The spring loaded double parallel sliding gate valve, compared to the wedge gate valve, has smaller operating torque and drive size. The internal valve plate uses an INCONEL butterfly spring instead of a coil spring, making it easier to assemble within the valve body. The special compensation structure design avoids jamming caused by high temperature conditions due to adhesion and wedge extrusion. The valve plate and seat surfaces are hardened (hard alloy overlay welding, surface spraying Co-Cr-Ni alloy, WC, boron, etc.), providing self-cleaning functions with surface hardness up to HRC90 or above.
The spring loaded double parallel sliding gate valve can be combined with pneumatic actuators, electric actuators, electro-hydraulic actuators, or manual actuators.
| Body Type |
AOC-9031 Single Parallel Sliding Gate Valves |
AOC-9032 Double Parallel Sliding Gate Valves |
AOC-9033 Spring Loaded Double Parallel Sliding Gate Valves |
| Actuator Size |
1.1/2''(40A)-36''(900A) |
1.1/2''(40A)-36''(900A) |
1.1/2''(40A)-24''(600A) |
| Plug Size |
1.1/2''(40A)-36''(900A) |
1.1/2''(40A)-36''(900A) |
1.1/2''(40A)-24''(600A) |
| Body Rating |
ANSI 150-300 |
ANSI 150-600 |
ANSI 150-1500 |
| Fluid Temperature |
-20~+250ºC |
-20~+450ºC |
-20~+566ºC |
| Connections |
Flanged(RF, RTJ), Butt Weld, Socket Weld(SW, BW) |
| Body Materials |
A216WCB/C,A217 WC6/9, A351 CF8, A351CF8M,etc |
| Trim Materials |
A105+ENP+PTFE,SUS316+Stellite, etc |
SUS316+Stellite |
| Flow Materials |
ON-OFF |
ON-OFF |
ON-OFF |
| Leakage |
Metal Seat |
ANSI Class V |
ANSI Class V, VHS |
ANSI Class V, VHS |
| Soft Seat |
Pressure seal bonnet with high-density pure graphite gasket;
Overpressure protection device introduced into the bonnet to protect against excessive pressure;
Spring preloaded flat gate valve;
Relatively wide valve seat and gate;
Limit device on the support rod;
Anti-rotation device on the valve stem;
Different hardness on both ends of the sealing surface to prevent significant wear; sealing surface has a hardness difference (~5HRC): gate - STLG#, valve seat - STL12#;
Sealing on the bonnet with a conical design;
Bidirectional flow;
Two thrust bearings and aluminum bronze sleeves;
Available structure for bypass piping;
Spring Compensated Valve Plate Assembly
Graphite ring pressure self-sealing structure
The higher the pressure, the higher the sealing force.
In high-temperature or frequently changing temperature conditions, we recommend using graphite pressure sealing gaskets to replace standard soft iron gaskets for high-temperature and frequent temperature cycle applications.
Double Parallel Sliding Gate Valves
The Double Parallel Sliding Gate Valves uses a sealing structure consisting of two parallel gates and their wedging device, replacing the traditional wedge gate valve structure. The sealing mechanism components are separate, ensuring sealing even under temperature-induced deformation without jamming due to high temperature expansion.
When the valve opens, the sealing disk and valve seat first disengage and then rise due to the wedge block effect, greatly reducing friction between sealing surfaces. Thus, the torque is small, operation is easy, and the service life is long. This design addresses issues like large lifting force required for single gate start, easy sealing surface wear, poor sealing, short service life, and high-temperature opening and closing jamming, thereby improving the valve's sealing performance and service life.
SNT Machinery(Qingdao) Co. , Ltd is a producer of control valves, combines manufacturing, designing, sales and services in one. It has high starting point quick development SNT is located in Qingdao, Shandong province with an area for 42000m2, equipped with modern workshop and production equipment. It is a high-tech enterprise with independent intellectual property rights and imported advanced management and production experience. Now it has more than 150 workers, and R&D specialist accounts for 15%, graduates or with higher degrees account for 30%. Depending on high quality production management team and innovative technology research and development, now we produce large quantities of high quality vales used in petrochemical, oil and coal chemical industries. We have a sales value to nearly 100billion in the year 2017.
Now SNT has got the TS special equipment manufactuuring certificate and ISO 9001, and has acquired the net qualification certificate of SINOPEC,CNOOC, PETROCHINA and SINOCHEM. And we have got the National Patent in many technologies. We can design and manufacture all series of valves according to ANSI, API, DIN, BS, JIS standards. Combining the advantages of famous valves all cross the world and with independent research and development, until now we can manufacture all kinds of valves, including GLOBE, High Pressure Boiler Blow-down Valves, High-performance Butterfly Valves, Angle-regulating Valves, Eccentric Rotary Valves, T Three-eccentric Center Butterfly
Valves, V Ball Valves, High Wear-resistant Ball Valves, High Pressure Steam Valves, Micro-flow Control Valves, Self-operated Control Valves, Cryogennic Valves tc, Driving form includes manual operation, power-drinven, pneumantic and hydraulic drive. Materials for main parts are A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M etc. Specification 1/2"~120", working pressure ANSI 150#~2500#, working temperature -196ºC~1100ºC.
Relying on advanced production technology management and qulity assurance system, SNT Valves have been widely used in petrochemical, oil, steel&iron, paper manufacturing and power station industries. Our customers include SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Qingdao Refinery, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINC Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Changling branch, Jinan branch etc.
We make user's profits as our priority, devoting ourselves to the establishment of excellent quality and good brand, Our perfect quality assurance and after-sales systems guarantee that SNT valves join hands with all our customers and creat prosperity.
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