Notice:The original Zhejiang Chaoda valve Co., Ltd upgraded itself to Chaoda Valves Group Co., Ltd, that is the Chaoda Valves Group, and as Chaoda Group for short.


API Gate Valve

API Gate Valves

   API Gate Valve developed by Chaoda has following good characteristics: good sealing performance, reliable safety guarantee, long life span and etc. Pressure retaining component is all produced with precision casting, and malleable iron is used for the handwheel to match the stem so as to have a easy operation of valve. There is a clear sign of "Open" & "Closed" on valve's handwheel. 

   API Casting Gate valve is widely used on pipeline in industries such as steel, metallurgy, chemical where needing oxygen for its advantages of reliable sealing, high hardness, wear-resistance, high temperature resistance, corrosion resistance, long life span and etc. According to different types of disc, it could be divided into Wedge gate valve & Parallel gate valve. Wedge gate valve could be:  single disc solid wedge gate valve, double disc wedge gate valve and flexible wedge gate valve; Parallel gate valve could be single disc or double disc type. However, if we classify the valve by the different positions of stem thread, then it could be rising stem and non-rising stem type gate valve. Manual/bevel gear/pneumatic or electric actuators could be chosen by needs

API Gate Valve

Type: Z41H,Z41Y,Z61H,Z61Y,ZA40W
Bore: NPS½~NPS66,DN15~DN1650
Rating: Class150~Class900,PN10~PN160
Material: Carbon Steel,Stainless Steel,Alloy Steel,Duplex Stainless Steel
Operation: Manual,Gear Operated,Electric Operated,Pneumatic Operated
Applicable: Oil,Chemical,Natural Gas,Petrochemical,Coal Chemical and so on


API Gate Valve product description

    API Gate valves(Generally flanged connection, but Butt-welding optional) are suitable for use on various kinds of pipeline from Class150 To Class900, PN10 To PN160 to cut off or connect the flowing of medium. By using different material, the API Gate Valve could be suitable for medium such as water, steam, oil, nitric acid, acetic acid, oxidizing substance, carbamide and etc. Manual/bevel gear/pneumatic or electric actuators could be chosen by needs. 

    CHAODA GROUP WENZHOU E-BUSINESS CO., wholly owned subsidiary by Chaoda Group,Professional sales CHAODA group products,CHAODA valve products。CHAODA valves won the reputations of Zhejiang Famous Trademark,Zhejiang Famous Brand,Zhejiang Famous Exporting Brand and also enjoys prizes of 101 National Patent。

API Gate Valve product features

Design of Disc:Gate Valves with NPS≥2 are of flexible wedge gate; Gate valves with NPS < 2 are of solid wedge gate.

Body and Bonnet Connection:The body and bonnet of Class 150~Class 900 gate valves are usually bolted bonnet desing. And Class 1500~Class 2500 gate valves are usually of pressurized seal design.

Gasket of Cover Flange:Carbon steel or stainless steel + flexible graphite combined gasket is used for Class 150 gate valve; Stainless steel + flexible graphite wounded gasket is used for Class 300 gate valve; Stainless steel + flexible graphite wounded gasket is used for Class 600 gate valve, and ring joint gasket is also optional for Class 600 gate valve; Ring Joint gasket is used for Class 900 gate valve; Pressurized seal design is used for Class 1500~Class 2500 gate valve.

Actuation:Hand wheel or gear box is usually used for gate valve actuation. Chain wheel and electric actuator can be also used for gate valve actuation if being requested by the customers.

Packing Seal:Molded flexible graphite is used for packing material. PTFE or combined packing material can be also used if being requested by the customer. The internal surface of the stuffing box, of which area is contacted with the packing, is of excellent finish (Ra 3.2 |m). The stem surface, contacting with the packing, should be rolled and pressed after being precisely machined, so as to reach to the high finish and compactness (Ra 0.8 |m ) and ensure the reliable tightness of the stem area.

Belleville Spring Loaded Packing Impacting System:If being requested by the customer, the Belleville spring loaded packing impacting system can be adopted for enhancing the durability and reliability of the packing seal.

Back Seating Design

All our gate valves have the back seating design. In most cases, the carbon steel gate valve is fitted with a renewable back seat. For stainless steel gate valve, the back seat is machined directly in the bonnet or is machined after welding. When the gate valve is at fully open position, the sealing of the back seat can be very reliable. However, as per the requirement of API 600, it is not advisable to add or change packing by the mean of back seating when the valve is pressure containing.


For carbon steel gate valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by the customer. Renewable threaded seat is used for NPS≤10 gate valves, and welded on seat can be also optional if being requested by the customer. Welded on seat is used for NPS≤10 carbon steel gate valves. For Stainless steel gate valve, integral seat is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel gate valve if being requested by the customer.

Stem Design

The stem is of integral forged design. The minimum diameter of the stem shall per the standard requirement. The connection of the stem and disc is T type. The strength of the connecting area is bigger than that of the T threaded part of the stem. The strength test of that area conforms to API 591.

Stem Nut

Usually, the stem nut is made of ASTM A439 D2. it is also can be made of copper ally if being requested by the customer. For large sized gate valves ( NPS 10 for Class 150, NPS 8 for Class 300, NPS 6 for Class 600, NPS 5 for Class 900), rolling bearing is fitted at the two sides of the stem nut in order to minimize the open and close torque of the gate valve.

 Special Gate Valve

Besides the common gate valves, Chaoda Company also makes cryogenic gate valve, Jacketed Gate Valve, Bellow Sealed Gate Valve, Extension Stem Gate Valve for underground application, Flat Gate Valve, etc.

API Gate Valve standards

 Design and manufacture standards:API 600, ISO 10434, API 6D
 Face to face dimensions standards:ASME B 16.10
 Flange dimensions standards:ASME B 16.5,ASME B 16.47, MSS SP-44
 Testing inspection standards:API 598, API 600, ISO 10434, API 6D

API Gate Valve parts and material

API Gate Valve main size and weight

CHAODA valves group co.,ltd. Professional manufacturing API Gate Valve.


How to Order:   

1.Clients could call telephone +86-0577-67319962 or email us your enquiry including following information.

①Valve’s type, End to End dimension ②Connection Ends ③Nominal diameter ④Service medium and temperature and working pressure range
⑤Material, test standard and other requirement ⑥CHAODA could supply all kinds of actuator and spare parts and so on as client’s requirement.

2.When received clients’ enquiry, we would select the suitable valves for your and give you a offer.

3.And have a communication over the API Gate Valve delivery or other special requirement.

4.When have special requirement on your API Gate Valve products, please specify it in the purchasing order.

5.Should you have any question, please send email to