Pneu-Hydro Products

Pneu-Hydro Products has long been a leading manufacturer of pneumatic and hydraulic valves and systems for the aircraft and missile industry. More recently, Pneu-Hydro has also pioneered in the design and fabrication of a rapidly growing line of industrial valves for hydraulic, pneumatic, and specialized fuel applications, especially as applied to automated production equipment and precision machinery of all types.
Typical commercial products include control valves, regulators, check valves, relief valves, filters, and actuators.
With completely integrated development, engineering, testing, and manufacturing facilities, Pneu-Hydro can meet your most exacting specifications. In many cases existing designs can be applied quickly to your requirements with a speed that rivals off-the-shelf delivery. All our facilities and experience are at your disposal. Feel free to call on us to discuss your problem.

Inline Relief Valves

Pneu-Hydro bar stock relief valves remain bubble-tight up to cracking pressure. They reseal at less than 10% drop from cracking pressure in lower ranges, and less than 5% at higher ranges.
Cracking pressure is reliable, repeatable and easily set by an internal adjustment, which is tamper-proof once the valve is installed in the system. An O-ring seals the poppet while a metallic stop bears the spring load. This simple design provides crisp settings and long life. The standard valve is constructed of 316 stainless steel for strength and durability in the most corrosive applications.

Specifications

Operating pressure ranges
401 series	50 to 3,000 psid
402 series	4,000 to 10,000 psid
Operating temperature ranges
Buna-N seals	-40° to 250°F (-40° to 121°C)
Viton seals	-20° to 450°F (-29° to 232°C)

Ordering Information

Model Number Pipe Size Length Hex Cv Pressure Range Dash # 401F4Q-1,2 1/4 NPT Female 3 15/16 .6 50 – 250 psid -1 401F6Q-1,2 3/8 NPT Female 4-1/4 1-3/8 1.3 250 – 600 psid -2 401F8Q-1,2 1/2 NPT Female 4-39/64 1-3/8 1.3 500 – 1,750 psid -3 401M4Q-1,2 1/4 NPT Male 3-1/2 15/16 .6 1,500 – 3,000 psid -4 402F4Q-2 1/4 NPT Female 4-1/2 1-3/8 .6 4,000 – 10,000 psid N/A 402F8Q-2 1/2 NPT Female 4-43/64 1-3/8 .6 4,000 – 10,000 psid N/A

1Dash number for desired pressure range must be inserted. 2Buna-N is standard elastomer and requires no code. For Viton, insert “V”. Consult factory for other materials. For example, Model No. 401F4Q-2V specifies an inline relief valve with 1/4 NPT female ports, Viton O-rings, and a 250 – 600 psid range.

 

Miniature Relief Valves

Pneu-Hydro miniature relief valves provide zero leakage up to cracking pressure. They reseal bubble-tight within 5% to 10% of cracking pressure. Adjustments are insensitive to temperature variations.

These miniature relief valves are made from 316 stainless steel for strength and corrosion resistance. Material options can be provided on request. Buna-N or Viton O-rings are standard but other O-ring materials can be provided. Back-pressure on the 405 and 407 series (with connected vent line) should be limited to 1,000 psid.

Specifications

Operating pressure ranges
404 and 405 series	50 to 5,000 psid
406 and 407 series	5,000 to 13,000 psid
Cv	.035
Operating temperature ranges
Buna-N seals	-40° to 250°F (-40° to 121°C)
Viton seals	-20° to 450°F (-29° to 232°C)

Ordering Information

Pressure Range Vent to Atmosphere 1/4 NPT Vent Connection Buna-N Viton Buna-N Viton 50 – 100 psid 404M4Q-10 404M4Q-10V 405M4Q-10 405M4Q-10V 100 – 150 psid 404M4Q-1 404M4Q-1V 405M4Q-1 405M4Q-1V 150 – 250 psid 404M4Q-2 404M4Q-2V 405M4Q-2 405M4Q-2V 250 – 350 psid 404M4Q-3 404M4Q-3V 405M4Q-3 405M4Q-3V 350 – 600 psid 404M4Q-4 404M4Q-4V 405M4Q-4 405M4Q-4V 600 – 900 psid 404M4Q-5 404M4Q-5V 405M4Q-5 405M4Q-5V 900 – 1,500 psid 404M4Q-6 404M4Q-6V 405M4Q-6 405M4Q-6V 1,500 – 3,000 psid 404M4Q-7 404M4Q-7V 405M4Q-7 405M4Q-7V 3,000 – 5,000 psid 404M4Q-8 404M4Q-8V 405M4Q-8 405M4Q-8V 5,000 – 13,000 psid 406M4Q 406M4Q-V 407M4Q 407M4Q-V

Notes: Material and connection options are also available. Consult factory. Optional materials include brass and aluminum. Optional connections include MS-33656-4.

 

Right Angle Relief Valves

Pneu-Hydro right angle relief valves are pressure balanced internally and pressure referenced to atmosphere. This yields insensitivity to downstream pressure and permits the valve to be used as a back-pressure regulator. The valve seals against a soft seat and has a metal stop that bears the spring load, prolongs seal life, and prevents sticking.
These valves remain bubble-tight up to cracking pressure and reseal bubble-tight at less than 10% drop from cracking pressure (significantly less in the higher pressure ranges). The external setting adjustment is particularly useful in applications where changes are required. The design provides full flow at a very small rise above cracking pressure.

Features include a wide series of available pressure ranges, smooth, chatter-free performance, reliable and repeatable cracking and reseating pressures, along with 316 stainless steel construction. Seal material selections are available for compatibility with virtually any fluid chemistry. Standard seal materials are Buna-N and Viton.

Specifications

Operating pressure ranges
Proof pressure	20,000 psig
Burst pressure	40,000 psig minimum
Operating temperature ranges
Buna-N seals	-40° to 250°F (-40° to 121°C)
Viton seals	-20° to 450°F (-29° to 232°C)

Ordering Information

Pressure Range	Male Inlet and Female Outlet		Male Inlet and Outlet		Cv
	Buna-N	Viton	Buna-N	Viton
100 – 150 psid	408M4F4Q-1	408M4F4Q-1V	408M4Q-1	408M4Q-1V	.25
150 – 250 psid	408M4F4Q-2	408M4F4Q-2V	4048M4Q-2	408M4Q-2V
250 – 350 psid	408M4F4Q-3	408M4F4Q-3V	408M4Q-3	408M4Q-3V
350 – 600 psid	408M4F4Q-4	408M4F4Q-4V	408M4Q-4	408M4Q-4V
600 – 900 psid	408M4F4Q-5	408M4F4Q-5V	408M4Q-5	408M4Q-5V
900 – 1,500 psid	408M4F4Q-6	408M4F4Q-6V	408M4Q-6	408M4Q-6V
1,500 – 3,000 psid	408M4F4Q-7	408M4F4Q-7V	408M4Q-7	408M4Q-7V
3,000 – 5,000 psid	408M4F4Q-8	408M4F4Q-8V	408M4Q-8	408M4Q-8V
5,000 – 10,000 psid	409M4F4Q	409M4F4Q-V	409M4Q	409M4Q-V	.09

 

Check Valves

Pneu-Hydro’s bar stock check valves seal bubble-tight, even without back-pressure. When open, they provide a smooth flow-path with minimum resistance. The poppet is spring-loaded for positive operation regardless of orientation. Back pressure and spring loads are borne by a metal stop rather than the soft O-ring seal. This ensures long seal life and minimum maintenance. Operation is smooth and chatter-free.

These check valves are constructed of 316 stainless steel for strength and corrosion resistance and meet the requirements of NACE MRO175. Because of their bar stock design, the valves can be easily made from a variety of materials to satisfy the needs of your operating environment. Buna-N or Viton seals are available from stock, and other O-ring materials can be provided.

Specifications

Operating pressure ranges
Maximum	10,000 psid
Operating temperature ranges
Buna-N seals	-40° to 250°F (-40° to 121°C)
Viton seals	-20° to 450°F (-29° to 232°C)

Ordering Information

Inlet Outlet Dimensions Cv Model Number L Hex 1/4 NPT F 1/4 NPT F 2-9/32 3/4 .55 301F4Q 1/4 NPT M 1/4 NPT M 2-11/32 3/4 .55 301M4Q 1/4 NPT M 1/4 NPT F 2-9/32 3/4 .55 301M4F4Q 3/8 NPT F 3/8 NPT F 3-1/8 1-1/16 1.3 301F6Q 1/2 NPT M 1/2 NPT M 3-5/8 1-1/16 1.3 301M8Q

Notes:

Buna-N seals are standard. For optional Viton seals add “- V” to the model number. Contact factory for other seal material options. 316 stainless steel is standard construction material. Valves made in other materials will have varying pressure ratings due to material chosen. Contact factory for information. All models are designed for 5 psid cracking pressure. To order valves with the optional pressures shown below, add the indicated suffix number to the basic model number.

Crack Pressure Suffix Number Example Part Numbers: 2 psid -1 301F4Q Standard, Buna-N O-ring, 5 psid cracking pressure 10 psid -2 301F4Q-V Viton O-ring, 5 psid cracking pressure 25 psid -3 301F4Q-3 Buna-N O-ring, 25 psid cracking pressure     301F4Q-3V Viton O-ring, 25 psid cracking pressure

 

Hydraulic Quick-Vent Valves

Pneu-Hydro hydraulic quick-vent valves are designed to be placed in the line between a control valve and actuator. When control pressure is applied, the internal poppet closes the quick-vent port and directs flow through the outlet to the actuator. Upon release of pressure, the poppet’s internal check closes and the poppet is lifted off the vent seat. The large capacity of the outlet/vent passage permits rapid flow from the actuator.
The valve is constructed of corrosion resistant materials in accordance with NACE MR-01-75.

Specifications

Operating pressure ranges
Maximum	10,000 psid
Operating temperature ranges
Buna-N seals	-40° to 250°F (-40° to 121°C)
Viton seals	-20° to 450°F (-29° to 232°C)

Ordering Information

Part No.	Deion
433254	Buna-N seals
433254-V	Viton seals

 

Hand Valves

Pneu-Hydro hand valves offer design and operating features not typically found on valves of this pressure range. The Teflon stem packing is located below the stem threads and pintle swivel. This helps prevent contamination and lubrication washout by isolating this critical area from the process fluid. This, combined with the very low operating torque (less than 10 lb-inches), provides a precise “feel” and adjustment sensitivity over the lifetime of the valve.

The valve stem is designed so that it cannot be inadvertently backed out of the valve. The low profile makes this valve ideally suited for panel mounted or other limited space applications.
Standard features include self-aligning swivel pintles to minimize seat scoring, Teflon stem seal, and 316 stainless steel construction to provide maximum compatibility with corrosive fluids.

Specifications

Operating pressure ranges
Maximum operating pressure	10,000 psig (except 206F4Q)
Proof pressure	20,000 psig
Burst pressure	40,000 psig
Operating temperature ranges
Temperature range	-65° to 450°F (-53° to 232°C)
Cv	.26

Ordering Information

Inlet Outlet Dimensions Orifice Cv Model Number L H Sq 1/4 NPT F 1/4 NPT F 1-13/16 2/1/2 1 .125 .26 202F4Q 1/4 NPT M 1/4 NPT F 1-15/16 2/1/2 1 .125 .26 202M4F4Q 1/4 NPT F 1/4 NPT F 1-13/16 2-3/8 7/8 .125 .26 206F4Q* 1/2 NPT F 1/2 NPT F 3 3-3/4 1-1/2 .250 .80 202F8Q

*6,000 psig maximum operating pressure

 

Shuttle Valves

The heart of a Pneu-Hydro shuttle valve is a stainless steel ball. The slightest pressure blows this ball from one O-ring seat to the other and directs flow to the outlet port. The breakaway friction of sliding seal designs is eliminated by this “contact seal” principle.
Pneu-Hydro shuttle valves are made from 316 stainless steel. Buna-N seals are standard, but Viton or other elastomers are available to meet specific requirements.

Specifications

Operating pressure ranges
Operating pressure	250 psig (maximum)
Proof pressure	375 psig
Burst pressure	5,000 psig
Operating temperature ranges
Buna-N seals	-40° to 250°F (-40° to 121°C)
Viton seals	-20° to 450°F (-29° to 232°C)
Cv	.40

Ordering Information

Part No.	Deion
801F4Q	Buna-N seals
801F4Q-V	Viton seals

 

Pneumatic Control Valves

Pneu-Hydro’s pneumatic control valves are simple and robust. These smooth acting valves offer bubble-tight sealing. They can be line, panel, or bracket mounted to comply with your toughest installation problems.
Constructed of 316 stainless steel, with a broad selection of available O-ring materials, they can be used in your toughest applications.

Specifications

Operating pressure ranges
Operating pressure	250 psig maximum
Proof pressure	375 psig
Burst pressure	5,000 psig
Operating temperature ranges
Viton seals	-20° to 450°F (-29° to 232°C)
Cv	.40

Ordering Information

Part No.	Deion
183552	Panel mounted, pushbutton
183554	Bracket mounted, pushbutton
183612	Line mounted, pushbutton
433553	Bracket mounted, pilot operated
433555	Line mounted, pilot operated

 

Hydraulic-Pneumatic Interface Valves

Occupying about a third of the space required by conventional diaphragm interface valves, this three-way, two position, normally closed valve permits a low-pressure signal from an integral pneumatic pilot to control a high-pressure hydraulic power system. The pilot section handles pressures to 1,000 psi; the hydraulic section accommodates pressures to 10,000 psi.
In this unique spool valve design, the usual pilot diaphragm is replaced by a piston. The use of a stainless steel piston and compatible seal eliminates failures due to diaphragm leakage and incompatibility of diaphragm with process fluids.
A high ratio of hydraulic power pressure to pilot control pressure insures safe operation and positive control under all conditions. A pilot pressure of 50 psi controls 5,000 psi hydraulic power; 80 psi pilot pressure controls 10,000 psi hydraulic power pressure.
A soft seal design insures zero leakage in the hydraulic power section. Metal-to-metal seating insures against leakage in emergency situations.
Failsafe closure is insured, as both the internal spring and hydraulic pressure acting on the differential spool area provide sufficient force to effect closure, should one or the other fail. Normally both act to close the valve.

A positive indicator of operation is provided in the spool extension, which shifts to show position.
Excellent flow capacity is provided with a value of Cv=0.5 or the equivalent of an orifice of .224 inch diameter.
A normally open version of this valve is also available under product number 433242-P.
With minor differences the dimensions and operating parameters are the same for this version.
The manual override version has a turning handle located at top center of piston housing.

Specifications

Complete assembly
Weight	5.8 lbs. (2.6 Kg)
Pilot section
Fluid	Air or hydraulic
Operating pressure	50 psi (3.45 bar) air pressure for 5,000 psi (345 bar) hydraulic pressure 80 psi (5.5 bar) air pressure for 10,000 psi (689 bar) hydraulic pressure
Working pressure	1,000 psi (68.9 bar) maximum
Proof pressure	1,500 psi (103.4 bar)
Burst pressure	2,000 psi (137.9 bar)
Valve section
Fluid	Hydraulic fluid or diesel
Working pressure	10,000 psi (689 bar) maximum
Proof pressure	15,000 psi (1034 bar)
Burst pressure	20,000 psi (1379 bar)
Temperature range	-65° to 450°F (-53° to 232°C)
Flow capacity	Cv +0.5
Flow	39 GPM at 5,000 psi (147 liters per minute at 345 bar)
Internal leakage	Zero
External leakage	Zero

Ordering Information

Part No.	Deion
183834-P	6,000 psi working pressure, manual override, Viton seals
433174-P	6,000 psi working pressure, standard and H2S-CO2 service, Viton seals
433174-PA	6,000 psi working pressure, Arctic service, -65°F Buna-N seals
433174-PH	8,000 psi working pressure, standard and H2S-CO2 hydraulic pilot, Viton seals
433174-PHA	8,000 psi working pressure, Arctic hydraulic pilot, -65°F Buna-N seals
433242-P	6,000 psi working pressure, normally open, Viton seals
433707-P	6,000 psi working pressure, two inlet, Viton seals
434189	10,000 psi working pressure, standard and H2S-CO2 service, Viton seals

 

Excess-Flow Check Valves

The Pneu-Hydro excess-flow check valve has been designed to contain pressurized fluids in the event of catastrophic down-stream failure. Its poppet is normally held open by a spring and flow is permitted in both directions through the valve. In the event of down-stream failure (line-rupture, seal-failure, gauge over-pressurization and failure, etc.) the resultant pressure-drop across the poppet orifice creates an imbalance which closes the poppet. The poppet remains closed, preventing further escape of fluid, until the system is repaired. Removal of supply pressure for system maintenance allows the spring to reset the poppet to its open position.

Specifications

Operating pressure ranges
Service	Standard, H2S-CO2
Design specification	NACE MR-01-75
Fluid	Liquid or gas
Operating pressure	50 psi (3.45 bar)
Working pressure	7,500 psi (517 bar) maximum
Proof pressure	10,000 psi (689 bar)
Burst pressure	15,000 psi (1034 bar)
Operating temperature ranges
Viton temperature range	-20° to 450°F (-29° to 232°C)
Flow capacity	Cv .45
Flow	Valve shuts pneumatically at 1.0 psid Sensitivity can be adjusted by sizing orifice (2) or springs (consult factory)
Internal-external leakage	Zero
Weight	.375 lbs.

Ordering Information

Part No.	Deion
213677	Viton seals

 

Sand Probe Valves

Continuous monitoring of the effects of an abrasive product on flowline and valves is possible with the use of the Pneu-Hydro Products sand probe.
A sensing probe of a predetermined thickness extends through the pipe wall into the flow path of the abrasive product. When the probe is cut, indicating a known degree of erosion to lines, valves, and fittings, pressure from the flowline enters the sand probe valve body, shifting the spool valve and vents off a control pressure. This signal may be used to either close a valve or trigger an alarm.
The device is suitable for use with pneumatic control systems. Select the probe length and thickness from the probe kit chart on this page.
The sensing pilot is designed with a 1/2 NPT male thread for attachment to the pipe. This surrounds a 1/4 NPT female connection. With this configuration, probes can be readily fabricated in the field from standard fittings and tubing.

Features and Advantages

• Wide pressure range: This device may be safely operated in flowlines containing pressures in the range of 25 psi to 10,000 psi.
• Control pressure range: The pilot handles a control system pressure of 20 psi to 250 psi.
• Visual indicator: When the probe has been cut and the pilot spool shifts, the palm button and red band on the main spool indicate that the pilot has been activated.
• Manual control: The palm button on the pilot may be used at any time to cycle the valve and test the system.
• Simplicity: When the probe has been cut by abrasive action of the flowing product, the pressure in the pipeline shifts the pilot spool.
• Choice of probes: Standard wall probes are available in thicknesses of .028; .035; .049; and .065 inches. Standard length probes are 6, 10, and 14 inches.

Selection Procedures

The sand probe gives an accurate indication of the erosion on the flowline and its components. In the following procedure, the use of probes of different wall thicknesses is demonstrated:

• Pipe: 2-inch schedule 80 - normal wall thickness .218-inch.
• Minimum wall thickness for 1200 psi operation: .15 inch.
• Maximum allowable erosion: .068 inch (.218 minus .15).

Specifications

Operating pressure ranges
Sensing pressure	10,000 psi (689 bar) maximum
Control pressure	250 psi (17 bar) maximum
Operating temperature ranges
Temperature range	-20°F to 450°F (-29°C to 232°C)
Product weight	1.5 lbs. (.68 kg.)

Ordering Information

Basic valve body and repair kit.

Part No. Deion 434051 30 to 250 psi working pressure, valve assembly (less probe) 434052 250 to 10,000 psi working pressure, valve assembly (less probe) 434062 250 to 10,000 psi working pressure, panel mount valve assembly (less probe) 614051 Repair kit for valve assembly 434051 (does not contain probe) 614052 Repair kit for valve assembly 434052 (does not contain probe)

For example, one Pneu-Hydro Products sand probe assembly for standard and H2S-CO2 service, part no. 434052. Parts request (for valve only), one repair kit for a Pneu-Hydro Products sand probe assembly for standard and H2S-CO2 service, part no. 614052.

 

Pressure Indicators Pneu-Hydro’s pressure indicator offers easy to read evidence of the presence or absence of pneumatic pressure in a control circuit. When pressure rises to approximately 14 psi, a solid green band shows through the window. If the pressure drops below 8 psi, a red and white striped band appears. The colors are reflective for visibility in lighted surroundings. The striped section provides added recognition of system status under dimly lit conditions or for color-blind personnel. The unit mounts through a 1-3/4” diameter hole and in panels from 17 gauge to 3/16” thick. The indicator is constructed of 316 stainless steel and satisfies NACE MRO175 standard. Specifications Operating pressure ranges   Working pressure 250 psig Proof pressure 500 psig Cv .035 Operating temperature ranges   Ethylene Propylene seal -65° to 300°F (-53° to 148°C) Buna-N seals -40° to 250°F (-40° to 121°C) Viton seals -20° to 450°F (-29° to 232°C) Ordering Information 1/8 NPT Connection 1/4 NPT Connection Viton Buna-N Ethylene Propylene Viton Buna-N Ethylene Propylene 433774 433774-A 433774-EPDM 433775 433775-A 433775-EPDM

 

Inline Filters

The Pneu-Hydro bar stock component filter uses a minimum number of parts for economy and reliability. It has a strong, durable element, with a large surface area that reduces the need for frequent cleaning or replacement. A unique assembly retains the filter element solidly, preventing flutter; yet it is easily removed for cleaning or replacement. It will not contribute to system pulsation. A variety of filtration ranges are available.
The 316 stainless steel filter element and Teflon gasket permit use with a wide variety of corrosive fluids.

Specifications

Operating pressure ranges
System pressure
Brass	3,000 psig maximum
Stainless steel	6,000 psig maximum
Maximum psid	1000 across filter element (psid increases as filter collects contaminants)
Operating temperature ranges
Temperature range	-65° to 450°F (-53° to 148°C)

Ordering Information

Inlet and Outlet Connections	Dimensions (inches)		Filtration Area (inches)	Model Numbers
	L	H (across Hex flats)		Brass	316 Stainless
1/4 NPT Female	2-11/16	3/4	1.5	501F4B	501F4Q
1/2 NPT Female	3-17/32	1 1/8	2.7	501F8B	501F8Q

Filter Elements

The filters listed above are supplied with the proper elements for use at specific ranges of filtration. To order a desired range, add the indicated suffix number to the basic model number. To order replacement elements, use the element part number. (Filter elements are 316 stainless steel.)

Nominal Filtration Range (m) For 3/4 Hex Housings For 1 1/8 Hex Housings Suffix Number Element Part No. Cv Element Part No. Cv 5 - 10 592947-2 .25 592946-2 .40 2 10 - 20 592947-3 .50 592946-3 .80 3 50 - 75 592947-6 .90 592946-5 1.15 5 592946-6 1.5 6

Example: Model No. 501F4B-2 designates a 1/4 NPT female thread brass housing with element for 5 - 10 micron filtration.

 

O-Ring Tool Kit

This kit of specially designed tools for installing and extracting O-rings consists of:

• Jogging and installation tool
• Jogging and removal tool
• Flat face prying tool
• Pointed prying tool
• Piercing tool
• Prodding tool
• Tweezers

The items are invaluable to engineers, technicians, and assembly personnel working on pneumatic, hydraulic and other fluid handling devices. They are fabricated from corrosion-resistant materials for compatibility with most fluids and may be used in clean-room applications.
Tools are packaged in an attractive plastic pouch with pockets to separate the various items.

Ordering Information

Part No.	Deion
001-ZOZ	316 stainless steel tools