Archive for category: Valve

Fisher 3661 Electro-Pneumatic Positioner

Fisher Electro-Pneumatic Positioner is used with various actuators on sliding-stem valves for throttling applications. These rugged positioners provide a valve position proportional to a pneumatic input or a standard milliampere DC input signal received from a control device.

What is a Valve Positioner?

As a common control valve accessory, the valve positioner delivers pressurized air to the valve actuator so that the position of the valve stem or shaft corresponds to the setpoint from the control system. Valve positioners are typically pneumatic or analog I/P and are used when a valve requires throttling action. They require position feedback from the valve stem or shaft and deliver pneumatic pressure to the actuator to open and close the valve

Pneumatic Valve Positioners

Legacy processing units may use pneumatic pressure signaling as the control setpoint to the control valves. In a common pneumatic positioner design, a pneumatic input signal is received from a control device and modulates the supply pressure to the control valve actuator, providing an accurate valve stem or shaft position that is proportional to the pneumatic input signal.

Analog I/P Valve Positioners

Most modern processing units use a 4 to 20 mA DC signal to modulate control valves. This introduces electronics into the positioner design and requires that the positioner convert the electronic current signal into a pneumatic pressure signal (current-to-pneumatic or I/P). In a typical analog I/P positioner, the converter receives a DC input signal and provides a proportional pneumatic output signal through a nozzle/flapper arrangement. The pneumatic output signal provides the input signal to the pneumatic positioner.

Features

• Positioner design provides accurate, fast-responding instruments able to withstand the vibrations of most plant environments. Low steady-state air consumption contributes to efficient operation.
• Easily adjustable gain and damping adjustments fine-tune the positioner stability to specific application requirements.
• The positioner accepts a standard milliampere DC input signal from a control device. This positioner provides split range capabilities and adjustable zero and spans.
• Most of the parts for 3661 positioners are interchangeable; requiring fewer spare parts to support these positioners.
• The case and cover are designed to withstand mechanical vibration and rough handling.
• Zero and span adjustments can be made with the cover in place.
• To support diagnostic testing of valve/actuator/positioner packages with the FlowScanner™ valve diagnostic system, connectors, piping, and other hardware can be installed between the 3661 positioner and the actuator.

Fisher Electro-Pneumatic Positioner Specifications

Area Classification

• Intrinsically Safe
• Non-incendive
• Dust

Certifications

• CSA
• FM
• ATEX
• IECEx
• CUTR
• Peso
• KGS
• INMETRO
• RCM

Communication Protocol

• 4-20mA Analog

Diagnostics

• No

Input Signal

• Electric

Max Outlet Pressure

• 90 psi

Mounting Type

• Actuator Mounted

Operating Temperature

• Standard Temperature

Position Control

• Modulating

Safety Certification

• NIL

Supply Media

• Air

Other Configurations

• Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.

RISING STEM BALL VALVES Flowserve

Valbart RSBV Rising Stem Ball Valves are the oil and gas industry’s choice for applications requiring a mechanically energized metal or soft seat to prevent losses from process contamination or material leakage. They are ideal for frequent cycling.

The RSBV uses a unique helix system that opens and closes the valve without rotation. The linear only operation of the stem makes it an excellent choice for frequent cycling. Each linear operation, from opening to closing and back again, is a friction-free movement between seat and ball that significantly reduces valve wear and keeps routine maintenance to a bare minimum. The outside yoke and screw, with stuffing box-type gland packing, including gland and gland flange, eliminates the need for special tools when adjusting or repacking the stem seal. Top entry convenience allows visual inspection inside the valve without removing the valve from the pipeline. The stem also has a backseat to prevent possible blowouts and repacking stem seals under pressure when the valve is fully open. A special lapping technique applied to the Stellite6® ball and seat sealing areas allows for zero seat leakage. Heavy wall thickness provides extra corrosion allowance to reduce wear and extend the valve lifetime

Industries

• General Industry
• Chemicals
• Water
• Oil & Gas
• Power
• Basic (Organic & Inorganic)
• Biofuels
• Petrochemicals
• Waste Water
• Agriculture
• Upstream Exploration & Production
• Midstream Transportation
• Downstream Processing
• Conventional Steam

Standards

• API 6D/API 6FA-607/FCI 70-2
  NACE MR0175/API 598

Size Range

• DN 25 to 600
• NPS 1 to 24

Pressure Class Range

• PN 10 to 320
• Class 150 to 2500

Seating Material

• Metal or soft

Features and Benefits

• Extended service life and low maintenance costs due to unique helix coil stem design, which enables friction-free opening and closing
• Improved product quality, efficiency, and safety with tightness performance up to ANSI FCI-70-2 Class VI
• Easy in-line inspection and maintenance enabled by top-entry design
• Reduced corrosion due to heavy wall thickness in excess to ASME/ANSI B16.34
• Improved personnel safety from blowout-proof stem that meets international standards of API 600 and 6D

Other Features

• Combination of a quarter-turn ball valve with a linear movement of non-rotating stem
• Trunnion mounted design
• Reduced or full bore
• Single-seat (no valve body cavity)
• Unidirectional or bidirectional
• Metal to metal seat with stellite welding overlay (soft seat insert on request)
• Outside screw and yoke for adjusting of stem packing
• Blowout proof stem
• Suitable for very high frequent cycling operations (switching valves)
• Tight shut-off by means of application of external mechanical force and not dependent on differential pressure
• Proper selection of materials to avoid galling and high friction
• Protected lower trunnion against solid particles intrusion
• Clearance control to consider high/low-temperature shrinkages
• Self-cleaning closure member

Data Sheet

CRANE globe valves

CRANE globe valves are highly efficient for services requiring frequent operation and throttling when pressure drop across the valve is about 20% of inlet pressure.

Closer throttling, creating higher pressure drops may cause cavitation or excessive velocities which could cause high noise levels, vibration and possible damage to the valve or adjacent piping. Globe valves can be equipped with optional operators and are available with a variety of trims to match service requirements.

CRANE globe valves are supplied as standard with contour or spherical type plugs and are classified as quick opening on flow curves

Features & Benefits

• All seat rings are seal welded as standard
• Quality process fully documented, materials fully traceable
• Full range of special trims and options available

Typical Industries and Applications

• Energy – Power Production, Oil & Gas, Refining, District Heating
• Processing – Chemical Processing, Pulp & Paper, Food & Beverage, Petro Chemical
• Other Industries – Marine, Waste Water, Mining, OEM, others

Globe Valves

Globe valves are ideal for throttling service. Their flow characteristics permit accurate and repeatable flow control. However, caution must be exercised to avoid extremely close throttling when pressure drop exceeds 20%. This creates excessive noise, vibration and possible damage to valves and piping. Crane does not recommend applications in excess of this due to possible damage to the valve. Gear Actuators recommended for Globe valves:

• Class 150: sizes above 6″
• Class 300: sizes above 6″
• Class 600: sizes above 4″

Globe valves are designed to close off, open up or throttle the flow in a pipeline. The disc is designed to completely stop flow and form a tight seal with pressure under the disc. In the 10% open position to full open position, globe valves are effective in throttling line pressure. NOTE: Continuous throttling at less than 10% open may cause excessive vibration, noise, wear and damage to discs and seats.

OPERATION

Most valves, which are located in an accessible environment, are actuated by a manual handwheel mounted directly on top of the valve. When the valve size or differential pressure is so great that the handwheel size cannot keep the operating handwheel pull within customer reasonable limits, then a bevel gear should be mounted on the top-works. In addition, many customers require the remote operation or operating times that are not possible with manual handwheels, in this case, Electric Motor Actuators (EMO’s) can be used.

Figure

• Globe, Flanged

Size Range:

• 2 through 12 inches
• (50 – 300 mm)

Pressure Temperature Rating

• Carbon Steel
• ASTM A216 Grade WCB
• 285 psi -20°F to 100°F
• (20 bar -28°C to 37°C)

Data Sheet

Georg Fischer Butterfly Valve Wafer Type

Specifically for water applications, the Type 563 Aqua Georg Fischer Butterfly Valve operates at pressures of up to 150 PSI and can handle temperatures from 32°F to 142°F. The wetted inner body made of PVC with EPDM seals. Because of the plastic body, the Aqua Valve is lightweight and installs easily between flanges. The Aqua Valve is compatible with ANSI and DIN flanges and is available from 2″ to 12″. The Q-ring seals allow the valve to install without additional gaskets.

Butterfly valves have been around for a long time, and are used for a variety of applications. They made their first appearance during the 1930s, and have been utilized by several industries ever since. Often made out of cast iron, butterfly valve’s name is based from the functionality of its disc. There are a few different types of butterfly valves, however, they fall into two basic types – Lug and Wafer valves.

Metal butterfly valves usually use for control and on/off operations. Due to the fact, that the valves are available with different body designs (wafer or lug type) and materials, they perfectly meet the requirements of diverse applications and processes.

Type 563 Wafer Style Georg Fischer Butterfly Valve

The Type 563 Butterfly Valve shall be wafer style compatible with both ANSI B16.5 150 lb and DIN 2501 flange patterns. The disk operation shall utilize double eccentric design principles.
The shaft shall be non-wetted by a bushing assembly with double O-ring seals and fixed at both ends. The face seal shall be a Q-ring compatible with flat and serrated flange adapters. The face, disk and shaft seals shall operate independently. The wetted body and disk shall be of like materials. The handle shall be lockable with standard adjustment increments of 5 degrees. The operator mounting flange shall comply with ISO standards. All valves shall be tested in accordance with ISO9393 and designed to ISO16136 standards. All valves shall be manufactured under ISO9001 for Quality and ISO14001 for Environmental Management. Following assembly, every valve shall be tested and certified bubble-tight exceeding Class VI standards.

Size Range:

• 2″ – 12″

Pressure Rating:

• PN10 (150 PSI), Bi-directional

Joining Technology:

• Wafer

Standard Ratings:

• ANSI
• ISO-DIN

Materials:

• Polyvinyl Chloride (PVC)

Seal:

• EPDM

Fields of Application:

• Water treatment
• Power plants
• Marine
• Electroplating
• Chemical process industry
• Automotive industry
• Cooling equipment
• Aquariums
• Swimming pool construction

Advantages:

• 50% lower actuation torque compared to a centric butterfly due to the double eccentric principle
• Abrasion can be reduced noticeably
• Optimized gaskets
• Functional hand level made of glass-fiber-reinforced polypropylene (PP-GF 30) with 5° ratchet setting, lockable

Data Sheet