Azbil HLS Series - Chapter 1. General; Scope; Major Components of Control Valves; Structures

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Chapter 1. General
1-1. Scope
This manual covers the instructions for the following Control Valves.
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Model HLS : Small-port single-seated control valves
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Model HLC : Small-port cage guide type single-single seated control valves
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Model HTS : Top-guide single-seated control valve
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Model HSC : Cage type single-seated control valve
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Model HPS : Top-guide high-pressure single-seated control valves
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Model HAV : Venturi throat type angle control valves.
For the valve positioners, refer the following operators manuals.
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Model VPE OM2-8310-0410 Pneumatic valve positioner for small actuators
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Model HTP OM2-83 10-0200 Pneumatic valve positioner (Single Acting type)
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Model HEP 15, l6, l7 OM2-8313-0100 Electro-Pneumatic Valve Positioner (Single Acting
Type)
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Model AVP 300/301/302/200/201/202 CM2-AVP300-2001 Electro-pneumatic positioner
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Model AVP 303/203 CM2-AVP303-2001 Electro-pneumatic positioner
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Model AVP 701/702 CM2-AVP702-2001 Smart valve positioner 700 series (HART)
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Model AVP 703 CM2-AVP703-2001 Smart valve positioner 700 series
(F OUNDATION fieldbus)
1-2. Major components of control valves
Each control valve is comprised of two major components, namely, a valve body and an
actuator. Various combinations of valve body and actuator are available to meet various type
of uses with different valve sizes, pressure ratings, types of connections, types of materials, and
actuator sizes.
(For details of specifications, refer to Specification Sheets SS2-8113-0200, -0210, .0300, -0310,
-0400, and -2600.)
1-3. Structures
The structures of typical control valves are shown is Figure 1-1 through Figure 1-3.
The valve body is connected to the bonnet with stud bolts and nuts. A gasket is (two gaskets
are) provided at the connection Chapter to seal against the internal fluid or to let the valve
body make up a pressure vessel. The valve plug is supported by the guide ring and cage, and
driven by the actuator. The actuator has multiple springs and a diaphragm, and converts the
pneumatic control signal into a mechanical (positional) control signal with which to position
the valve plug.