API Pressure Sealing Gate Valve
| Price: |
Negotiable |
| Trade Terms: |
CIF |
| Min Order: |
1 |
| Pay Type: |
L/C |
Product Description
Body and Bonnet Connection
The body and bonnet of Class 150~Class 900 gate valves are usually bolted bonnet design. And Class 1500~Class 2500 gate valves are usually of pressurized seal design.
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 reliablity of the packing seal.
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.
Packing Seal
Molded flexible graphite is used for packing material. PTFE or combined packing material can be also used if being requested by the customers. The internal surface of the stuffing box, of which area is contacted with the packing, is of excellent finish(Ra 3.2um). 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 0.8um)and ensure the reliable tightness of the stem area.
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 actuatuo if being requested by the customers.
Design of Disc
Gate vlaves with NPS≥ 2 are of flexible wedge gate; Gate valves with NPS <2 are of solid wedge gate.
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 API600, it is not advisable to add or change packing by the mean of back seating when the valve is pressure containing.
Seat
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. Welded 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, intergral 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 if 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, our Company's also makes cryogenic gate valve, Jacketed Gate Valve, Bellow Sealed Gate Valve, Extension Stem Gate Valve for underground application, Flat Gate Valve, etc.
China@Zhengmao Valve Co., Ltd, founded in 1992, with its registered fund of RMB50, 000, 000.00, is a professional company merges research, foundry, production, sales & service as one whole. Zhengmao is located in Oubei, Wenzhou City "China Pump and Valve Town", covering 30000 square meters. Now it owns more than 500 staffs which including 80 senior engineers.
The company's leading products including Gate Valve, Ball Valve, Butterfly Valve, Check Valve, Globe Valve, and special valves total 100s series and thousands of specifications. With 8 workshops, we can produce according to standards like ISO, API, CE, ANSI, JIS, BS, DIN, NF, GB, JB, GOST or customer's special request. Also, CAD valve design center and manufacturing test simulation of three-dimensional design system to ensure the quality of new product development and speed. Now, they are also great favored by customers in China, South-East Asia and Western countries.
Zhengmao has numerous honors: Member of China Valve Association, the oil level in the supply network members, members of the Network Power Equipment, member of China General Machinery Industry Association; It is a high-tech enterprise in Zhejiang Province, and "ZMV" is a famous trademark of Zhejiang Province.
The company constantly adheres to the conception "ALL FOR CUSTOMER" to fulfill all requirements and demands, coming up to strongest and splendid.
Eyes on the future, Zhengmao will develop and guide the market as before. We sincerely hope we can cooperate all walks of life, and get a win-win situation in world-wide.
China@Zhengmao Valve Co., Ltd, founded in 1992, with its registered fund of RMB50, 000, 000.00, is a professional company merges research, foundry, production, sales & service as one whole. Zhengmao is located in Oubei, Wenzhou City "China Pump and Valve Town", covering 30000 square meters. Now it owns more than 500 staffs which including 80 senior engineers.
The company's leading products including Gate Valve, Ball Valve, Butterfly Valve, Check Valve, Globe Valve, and special valves total 100s series and thousands of specifications. With 8 workshops, we can produce according to standards like ISO, API, CE, ANSI, JIS, BS, DIN, NF, GB, JB, GOST or customer's special request. Also, CAD valve design center and manufacturing test simulation of three-dimensional design system to ensure the quality of new product development and speed. Now, they are also great favored by customers in China, South-East Asia and Western countries.
Zhengmao has numerous honors: Member of China Valve Association, the oil level in the supply network members, members of the Network Power Equipment, member of China General Machinery Industry Association; It is a high-tech enterprise in Zhejiang Province, and "ZMV" is a famous trademark of Zhejiang Province.
The company constantly adheres to the conception "ALL FOR CUSTOMER" to fulfill all requirements and demands, coming up to strongest and splendid.
Eyes on the future, Zhengmao will develop and guide the market as before. We sincerely hope we can cooperate all walks of life, and get a win-win situation in world-wide.
More >
Other Valve Products with This Manufacturers
