DN200 Ductile Iron Swing Type Check Valve PN25

This DN200 flanged swing check valve is built for pipelines rated up to PN25 (25 bar), using a ductile iron GGG40/50 body with a minimum 250μm fusion-bonded epoxy coating internally and externally. The swing disc opens fully under forward flow and closes automatically to stop reverse flow — sized and tested to the pressures below, so you can confirm fit against your own pipeline specification before requesting a quote.

Product Dimensions and Specifications

Pressure & Testing

Product Information

How to Choose the Right DN200 Swing Check Valve

Three things determine whether this valve is the right fit for your line: pressure class, mechanical fit, and material compatibility with your fluid.

Match pressure class to your system. 

This valve is available at PN10, PN16, and PN25. Confirm your system's actual working pressure plus any surge allowance (from pump start/stop or valve closure) before selecting — an underrated valve risks shell failure under surge, while an overrated one adds unnecessary cost. Shell and seal test pressures for each class are listed in the specification table below.

Confirm face-to-face and flange drilling standards. 

This valve is manufactured to BS5153, DIN3202-F6, DIN3201-F1, or AWWA C508 face-to-face dimensions, with flange drilling to BS4504, DIN2501, or ANSI B16.1. These must match the standard your existing pipeline and mating flanges were built to — mixing standards means the valve will not physically install without adapter flanges. Tell us which standard your project specifies when you request a quote.

Choose seat and disc material for your medium. 

Disc and body seat rings are available in brass, bronze, stainless steel, or EPDM. Bronze and brass suit general fresh water service; stainless steel is the better choice for seawater or where mild chemical exposure is expected; EPDM gives a soft, tight seal for clean water and many general chemicals but is not the right choice for all media. If your line carries oils, acids, or alkalis, confirm concentration and temperature with us so we can recommend a compatible seat material rather than assuming one option covers all of these.

Swing Check Valve vs. Dual Plate Check Valve — Which Type Fits Your Line

If your priority is a compact install or reduced water-hammer risk from frequent pump cycling, review the Ductile Iron Dual Plate Wafer Type Check Valve. If your project specifies a flanged, full-bore swing check valve to BS5153/DIN3202/AWWA standards, this DN200 swing check valve is the correct match.

Installation Requirements

Install this valve horizontally, or vertically with upward flow using the spring-assisted variant — confirm which orientation applies when you order, since the standard (non-spring) disc relies on gravity to seat fully and is not intended for vertical lines without the spring option. Position the valve after pumps where possible to reduce the risk of water hammer, a common issue when check valves are placed too far from the pump or on lines with fast flow reversal. Inspect the disc annually for wear and clean epoxy-coated surfaces to maintain corrosion resistance over the valve's service life.

Applications

• Municipal water supply and distribution — full-bore design and fusion-bonded epoxy coating suit continuous water contact; confirm seat material for potable water compliance where required.

• Wastewater and sewage treatment — bronze/stainless steel seat options resist the mixed solids and moderate corrosivity typical of sewage lines.

• HVAC and fire protection systems — PN10/PN16 classes cover typical HVAC working pressures without the added cost of PN25.

• Irrigation and agricultural pumping stations — horizontal swing check placement after pumps limits water hammer from cycling pump starts.

• Industrial processing (oils, non-corrosive liquids) — confirm seat material compatibility (brass/bronze/stainless steel/EPDM) against the specific fluid and concentration before ordering; not all seat options suit all industrial media.

Manufacturing & Quality Control

Ductile iron valve bodies are produced through raw material preparation, melting, spheroidization treatment, inoculation treatment, casting, heat treatment, and mechanical processing, with quality inspection at each stage. Shanxi Solid Industrial Co., Ltd. holds ISO 9001 certification, along with CE and WRAS certification (including WRAS – Cement Mortar) at the company level. Quality inspectors check goods during production and again before shipment, and for some orders inspect the loading process at port.

Customization Options

Based on your drawings or specification, this valve can be customized in:

• Material — ductile iron GGG40/50 or cast iron GG25 for the body; brass, bronze, stainless steel, or EPDM for seats

• Size — DN50 to DN600 across the swing check valve range

• Pressure class — PN10, PN16, or PN25

• Flange standard — BS4504, DIN2501, or ANSI B16.1 drilling to match your mating flanges

• Bolt and nut material — zinc-plated carbon steel or SS304/316 for corrosive or outdoor environments

• Coating — fusion bonded epoxy (min. 250μm) or liquid epoxy painting

• Drawing-based production — our engineers can design and produce to your drawings or samples

FAQ

Q: Can this valve be installed vertically?

A: Yes, with the spring-assisted variant for upward flow. Standard horizontal installation does not require the spring option. Confirm your orientation when ordering so the correct variant is supplied.

Q: What information do I need to provide for an accurate quote?

A: Size, pressure class, governing design and flange standards, medium, installation orientation, and any required documentation (see the RFQ checklist above).

Q: What is the lead time for a DN200 order?

A: Lead time depends on order volume and any customization required; please confirm current lead time for your specific quantity when requesting a quote.

Q: Do you offer technical drawings or datasheets?

A: Yes — detailed dimensions and technical data are available on request through the inquiry form.

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