Sleeve Single-Seat Control Valve

Summary:The valve seat features a sleeve-type opening structure, allowing both the sleeve and the valve core to provide dual-stage regulation of the medium, thereby minimizing damage to the valve's internal components caused by flash vaporization, cavitation, and erosion. This valve is ideally suited for applications requiring excellent shutoff performance and clean fluid control in environments where cavitation is likely to occur.

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Product Details

Overview

The valve features a simple structure and a straight-through, arc-shaped flow path, ensuring excellent flow capacity. It consists of components such as the valve body, valve seat, valve core, stem, packing gland, and bonnet. The flow path is designed in an S-shaped streamline, offering minimal pressure drop loss, high flow rate, and a wide adjustable range.
The valve core is equipped with a dedicated guide sleeve, featuring 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, offering advantages such as a compact design, small footprint, lightweight construction, substantial 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 between the valve's upstream and downstream sides 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 corrugated pipe	Carbon steel, stainless steel	The length of expansion varies depending on temperature levels.
	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 PS series		Input signal 4–20 mA.DC, wiring 2-1/2 NPT

Features

The valve seat features a sleeve-type opening structure, allowing both the sleeve and the valve core to provide dual-stage regulation of the medium, thereby minimizing damage to the valve's internal components caused by flash vaporization, cavitation, and erosion. This valve is ideally suited for applications requiring excellent shut-off performance and clean fluid control in environments where cavitation is likely to occur.

Main technical parameters Main technical parameters

Nominal diameter: DN25 to DN250 mm

Nominal pressure: PN 1.6–6.4 MPa, ANSI 125–600

Flow characteristics: Linear, equal-percentage; Flow coefficient Cv: 0.01–400

Leakage Class: (Hard Seal) Class IV, (Soft Seal) Class VI; Adjustable Ratio R: 30:1

Connection methods: Flanged type, welded type

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

Keywords: Sleeve Single-Seat Control Valve

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