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Zhejiang Dongda Pump & Valve Co., Ltd. Tel 0577-67961597 / 13806834846

Focus on flat gate valve for 26 years

We specialize in the production of flat gate valves, pneumatic shut-off gate valves,
parallel double gate valves, oilfield special valves, etc.


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Flat gate valve without diversion hole

Flat gate valve without diversion hole

产品分类:Pipeline flat gate valve
Product Categories:Pipeline flat gate valve
Sales Hotline:0577-67966500
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Product Details

product description:

The flat gate valve is suitable for oil, natural gas, water, oil and other pipelines with Class150~900/PN1.0~16.0MPa and working temperature of -29~121℃ to cut off or connect the medium in the pipeline.

Application range:

It is suitable for natural gas, petroleum, chemical, environmental protection, urban pipelines, gas pipelines and other transportation pipelines with Class150~900LB, PN1.0~16.0MPa and working temperature of -29~180℃, used to cut off or connect the medium in the pipeline, It can also be used in venting systems and steam storage devices as opening and closing equipment. The valve body has two forms: flat body and round body. The valve seat has double sealing and self-cleaning functions. It has a fully enclosed structure and good protection performance, which can adapt to all-weather requirements.

Structural features:

1. The valve body has two structures: casting and welding.

2. The valve seat adopts an O-ring seal and a floating seat structure that applies pre-tightening force to seal the inlet and outlet of the valve in both directions; and the opening and closing torque of this structure is only 1/2 of that of ordinary valves, which can easily open and close valve.

3. The valve seat adopts the sealing surface inlaid with PTFE, which has a double seal of PTFE to metal and metal to metal, and the PTFE sealing surface simultaneously removes dirt on the gate.

4. For metal-to-metal sealed valves, there is a grease injection structure on the outside of the valve body. The grease enters the valve sealing surface through the grease injector and valve seat, so that the valve achieves zero leakage.

5. The gate of the valve with diversion hole, whether it is fully open or fully closed, is always consistent with the sealing surface, and the sealing surface is protected from direct erosion by the medium, thereby prolonging the service life.

6. The valve is fully opened, the passage is smooth and straight, the flow resistance coefficient is very small, and there is no pressure loss, and the pipeline can be cleaned with a hair ball.

7. This valve adopts a packing structure with self-sealing capability, no frequent adjustment is required, opening and closing are extremely light, and the sealing is reliable, the stuffing box is equipped with an auxiliary sealing grease injection structure, the sealing performance is absolutely reliable, and truly achieve zero leakage; This eliminates the disadvantage that general valve packing is easy to leak.

8. When the valve is closed, the high pressure in the inner cavity can be automatically removed to ensure safe use.

9. Fully enclosed structure, good protection performance, can adapt to all-weather requirements.

10. The valve is equipped with an indicator rod or observation window to indicate the opening and closing of the valve.

Standard Specification:

API 6DPipeline valve
JB/T5298Steel for pipeline
ANSI B16.5aPipe flanges and flange pipe fittings
B/T79.1~79.2JIntegral cast steel pipe flange
GB/T13927General valve pressure test
JB/T9092Valve inspection and testing
JB/TQ814Steel flat gate valve product quality classification

Parts materials and working conditions:

Part NameValve body, valve covergateStemValve seatStem nutSealing ringfillerSealing finger
“Z”WCBAlloy steel (special treatment)stainless steelAlloy steel (special treatment)Aluminum bronzeFilled with PTFEFilled with PTFE and expanded graphiteOil-resistant sealing grease
“KZ”型Sulfur-resistant stainless steelAnti-sulfur sealant


If you have any questions about quotation or cooperation, please feel free to contact us by phone 0577-67966500 or use the enquiry form below. Our sales representative will contact you within 24 hours. Thank you for your interest in our products.

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