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HYDRAULIC VALVES

NEEDLE VALVES / CHECK VALVES /FLOW CONTROL VALVES /THROTTLE VALVES /BALL VALVES - AS PER DIN /SAE/BSP / NPT

NEEDLE VALVES

Needle valves are small valves used for flow control in liquid or gas services. The fine threading of the stem and the large seat area allow for precise resistance to flow.

Needle valves have a slende, tapered point at the end of the vlave stem that is lowered through the seat to restrict or block flow. Fluid flowing through the valve turns 90° and passes through an orifice that is the seat for a rod with a cone shaped tip. These small valves are widely used to accurately regulate the flow of liquids and gases at low flow rates. The fine threading of the stem and the large seat area allow for precise resistance to flow. Needle valves are used to control flow into delicate guages, which might be damaged by sudden surges of fluid under pressure. Needle valves are also used in situations where the flow must be gradually brought to a halt, and at other points where precise adjustments of flow are necessary or where a small flow rate is desired. They can be used as both on/off valves and for throttling services.

   
   
   

BALL VALVES

Ball valves are quarter - turn, straight through flow valves that have a round closure element with matching rounded seats that permit uniform sealing stress. Ball valves are used in situations where tight shut - off is required. The type of seat can vary with the valve pressure rating and material of construction. Some valve seats are composed of single molded forms, while other seats with higher - pressure rating often incorporate a trunnion design where each face of the ball is separately sealed. They are wide duty valves, able to transfer gases, liquids and liquids with suspended solids (slurries).

In general, ball valves offer many advantages when contrasted with other valve types. They provided superior ease of operation and can maintain and regulate high volume, high pressure and high temperature flow. Most ball value offer rugged construction providing for a long service life, and a comparably low cost. Additionally, the design of the regulating element allows the valve to function without the complication of side loads, typical of butterfly or glode valves and the valve design permits inspection and repair of seats and seals without removing the valves body from the line.

Ball vlaves are available in a variety of body styles, including one - piece, two - piece, three - piece and flanged body construction. Each of these ball valve forms offers specific advantages depending upon the given application. Similarly, they are designed using a wide variety of materials, as required by their application. Common ball valve materials include brass, bronze, copper, castiron, ductile iron, stainless and other steel types, metal alloys and plastics including PVC and CPVC. It is best on consult with the manufacturer for the specific properties of the materials used in the valve, and how this relates to the application that include type, concentration and temperaturer of the media being handled

   
   
   
FLOW CONTROL VALVES
  • NPT & SAE Connections
  • Carbon Steel With Black Oxide Plating
  • Set Screw Allows Knob to be Locked into Position
  • Graduated Knob & Spindle for Accurate Flow Control
  • 7 PSI Standard Spring Setting
  • Buna O-Ring / PTFE Stem Packing
  • Temperature Range -4°F to +176°F
   
   
   
THROTTLE VALVES
  • NPT & SAE Connections
  • Carbon Steel With Black Oxide Plating
  • Set Screw Allows Knob to be Locked into Position
  • Graduated Knob & Spindle for Accurate Flow Control
  • Buna O-Ring / PTFE Stem Packing
  • Temperature Range -4° F to + 176°F
   
   
   
CHECK VALVES

Check valves are self - activating safety valves that permit gases and liquids to flow in only one direction,preventing process flow from reversing. They are classified as one - way directional valves. Fluid flow in the desired direction opens the valve, while backflow forces the valve closed. The mechanics of check valve operation are relatively simple. Most check valves contain a ball that sits freely above the seat, which has only one through hole. The ball has a slightly larger diameter than of the through hole. When the pressure behind the seat exceeds that above the ball,liquid is allowed to flow through the valve however, once the pressure above the ball exceeds the pressure below the seat, the ball returns to rest in the seat, forming a seal that prevents backflow.

Check valves use a variety of technologies to allows and stop the flow of liquids and gases.Single - disc swing valves are designed with the closure element attached to the top of the cap. Double - disc or wafer check - valves consist of two half - circle disks hinged together that fold together upon positive flow and retract to a full - circle to close against reverse flow. Lift check valves feature a guided disc. Spring - loaded devices can be mounted vertically or horizontally. Silent or center guide valves are similar to lift check valves,with a center guide extending from inlet to outlet ports. The valve stopper is spring and bushing actuatedto keep the movement "quite". Ball check valves use a free floating or spring loaded ball resting in a seat ring as the closure element. Cone check valves use a free floating or spring loaded cone resting in the seat ring as the closure element.

   
   
   
QRC - COUPLINGS QUICK RELEASE COUPLINGS

QRC

TECHNICAL INFORMATION:-

This type of couplings simply work on push & pull principle, the adaptor when pushed to the coupler is accurately held by the self locking arrangement resulting in a positive & leaf proof connection. This action simulteneously opens the valve & fluid flow starts.

To disconnect, pull back the sleeve of the coupler, the adaptor ejecta out and the valves shuts off automatically, valves are provided in type one way sealing & two way sealing.

Quick connect / release couplings eliminate valves and screw on fittings in many pnumatic, hydraulic and chemical systems.

They permit easy, safe, qiuck & reliable connections between delivery lines, pressure hoses etc and a wide range of equipment with couplings; connectionor disconnection of fluid systems is as easy as plugging in an electric gadget.

MATERIALS OF CONTRUCTION - AS PER STANDARDS

a) BODY :- Available in brass / C.S.- chrome plated (from bar stock only) also available in S.S. - 304 & S.S. -316 (from bar stock only)

B) Spring :- Available in spring steel S.S.-304 / S.S.316 as required

C) Ball :- Available in steel, S.S.-304 & S.S.-316

D) Seal Materials :- Available in nitrile, viton, neoprene, silicon materials.

SIZES :-
Sizes are mainly from 1/8" up to 2" used by various industries & having end connections like pipe thread Male/Female, hose shank etc.

There are three types of quick couplings mainly used as follows:-

  1. Through bore qrc - MAKE - "T"
  2. Single check valve qrc (One way shut off type) - MAKE - "V"
  3. Double check valve qrc (Two way type) - MAKE - "W"

TECHNICAL DESCRIPTION FOR QUICK COUPLINGS

1) QUICK RELEASE COUPLING - THROUGH BORE TYPE

Thru couplings have no check valves in either half and are ideal for maximum flow application. Their smooth, open bore offers the lowest pressure drop of any quick disconnected couplings and allows them to be throughly cleaned. Since there is no valves in either half, fluid flow should be shut off before the coupling is disconnected

APPLICATION:- Used where quickly detachable and rotatable conections are needed where regulation and closure of line is achieved by back up valves.

   
   
   

CAMLOCK COUPLING

A camlock is in fact, a means of quick engaging of disengaging a hose connection from a system requiring transfer of fluid or gas. It consists of a COUPLER with cam arms and a slip in ADAPTOR. In order to connect the Arm of the coupler need to be lifted and the adaptor slipped into the coupler. The handle are then pressed down with normal hand pressure for a leak proof connection

B. TYPE:-
The coupler & Adaptors are available in different configurations:-
i) With male and female threads (BSP, BSPT, or NPT)
ii) With hose shanks
iii) With flanges or weld ends.
N.B. Dust plugs & caps are also available against specific order.

C. TECHNICAL DATA

1. BODY MATERIALS : a. BAR STOCKS b.CASTING
    Mild Stocks / Brass / S.S. 304 / S.S. 316
    Carbon Steel / Gun Metal / S.S. 304 / S.S. 316
     
2. SEALING : Nitrile / Viton / Neoprene / Silicion / teflon / Hypalon
     
3. SIZES : From 3/4" to 4"
    Higher sizes on special orders
    Typers with identification part numbers

   
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Single ferrule type | Twin ferrule type | Flare Fittings type | Thread fittings type | Weld Nipple Fittings type | Light series clamps | Heavy series clamps | Twin series clamps | Rubber hoses | Teflon hoses | S.S. flexible hoses | Needle Valves | Ball Valves | Flow Control Valves | Throttle Valves | Check Valves | Quick release couplings | Camlock couplings | Socket weld type | Split type | Butt weld type | Dowety Seals | Copper Washer | Seamless Tubes | 2 way valve manifolds | 3 way valve manifolds | 5 way valve manifolds | Diagnostic Test Coupling
 
 
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