal pressure: PN1.6–6.4 MPa, ANSI 150–600

Flow characteristics: Linear, equal percentage. Flow coefficient Cv: 0.05–1400

Leakage Level: (Hard Seal) Class IV, (Soft Seal) Class VI; Adjustable Ratio R: 50:1

Connection method: Flange type

Operating temperature: -196°C to +560°C

Keywords: Single-seat control valve

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