DL3B001 Lug Butterfly Valve No Pin and Spline Spindle
DL3B001 is a lug type butterfly valve with a spline spindle and no pin fixation between disc and stem, designed for on-off and throttling service in water, low-pressure industrial, and heating systems. The lug body allows installation at the end of a pipe run or in dead-end service, where a wafer body cannot be used. The spline spindle provides positive torque transfer to the disc without relying on friction alone, which helps maintain consistent operation under repeated cycling.
| Model Code | DL3B001 |
|---|---|
| Product Type | Lug Butterfly Valve[No Pin and spline spindle] |
| Category | Lug 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 | DL3B001 |
| Valve Type | Lug type butterfly valve with spline spindle |
| Connection | Lug body with threaded inserts for through bolts |
| Operation | Quarter-turn, lever, gearbox, or actuator |
| Series | DL3B001 lug butterfly valve series |
| Nominal Diameter Range | DN10 to DN2600 mm |
| Nominal Pressure Range | 0.05 to 4.0 MPa |
What This Model Gives You
- Lug body enables end-of-line or dead-end isolation where flanges are only present on one side
- Spline spindle ensures reliable torque transfer to the disc without pin fixation
- No pin connection reduces the risk of disc misalignment during assembly or under thermal cycling
- Quarter-turn operation allows quick visual confirmation of valve position
- Bidirectional sealing with resilient seat provides tight shut-off in both flow directions
- Part of a valve programme certified to ISO 9001 and ISO 14001
Problems It Removes
- Gate valves are too long and heavy for installations with limited space at the end of a pipe
- Wafer butterfly valves cannot be used at the end of a line due to lack of flanges on both sides
- Friction-fit disc stems lose torque transfer over time and cause inconsistent operation
- Valves with pin-fixed discs can misalign during assembly or under thermal stress
- Buyers need a single supplier who can provide both end-of-line and in-line valve types
Where It Is Installed
- Isolation of branch lines in water distribution systems where the valve is installed at the end of a pipe run
- Throttling control in low-pressure heating circuits where space and access are limited
- Dead-end service in fire protection risers or standby pump lines
- Maintenance isolation in industrial process lines with single-flange ends
- Replacement of gate valves in tight spaces where a longer valve would interfere with adjacent equipment
Buyers It Suits
- Water and heating system contractors needing end-of-line isolation valves
- Pump and skid integrators specifying valves for single-flange termination points
- EPC firms sourcing valves for low- and medium-pressure industrial packages
- Valve distributors stocking lug butterfly valves for retrofit and maintenance projects
- Plant engineers replacing gate valves with shorter, lighter alternatives in confined areas
How It Is Built
- Lug body with threaded inserts for through bolts on each end
- Spline spindle connecting disc to stem without pin fixation
- Resilient seat lining for bidirectional sealing
- Quarter-turn stem for lever, gearbox, or actuator operation
- Part of a DL3B series that continues through larger nominal diameters
- Designed for use in DN10 to DN2600 mm and 0.05 to 4.0 MPa pressure range
Material Selection
- Body, disc, stem, and seat materials are confirmed per order based on the medium and temperature
- Seat and disc variants follow the options available across the DL3B lug series
- Material certificates are issued with the order upon request
How It Is Made
- Body castings inspected and machined on in-house fine machining equipment
- Disc and stem assembled with spline spindle as a matched unit
- 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 lug spacing and bolt hole 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 for the medium and temperature on the buyer's line
- Lever, gearbox, pneumatic or electric actuator fitted before shipment
- Lug drilling matched to the standard used on the buyer's pipework
- Private label marking and packing available on OEM orders
- Mixed-diameter orders combined with other valves in one container
How It Compares With the Alternatives
| DN50 wafer butterfly valve | The wafer body requires flanges on both sides; the lug body can be used at the end of a line |
|---|---|
| Lug butterfly valve with pin-fixed disc | The pin-fixed version relies on friction for torque transfer; the spline spindle provides direct mechanical connection |
| Gate valve at DN50 | A gate valve offers a full bore but is longer, heavier, and slower to operate |
| Ball valve at DN50 | A ball valve seals tighter at higher pressure but requires more space and costs more |
Installing and Operating This Valve
- Confirm the flange standard and bolt pattern on the pipe end before ordering
- Ensure the pipe end is clean and free of burrs before installing the valve
- Tighten the through bolts evenly in a cross pattern to avoid misalignment
- Open the disc fully once bolts are tight and confirm free quarter-turn travel
- Do not use the lug body as a pipe end closure during pressure testing
- Cycle the valve periodically on lines that remain in one position for long periods
Related Models Industries and Guides
DL3B005 Worm Gear Actuator Lug Type Butterfly Valve No Pin
View Specification
DL3A001 Lug Butterfly Valve Pin Type and Gearbox
View Specification
DLC002 Lug Butterfly Valve 2pc Shaft
View Specification
DLC001 Lug Butterfly Valve Half Axle
View SpecificationWater Supply and Drainage
Sectioning valves non-return protection and joints for distribution mains pumping stations and treatment works.
Shipping and Marine
Ballast cooling and service water isolation in compact machinery spaces.
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.
DL3B001 Lug Butterfly Valve No Pin and Spline Spindle FAQ
What size and pressure rating is DL3B001?
It is a lug type butterfly valve in the DL3B series. The nominal diameter and pressure rating are confirmed on request based on your line data, as the same body is offered in multiple variants.
Can this valve be used at the end of a pipe run?
Yes. The lug body has threaded inserts on both ends, allowing it to be installed at the end of a pipe or in dead-end service.
Which materials are used for the body, disc, and seat?
Material selection depends on the medium and temperature on your line. We confirm the combination with the quotation and issue material certificates upon 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 DL3B lug butterfly valve series continues through the 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 reply with a quotation and confirmed specification sheet.
Get a Price for DL3B001 Lug Butterfly Valve No Pin and Spline Spindle
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.