DWA031-050 Wafer Type Butterfly Valve with Pin DN50
DWA031-050 is a DN50 wafer type butterfly valve with a pin-fixed disc, designed for on-off and throttling service in water and low-pressure industrial lines. It clamps between two pipe flanges, eliminating the need for separate valve flanges and minimising face-to-face length. The pin connection ensures the disc remains centred during repeated cycling, reducing the risk of leakage compared to friction-fit designs.
| Model Code | DWA031-050 |
|---|---|
| Product Type | Wafer type Butterfly Valve with Pin DN50 |
| Category | Wafer Type Butterfly Valves |
| Manufacturer | Tianjin MIC Valve Co., Ltd. |
| Size and Pressure Rating | Confirmed on quotation |
| Certification | ISO 9001 and ISO 14001 certified plant |
| Model | DWA031-050 |
| Valve Type | Wafer type butterfly valve with pin |
| Nominal Diameter | DN50 |
| Connection | Wafer, clamped between pipe flanges |
| Operation | Quarter-turn, lever or actuator |
| Series | DWA031 wafer butterfly valve series |
What This Model Gives You
- Short face-to-face length allows installation in tight spaces where gate valves would not fit
- Pin-fixed disc-to-stem connection transfers torque reliably under repeated open-close cycles
- Wafer body clamps between existing pipe flanges, reducing material and installation costs
- Quarter-turn operation enables quick visual confirmation of valve position
- Resilient seat provides bidirectional sealing, allowing installation in either direction
- Part of a valve programme certified to ISO 9001 and ISO 14001
Problems It Removes
- Gate valves are too long and heavy for the space between flanges in retrofit or space-constrained layouts
- Friction-fit disc-to-stem connections loosen and leak after thousands of cycles
- Multiple valve brands on a single project complicate spare parts inventory
- Small-diameter valves are often delayed due to being treated as non-standard items
- Buyers need a single supplier capable of delivering both small and large diameter valves in the same series
Where It Is Installed
- Isolation of pump suction and discharge lines in municipal water systems
- Zone shut-off on building fire protection and service water risers with limited flange spacing
- Throttling control in low-pressure cooling water circuits of power plant auxiliary systems
- Batch isolation on process water headers in chemical and pharmaceutical facilities
- Balancing and control in district heating secondary circuits operating at low pressure
Buyers It Suits
- Water utility contractors purchasing DN50 isolation valves in project volumes
- Pump and skid system builders requiring a compact valve within a fixed frame
- HVAC and fire protection installers standardising on quarter-turn isolation valves
- Valve distributors stocking a wafer butterfly range from DN50 upward
- EPC buyers sourcing medium- and low-pressure valves for water and heating projects
How It Is Built
- Wafer body clamped between pipe flanges using through bolts
- Disc fixed to the stem with pins rather than a friction fit
- Resilient seat lining providing bidirectional shut-off
- Quarter-turn stem suitable for lever, gearbox, or actuator operation
- Part of the DWA031 wafer butterfly valve series covering larger nominal diameters
Material Selection
- Body, disc, stem, and seat materials are confirmed per order based on the buyer's medium and temperature
- Seat and disc variants follow the options available across the DWA wafer series
- Material certificates are issued with the order upon request
How It Is Made
- Body casting inspected and machined using in-house fine machining equipment
- Disc and stem machined and pinned as a matched assembly
- Seat fitted and closure member adjusted for centred travel
- Assembled valve cycled and pressure tested before packing
- Marked, wrapped, and crated for container shipment from Tianjin
How It Is Checked
- Dimensional check of body face-to-face length and flange bolt pattern before assembly
- Seat and shell tightness testing on the assembled valve
- Operating torque and full quarter-turn travel verified on every unit
- Testing performed on the 10 sets of imported inspection and testing equipment
- Records maintained under the ISO 9001 quality management system
Certificates Issued With This Valve
- ISO 9001 quality management system certification
- ISO 14001 environmental management system certification
Certification statements are limited to the management system certificates the factory actually holds. Product-level approvals for your market are confirmed before order.
What Can Be Changed
- Seat and disc variant selected based on the medium in the buyer's system
- Lever, gearbox, pneumatic, or electric actuator fitted before shipment
- Flange drilling matched to the standard used on the buyer's pipework
- Private label marking and packaging available on OEM orders
- Mixed-diameter orders combined with other valves in a single container
How It Compares With the Alternatives
| DN50 resilient seated gate valve | The gate valve offers a full bore but is significantly longer and heavier for the same application |
|---|---|
| Lug type butterfly valve | The lug body supports end-of-line service; the wafer body requires flanges on both sides and cannot be used as a pipe end closure |
| Wafer butterfly valve with half shaft | The half-shaft version simplifies the stem but the pinned disc provides more direct torque transfer under heavy cycling |
| Ball valve at DN50 | A ball valve offers tighter sealing at higher pressure but has higher cost and requires more clearance for handle sweep |
Installing and Operating This Valve
- Confirm the flange standard and bolt pattern on both pipe flanges before ordering
- Leave the disc slightly open while inserting the valve between flanges to avoid seat damage
- Tighten through bolts evenly in a cross pattern to ensure the body seats squarely
- Open the disc fully once bolts are tight and verify free quarter-turn operation
- Do not use the wafer body as a pipe end closure during pressure testing
- Cycle the valve periodically on lines that remain in one position for extended periods
Related Models Industries and Guides
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Sectioning valves non-return protection and joints for distribution mains pumping stations and treatment works.
Heat Supply
District heating primary and secondary circuit isolation balancing and expansion.
How To Choose Between Wafer and Lug Butterfly Valves
The body style decides whether the valve can hold the line on its own. Here is how to pick without guessing.
Installing a Wafer Butterfly Valve Between Flanges
The installation sequence that avoids seat damage, disc fouling and leaking joints on first pressure test.
DWA031-050 Wafer Type Butterfly Valve with Pin DN50 FAQ
What size and pressure rating is DWA031-050?
It is a DN50 valve in the DWA031 wafer series. The pressure rating and flange standard are confirmed against your line data when we quote, as the same body is offered in multiple seat and drilling variants.
Can this valve be used at the end of a pipe run?
No. A wafer body requires pipe flanges on both sides to clamp against. For dead-end or end-of-line service, request the lug type body instead.
Which materials are used for the body, disc and seat?
Material selection depends on the medium and temperature on your line, so we confirm the combination with the quotation and issue material certificates with the order on request.
Can it be supplied with an actuator instead of a lever?
Yes. The stem accepts a lever, gearbox, or pneumatic or electric actuator, and the valve is assembled and tested with the actuator fitted before shipment.
Do you supply the larger diameters in the same series?
Yes. The DWA wafer butterfly range continues through larger nominal diameters, and our valve programme covers DN10 to DN2600 across all families.
What certification does the factory hold?
Tianjin MIC Valve Co., Ltd. is certified to the ISO 9001 quality management system and the ISO 14001 environmental management system.
How do I get a quotation?
Send the model, quantity, flange standard, and medium by WhatsApp or email, and our sales engineers will reply with a quotation and a confirmed specification sheet.
Get a Price for DWA031-050 Wafer Type Butterfly Valve with Pin DN50
Tell us the quantity, flange standard and the medium on your line. You get a quotation with a confirmed specification sheet, not a catalogue page.