Diaphragm Valve Manufacturer In USA

Diaphragm Valve Manufacturer in USA

SVR Global is a diaphragm valve manufacturer in USA supplying isolation and control valves for water treatment, chemical processing, pharmaceutical, biotechnology, semiconductor, food, slurry and corrosive-fluid applications.

A flexible diaphragm separates the process medium from the stem, bonnet and actuator. This construction reduces the number of wetted moving components and provides a clean, controlled flow path.

How does a diaphragm valve work?

The diaphragm is connected to a compressor and stem. Rotating the handwheel or operating the actuator moves the diaphragm towards or away from the seating surface.

When the diaphragm is pressed against the weir or body seat, the valve closes. When the diaphragm is lifted, the flow passage opens.

Because the diaphragm separates the fluid from the operating mechanism, the design is suitable for corrosive, abrasive, high-purity and contamination-sensitive media.

Diaphragm valve types

Weir-type diaphragm valve: The body has a raised internal weir. It provides reliable closure with relatively short diaphragm travel.

Straight-through diaphragm valve: The flow passage is more open and is suitable for slurry, viscous fluids and suspended solids.

Manual diaphragm valve: Operated using a handwheel.

Pneumatic diaphragm valve: Uses a pneumatic actuator for automated operation.

Electric actuated diaphragm valve: Uses an electric linear actuator.

Sanitary diaphragm valve: Designed to minimise dead space and support cleaning or sterilisation.

Size range

Industrial valves: ½ inch to 12 inches, DN15 to DN300.
Sanitary valves: ¼ inch to 6 inches.
Larger lined or fabricated valves: Available according to the application.

Pressure ratings

PN6, PN10, PN16, PN25, ASME Class 125, Class 150 and selected higher-pressure designs depending on body material, diaphragm support and valve size.

Diaphragm valves are generally used at lower pressure classes than forged ball or gate valves. The maximum allowable pressure normally decreases as the valve size increases or operating temperature rises.

Materials

Body materials: cast iron, ductile iron, ASTM A216 WCB, ASTM A351 CF8/CF8M, SS304, SS316, polypropylene, PVC, CPVC, PVDF.

Body-lining materials: natural rubber, hard rubber, soft rubber, neoprene, EPDM, nitrile rubber, butyl rubber, PTFE, PFA, ETFE, PVDF.

Diaphragm materials: EPDM, NBR, neoprene, natural rubber, butyl rubber, FKM, PTFE-faced EPDM, PTFE-faced elastomer, FDA-compatible EPDM.

Stem and compressor materials: SS304, SS316, coated carbon steel, ductile iron, engineered polymer.

SVR Global supplies cast iron, ductile iron, stainless steel, lined-plastic and polypropylene body arrangements for water, chemical and high-purity service.

End connections

Raised face flanged, flat face flanged, threaded NPT, threaded BSP, socket fusion, butt fusion, solvent socket, sanitary clamp, tube weld and union connections can be supplied.

Flanged valves can follow ASME B16.5 or EN 1092-1. Sanitary connections can be configured for hygienic process-piping requirements.

Why choose a diaphragm valve?

A diaphragm valve provides:

• Separation of the process medium from the stem and bonnet
• Bubble-tight shutoff with a suitable diaphragm
• Corrosion-resistant lined construction
• Low contamination risk
• Suitability for slurry and suspended solids
• Manual and automated operation
• Replaceable diaphragm
• Good cleanability in sanitary configurations

Operation

Handwheel, pneumatic actuator and electric actuator options are available.

Pneumatic actuators can be double acting, fail open or fail closed. Electric actuators can provide on-off or modulating control.

The actuator must not apply excessive closing force because over-compression can reduce diaphragm life.

Applications

Diaphragm valves are used in water and wastewater treatment, chemical dosing, acid and alkali service, pharmaceutical production, semiconductor water systems, food processing, slurry handling and sterile process systems. SVR Global specifically positions the range for water treatment, chemical processing, semiconductor fluid handling and sterile processes.

Standards and testing

Diaphragm valve design: MSS SP-88.
Pressure-temperature design: ASME B16.34 where applicable.
Flanged ends: ASME B16.5.
Testing: API 598 or project-specific test procedures.
Potable water: NSF/ANSI 61 when specified.
Diaphragm compliance: FDA-compatible materials when required.

Testing can include hydrostatic shell testing, seat-leakage testing, actuator functional testing, diaphragm integrity checks and visual inspection of body lining.

SVR Global manufactures diaphragm valves with cast iron, ductile iron, stainless-steel, plastic and lined bodies. Buyers should provide the fluid concentration, operating temperature, pressure, required lining and diaphragm material before selection.

Pressure Relief Valve Manufacturer in USA

SVR Global is a pressure relief valve manufacturer in USA supplying automatic pressure-protection valves for water systems, industrial pipelines, process equipment, pumping stations, utility networks, chemical plants, compressed-air systems and pressure-control installations.

A pressure relief valve remains closed during normal operation. When the system pressure rises above the adjusted or specified limit, the valve opens and discharges fluid from the protected system. Once the pressure returns to an acceptable level, the valve closes automatically.

Pressure relief valves protect pipelines, pumps, vessels and other equipment from pressure conditions that could cause leakage, mechanical damage, interruption of service or rupture.

How does a pressure relief valve work?

The operating principle depends on the valve design. A direct spring-loaded valve uses system pressure acting against a disc or piston. When the force created by the inlet pressure exceeds the spring force, the disc lifts and releases fluid.

A pilot-operated pressure relief valve uses a smaller pilot valve to control the pressure acting on the main valve diaphragm or piston. When the system reaches the adjusted pressure, the pilot changes the control pressure and causes the main valve to open.

The valve must be selected according to the required relieving capacity, inlet pressure, discharge pressure, backpressure, fluid type and operating temperature.

Pressure relief valve types

SVR Global supplies direct-acting pressure relief valves, pilot-operated pressure relief valves, diaphragm-operated relief valves, pressure relief and sustaining valves, thermal relief valves, water pressure relief valves and project-specific industrial relief valves.

Direct-acting valves are suitable for relatively simple pressure-protection duties. Pilot-operated designs can provide improved pressure control for larger flow rates, larger valve sizes and water-distribution systems.

Pressure relief and sustaining valves can be used to prevent upstream pressure from falling below a specified value while also relieving excessive pressure when required.

Size range

Available sizes: DN50 to DN350, approximately 2 inches to 14 inches, additional sizes available according to the valve design and project specification.

SVR Global’s standard pressure relief valve range currently includes DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 and DN350.

Pressure ratings

PN ratings: PN16, PN25, PN40.

Additional ratings: ASME Class 150, Class 300 and higher project-specific ratings can be considered according to valve design, material, size and applicable code.

The maximum working pressure must be confirmed against the valve size, body material, diaphragm design, flange rating and operating temperature.

Materials

Body materials: cast iron, ductile iron, ASTM A216 WCB carbon steel, ASTM A351 CF8 stainless steel, ASTM A351 CF8M stainless steel.

Cover materials: cast iron, ductile iron, carbon steel, stainless steel.

Disc materials: cast iron, ductile iron, carbon steel, SS304, SS316.

Diaphragm materials: EPDM, NBR, FKM.

Pilot valve materials: SS304, SS316, brass, bronze.

Stem and shaft materials: SS304, SS316.

Spring materials: SS304, SS316, spring steel.

Seat materials: EPDM, NBR, FKM, stainless steel, bronze.

SVR Global’s standard configuration includes cast iron, ductile iron, carbon steel and stainless-steel body options, EPDM or NBR diaphragms, stainless-steel or brass pilot components and SS304 internal parts.

End connections

Raised face flanged, flat face flanged, threaded NPT, threaded BSP, grooved and project-specific connections can be supplied.

Flanged connections can be manufactured according to ASME B16.5, ASME B16.47, EN 1092-1 or AWWA dimensional requirements depending on the application.

Pressure relief valve versus pressure reducing valve

A pressure relief valve protects the upstream system by opening when pressure becomes too high.

A pressure reducing valve remains active during normal operation and maintains a lower controlled pressure downstream.

The two products perform different functions and should not be substituted for one another.

Selection information

The buyer should provide inlet pressure, normal operating pressure, required relief pressure, maximum system pressure, required discharge capacity, fluid, temperature, outlet pressure, backpressure, pipeline size, end connection and body material.

For pilot-operated water valves, the engineer should also provide minimum flow, maximum flow, surge conditions, pump capacity and required pressure adjustment range.

Installation

Pressure relief valves should be installed in the orientation specified in the approved manufacturer drawing. The inlet pipe should be adequately sized and should not create excessive pressure loss.

The discharge connection should be routed to a safe location and sized to prevent unacceptable backpressure.

Isolation valves should not be installed in a position where the protected equipment can remain isolated from its relief device during operation, unless the system design and operating procedure specifically permit this arrangement.

Standards

Pressure and body design: ASME B16.34 where applicable.

Pressure-relieving systems: API 520, API 521 where applicable.

Flanged relief valves: API 526 where applicable.

Pressure relief devices: ISO 4126 where applicable.

Water control valves: AWWA standards according to valve type.

Testing: API 598, AWWA testing requirements or approved project procedures.

The exact code depends on whether the valve is a water-system diaphragm relief valve, industrial spring-loaded valve or pilot-operated process relief valve. SVR Global’s pressure-relief page identifies ASME, API and ISO pressure-protection standards as important selection references.

Testing

Testing can include hydrostatic body testing, seat leakage testing, relief-pressure setting verification, pilot-function testing, diaphragm integrity testing, operational cycling, flow-capacity verification and material inspection.

SVR Global supplies pressure relief valves with project-specific pressure settings, body materials, diaphragm materials, pilot arrangements and end connections.

What information is needed to quote a pressure relief valve?

Provide the valve size, inlet and outlet pressure, required relief setting, maximum flow, fluid, temperature, pressure class, body material and end connection.