If a directional valve (not shown in the picture) is shifted into position that lowers the load, then the fluid from the rod chamber of the cylinder can exit only if pressure at port P (pilot pressure) and port L (load pressure) create enough force to overcome the spring force and open the valve. 0000020043 00000 n The respective high pressure is balanced and fed to the brake release valve (pressure reducing valve) via the shuttle valve. Cylinders with external forces such as weight from a platen, machine members, or tooling acting against them will overrun when … CB - Counterbalance Valves Application Notes A typical circuit application for a counterbalance valve contains a pump, directional control valve, and an actuator. %PDF-1.4 %���� Sun’s family of vented counterbalance valves is insensitive to back pressure at port 2. Cartridge Style Counterbalance Valve. COUNTERBALANCE VALVE, FREE REVERSE 10 GPM 20 GPM 35 GPM C0825 C1025 C1225 8-051.0 8-052.0 8-053.0 DCBA-08 DCBA-10 DCBA-12 DUAL COUNTERBALANCE VALVE … 0000001848 00000 n 0000002021 00000 n 0000016336 00000 n 0000128516 00000 n 0000004403 00000 n 21+4 bar. 0000140180 00000 n 3��LY2��-��݅�݅���;twtppptppp�����������G�E�E���Q�(r�9�e�"Gy��M��K&���*�*��3�̾��ʾ��ʾ��ʾ���}=�z:{8{:{8{:{8{:{8{:{8{:{8{�y������5��/��C�׾j�1�-�l�e/a�C����8�� 0000058411 00000 n 0000005282 00000 n 0000005795 00000 n There are many options, and few people really understand them all. xref �m�IHT�E�pI-ق�(6r9�M؊p'��a§?b������ �Df��"A6��M��!H��(��%i���Ӗ!���J~�g�aՉN�g�DN����f�~���1J>m������T@����x�ॆ���7{�+FN���Y�E\�,���L�IY�փ&�?���:n���y�)s��vЗ��íθ��7�b��b[�!i_�v&[� 0000081354 00000 n The counterbalance valve will hold a load in position until pressure or an external force is applied to move the load. The following illustration shows a counterbalance valve schematic. 0000004389 00000 n �d��������p�`�p�`�p�`�0_�/�d 0000117525 00000 n If a directional valve (not shown in the picture) is shifted into position that lowers the load, then the fluid from the rod chamber of the cylinder can exit only if pressure at port P (pilot pressure) and port L (load pressure) create enough force to overcome the spring force and open the valve. F E A T U R E S 888-99FORCE www.forceamerica.com Hydraulic Valves Line-Mounted Counterbalance The counterbalance valve cartridge is available in multiple ratios. H��W[k7~�_�G�teit�h�PZ4�З�w9I�;N����͌��Ħ4>�䀣oV���Fcn�;oF���`�8S�R�S���Ӗ��p*؜�%j�쉖�'�)+�\��u���̻��v�m�fG� ���L ���mx������M���� �bs(��f"�s���`����K�o���Cq�|� ��������/ZW� Quick Reference Counterbalance Valves Catalog Hydraulic Vent CB10-HV OPERATION CB10-HV : Counterbalance valve, 10-size, hydraulic vent. 0000005369 00000 n 0000005595 00000 n 0000006023 00000 n Last week, we had some trouble with a pilot operated check valve: https://www.youtube.com/watch?v=Frn3f1WZdLM. ��Q2���=r�>r��%CR��6�1�a��֌�U}�}�U�`nEҀ���$mC�]���K�G����)�Zm����:7�`�P�}� `C�}���^�%��14$BA���x�JC>����RBJ��=FҒe�4i�_�h�hH�\� �F� YJh�(���&NR��m)+k������"����O!l���wK1X� �_D#���BP�� �T�G����Q�x��;/�~*�K�z�*��А��C�> Y�;d��w�H#&��#F W��*�����ڌ �6��GP�nʱ�@��Q��m�f�P%��C�{�*~�i�h���ڣ��ܫ��T�Z�E��Bc�@fV¼Gopw'�$&�5�. 0000141688 00000 n 264 0 obj <> endobj Counterbalance valves Cartridge Valves Technical Information Counterbalance valves 520L0588 • Rev DA • June 2010 9.3 Introduction Quick reference Index Application notes Application notes A counterbalance valve provides several 63�CE�fp|}�t�5|�8�?i& vbkN�D ����:�ʛ�sv2�f� �x� endstream endobj 1279 0 obj <>/Filter/FlateDecode/Index[76 1143]/Length 53/Size 1219/Type/XRef/W[1 1 1]>>stream HYDAC counterbalance valves are direct acting poppet valves with integrated check valve which enable a jerk-free movement on the part of consumers in the presence of over-centre loads.あなたは私たちのモバイル最適化さ Dual counterbalance RE 18307-73 Edition: 03.2016 Replaces: 07.2012 Flow Q Pressure Δp A-VBSO-DE-30-FCB-PI 08.48.12 - X - Y - Z Technical data Max. 0000007583 00000 n C 11-1 • This is a direct acting type pressure adjustment valve and Pressure Control Valvesdepending on the internal or external pilot pressure and drain combinations can be used as sequence, counterbalance, relief, or unload valves. ŷY��M7�1����mz)>:�1}�B?�]����G�'�drY>q�S�S���1E�^���J��S���;����,y��]ΣT+��EJJ&ii` �R�%--� 0000004319 00000 n 0000003564 00000 n 0000007699 00000 n 0000009763 00000 n During extension, the total inlet flow to the cylinder (Qt) is sum 0000049963 00000 n %%EOF 0000002227 00000 n /�E�ؾ���� ���h�iH���$9�J��J����|no����T��o�Cԩn�>^�[_Fu��I�QU]����K�����:�˾9��r��_������˺j��5I�U���^~�W�n]�7^b3�L�V����Eߊ�{q�*�{�W��z����|��y�23k”m�]Qƾh�1Yf�g����JbS�w}����T�)��v;ޞe&[�$����6�ʡw��@;(�Ig���d�DKMK� y�B�Ԗ���� 0000134649 00000 n 0000134911 00000 n 0000137023 00000 n COUNTERBALANCE VALVE REXROTH PDF - You are here: Home > Products > Product Groups > GoTo Products > GoTo Hydraulics > Compact Hydraulics > Counterbalance valves - … This pressure acts on the differential area, and the force generated is counteracted by the bias spring. Turning the adjusting screw clockwise will increase the load carrying capacity of the valve. 0000121479 00000 n These valves are used for • Precise control of overrunning loads • Positive load holding in any position • Protection from pump cavitation 0000079914 00000 n As the valve is set to a certain pressure (Pt), once the load induced pressure nears this setting, the valve starts to open, lowering the load (the valve, in this 0000017267 00000 n �ǔz�Ț��P���\M��QRP�l�ч�ǵ�5j(r�Ж����#��)�K� %>&}��N���퐲b�T��� ~�ٜ�?��� �@�H endstream endobj 1231 0 obj [/Separation/Rot/DeviceCMYK<>] endobj 1232 0 obj <> endobj 1233 0 obj <>stream 0000001362 00000 n endstream endobj 314 0 obj <>/Size 264/Type/XRef>>stream 0000002967 00000 n 0000012041 00000 n 0000011896 00000 n 0000050287 00000 n 0000020344 00000 n 0000121655 00000 n The valve body is available with different port sizes and thread types. 2/12 Bosch Rexroth AG Counterbalance Valve BVE Series 51 RE 95525/11.11 Valve type 01 Counterbalance valve, single-side BVE Size (NG) 02 Flow, nominal q v nom 320 l/min, at Δp = 20 bar 25 Control range (pressure when counterbalance spool starts/stops opening) COUNTERBALANCE VALVE, FREE REVERSE 10 GPM 20 GPM 35 GPM C0825 C1025 C1225 8-051.0 8-052.0 8-053.0 DCBA-08 DCBA-10 DCBA-12 DUAL COUNTERBALANCE VALVE … 0 Its function is to �i�t�O��4U�N���D�N�ޮ�AYe;A�)*�f�&Ԛ��)h-� �M�¼�@M!��V�9l���Ѵ]�H��8n'@N�V�7p�������( �c��5ow4��6�3"��1l�=�kdB�1Z+���-�^������D�]�����~#���_#�r:��w���]�|�e�(KhM6+�i��\��ej�U����߾��㫵d�R2�~9�ܿ���Ǘ޼ݻs� �0�L��CQ56�Πg���ߵ�\�_/�t�[yAqP�S� ׇCQ4wQK�ă�'�� Tڋ�xY�㳟��z�؞F��:��V8�2�RL(59�{gR��a��U�:cj��v���Z���w�\�X�o���ZI�f�f���l7�4���` }�a2Z@A͜9�T����]\(�!m�����d�\c�V�R�����]0���L��� ȳG��>y��YaD�G[�R�?m�q�����XRw�aX�Kk2�r�,m��>�[DI�o��9��F;�u����ix�۶�u"IPiS�{���f)>��y��Μ��4�|�[!4%l�X)rB��w�4��ͯ� �p�� endstream endobj 1234 0 obj <>stream counterbalance valve is closed. The v alv es are m ade o f s teel AV-PB (9 SM hPb2 8 o r 3 2 ) o r o f Ng2 Pb (1 6 NC r4 ) fo r the 0000121684 00000 n Pressure adjustment from 1000 to 5000 PSI. 0000005053 00000 n 0000022577 00000 n 0000058754 00000 n counterbalance valves again follow the instructions above. 0000003797 00000 n operating pressure 410 bar (5945 psi) Max. To overcome a spring force of 1,800 lb, the pressure would have to build to 1,800 psi. ��~�{�u]?�3����)��� �$6 endstream endobj 1223 0 obj <> endobj 1224 0 obj <>stream 0000001995 00000 n 0000084977 00000 n Inlet pressue The counterbalance valve is a pressure control device and functions as follows: Pressure is developed at the Work Port of the holding valve when the actuator is pressurized. 0000019729 00000 n 0000079469 00000 n a%i�Tl1,z����1R���u�5 Tp��L6ǁ='Q!|W�2�Z��G;n2�WN|6� MODELS 1/2 NPFT 3/4 NPFT No Manual Release B81C00 … 0000009086 00000 n 0000014672 00000 n 315 0 obj <>stream trailer <<23F3FF1D08BC4B01A81764245C8FCA9F>]/Prev 630273/XRefStm 2021>> startxref 0 %%EOF 1280 0 obj <>stream 0000002983 00000 n 3.27). The following illustration shows a counterbalance valve schematic. 0000128784 00000 n 0000050217 00000 n 0000014771 00000 n 0000009734 00000 n o r in the integrated blo ck. Walvoil S.p.A. - Headquarters Direzione e Coordinamento Interpump Group Spa Via Adige 13/D 42124 Reggio Emilia - ITALY Tel. #��@A_�V�^�@�-x���Flb9 ��RV}p���1T�p� � p� �(��塠r\]ey (�s2�\%WU-��@��ř�@��R�~+����U3Ү ot���m�ѐ�`q�0r�0)�4�M|��\2�s#��և�G�,�z(1�^ �_Ag�i�>,�.^u��� =/[nڀ� ���6{=4p���}GV'Z�����ᘭ��mA3�R �F�64ZKc�`¯0�+jn~!�D]=��&HULj^�����e��!���ƃ瘵��1�W��l�d/�uC�΍#>O"v�ϓ���WRI��F��eҡ����`۪��Җ���n[%��KI�lP=�׎�%����T���"�ϴ��A���LvD��J�>;��mO[�m��3�rȱ��"@{"s�_/�����F�>W����� �'ߓ�.|q��$�O�X?����{$��Po�#��j�0�@Ē��#-���5[*�rc��+��@��W��D��rY��b��j�(��? Counterbalance valves Prev. 0000121203 00000 n h�b``�b``/a`c`�8� Ȁ �@1v� �m� 0000003520 00000 n the counterbalance valve the cylinder annular (rod) side and, since it has pressure both upstream and downstream, it needs to be of the “fully balanced” or CCAP type. ������2ꔔ�-�L�'�@��c�O m��`I~�,� ����42D0l-` `ݰ�a�&�����_5�3�t0(*̜[]��0����v6� !1;��OP=��(dt��������%=6�ӯ�p.ຠ��� ƨ�p�yK�f�5 C11312 has NPT threads C11314 has SAE threads – Load Holding 0000005483 00000 n F#���Ho�5���O�g�3�Y����Ap08��� 8���`p���Ap0�RR�-��ԖSN�r*©X��l�!�������9�,~?����b�o��ad1rY��q��{�}z���G���+��i�Ѯ�]G��v�z�u��{q�F#�Q��a0r�F#�Q��a0r�dِe=M0&㝛��L��3=l���v|�1�"zl�i%��S=�]y��q���u�q�v�����]۩��'�'� ;H� endstream endobj 1235 0 obj [1257 0 R] endobj 1236 0 obj <> endobj 1237 0 obj <> endobj 1238 0 obj <>stream D��\Y!TI���oJ����|�Q� �e�[BE|����1�aT cB"�DŽ Y ������I N�Z cA���� �#&-�Y�N�ȭ�a6�yA�3�rJ5�_t=�:>�m�@�Q����g�{*x��:k�!�J���l!|Hy�-�@q�oz>(�z�(:�d��ڊ8 CG�O�r׵ In this way the load keeps its position. To help prevent shock damage, a restriction may be added between the cylinder and the counterbal-ance valve. CAUTION Counterbalance valves are not relief valves or energy-saving devices. 0000005908 00000 n Hydraulic Counterbalance Valve Application The counterbalance valve, also called a holding valve, is used to prevent a weight from falling uncontrollably. H�\��n�0E�|��������VB���JYL[Mf>���A� r�"?�ܪ�&R�C��;p��ջ��M��vfs�.��x�m0�p�lU��o�ϣ�=7S�����e��p��2��t�2Ǜ��t�!�g�{�B쇓����ߛ|������f�6]8����֜�ɗe�.����CZ���_�)�r9^Q��p��6�f8��*�km���Zga��;����&fU�?E�J�"��%�?��O�'������B~���Le9�b��,�Y��,fYK�`!ؑX� (16 gpm) Weight see “Dimensions” Manifold material Zinc plated steel Flange seal kit 1) E00000000000014 (R930005947) -�E��HO)CHZȢ���|�c+Cc�Y���]���!�r^��mv�]�M6�HC���=v}��e��&�C. 0000017688 00000 n 0000003821 00000 n 0000019879 00000 n 0000013578 00000 n 0000028028 00000 n Learn how a counterbalance valve works! H��W[k\7~?�B�N��J�;�<8qC[-^�C���I;�.��ߌtt��>d[(�W߬4�o.��.>^~0ϟ��_~��X���髗f:�O�ȟ3���k��1��{��]6s����B>���trf�������9���w�P�P��䋪�T�'~Z'?������:9!�s�r >q��_�߯ʿ}�������/�w?�\�~{}�����9��z�nj�W�9�e�,�h�͇N�mD:!�n��1Z�~3L�s0\3%(*����rag��p;��S2W��c.Tkv�A���`�'�}�r�P�n��0�Wr����)r�Ѿ8L��|X7G��E2�h�١i�aiH�#C���-v���������T��_�SI�����=fM|�w�;����J�?�1HJ�ا�!c3H 0000013464 00000 n 0000103536 00000 n Photo above shows the counterbalance valves location. x�b```f``�����`��A�X����c��Mu�J1� fE��+�&-}]�~�����T�x�kXZFGGD��5 @1�4?���l�9�2�3T0�0�`m�Vbc)�)��*�����?A���QH�F*��m��L��I�E���0F 00�k�k��h���i�(кYl�p�������揀��00e�Ҍ@� � �5� Counterbalance valves The fourth and last normally closed pressure control valve found in hydraulic circuits is the counterbalance valve. 0000010381 00000 n 0000103288 00000 n Features • Sealed spool type design for improved stability and accuracy as well as low leakage • Low leakage poppet-type • 0000117861 00000 n Do not use counterbalance valves with closed-center directional control valves. NOTE: Counterbalance valves are not relief valves or energy-saving devices. 0000005544 00000 n With this counterbalance valve design, the back-pressure Pv at port V2 is additive with the ratio 1 : 1 to the relief setting Pt and with the ratio (R + 1) / R to the theoretical pilot pressure Ppil for piloted opening. 8 Counterbalance Setting (1CEL30 based options only) bar in 10 bar increments. H�\��n�0F�y This opens from about 10 bar and reduces the respective working pressure to approx. 0000084297 00000 n Counterbalance valve with shuttle valve, brake release valve for pressure reduction and port Br (plugged). 1219 0 obj <> endobj xref 1219 62 0000000016 00000 n Counterbalance valves with pilot assist are meant to control an overrunning load. 0000055285 00000 n 0000079649 00000 n startxref 0000007420 00000 n 0000081105 00000 n 47- A - 1, Honga Industrial Area, Belgaum - 591113, Dist. trailer 0000084456 00000 n 0000008130 00000 n Cc�.I��_��)���|�0������k��(�`�UF �!+ӗ��Մ$�l_F>���XM��W��w��WLO�:'�D2T�ET�|���Ƚ���zvQsFv�(��u��B�R�]�T��F���H��2?�V*�܊�M#� It is … A counterbalance valve will re-set and lock system pressure in the cylinder irrespective of the load-induced pressure. 0000001536 00000 n endstream endobj 265 0 obj <>/ViewerPreferences<>/Metadata 11 0 R/Pages 10 0 R/StructTreeRoot 13 0 R/Type/Catalog>> endobj 266 0 obj <>/ProcSet[/PDF/Text]/Properties<>>>/ExtGState<>>>/Type/Page>> endobj 267 0 obj <> endobj 268 0 obj <> endobj 269 0 obj <> endobj 270 0 obj <>stream �� g�� endstream endobj 1225 0 obj <> endobj 1226 0 obj <> endobj 1227 0 obj <> endobj 1228 0 obj <> endobj 1229 0 obj <> endobj 1230 0 obj <>stream 0000121983 00000 n CAUTION: Counterbalance valves can be damaged by severe decompression shock. 0000117776 00000 n counterbalance valve for these dynamic systems presents a challenging task. 0000103606 00000 n %PDF-1.4 %���� To help prevent shock damage, a restriction may be added between the cylinder and the counterbalance valve. �L�ۀ=�/���"iA�l��8��f���(�� �ֺ� 0000005710 00000 n 0000059193 00000 n 0000103834 00000 n Hydraulic schematic on next page this is only use this drawing as a reference as there may be some differences on your specific machine. The line connected between the counterbalance valve and cylinder’s rod-end port acts on a small piston area (1 in. 0000010229 00000 n 0000024292 00000 n Counterbalance Valve RS08-01 is a compact cartridge design with operating pressure up to 5000 psi (350 bar) and flow rate up to 10 gpm (38 l/min). Inlet pressue rating of aluminum body is 3000 PSI. 0000103807 00000 n h���1 0ð4��u\Gag&`�'MF[����!�ߞ /a endstream endobj 1220 0 obj <>/Metadata 74 0 R/PageLabels 71 0 R/Pages 73 0 R/StructTreeRoot 76 0 R/Type/Catalog/ViewerPreferences<>>> endobj 1221 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB]/XObject<>>>/Rotate 0/StructParents 1/TrimBox[0.0 0.0 595.276 841.89]/Type/Page>> endobj 1222 0 obj <>stream 0000117705 00000 n Pressure adjustment from 1000 to 5000 PSI. <]>> 0000018941 00000 n 0000002510 00000 n 0000050455 00000 n H�\��j�0E�� CARTRIDGES Screw ty p e, they can be fitted directly into the cav - ity in the actu ato r (cy linder, m o to r, p u m p , etc.) As an example, consider a press with a two-ton platen (Fig. 0000004680 00000 n To prevent this, a counterbalance valve, sometimes called an over-center valve… E 5.933.2.1/11.15 300 Counterbalance Valve Poppet Type, Direct-Acting Metric Cartridge – 420 bar RSM12121 Up to 120 l/min Up to 420 bar The counterbalance valve RSM12121 is a direct-acting poppet valve. '`�`�g��>��k�7~F#p�y���^�~q6�i��k��툝�GHG�C�xG��� R��W�z?#��6ׯ_�2����T�h�A������8b�2p�w\|y��;��ӵc�mpZb':y� ����ԛI��PnA���楝��j@��J@��l��H�:�T�Q�!T S�^9��RsӠ�CRU��Np�t�!�&��w4�p���#. 0000085243 00000 n 0000015814 00000 n CB-03 Counterbalance Valve and BR-03 Brake Valve Combination Unit O-ring Mounting bolts Hex socket bolt, 36 across flats 127 . . (24.7) . 508 391 ( 12 69) 375 75 (32) 42 2-7/8 0000058727 00000 n Hydraulic valves and integrated components. Counterbalance valves can be damaged by severe decompression shock. 0000016365 00000 n This unit is a line mounting body fitted with 2 screw in cartridge style, direct acting, poppet type, adjustable, pilot assisted, hydraulic counterbalance valves with free reverse, sealed pilot port and spring-chamber connected to tank. 0000129224 00000 n 0000001666 00000 n 0000017399 00000 n 0000000016 00000 n 0000135229 00000 n 0000009898 00000 n This brake Counterbalance valve is also a type of normally closed valve which permits the flow of fluid in one direction but will offer resistance in fluid flow in other direction until pressure reaches up to a level at which valve opens. 0000016916 00000 n 2) inside the valve. 0000020016 00000 n When a cylinder is supporting a vertically mounted load, and its directional valve shifts to lower the load, the load may fall uncontrollably as its weight pushes fluid out of the cylinder. flow 60 l/min. 0000058065 00000 n 0000002393 00000 n This valve is 3-ported, externally piloted and low leakage. Counterbalance Valve, Hydraulic Vent, Pilot Port 1 Model No. Knowledge Base Article Type: Instructions CPM Counterbalance Valve Adjustments WARNING Never work on, clean or service this unit, control panel or any machine or open or remove any protective cover, guard, grate, door, or 0000117634 00000 n For additional information see Technical Tips on pages LM1-LM4. 0000016021 00000 n When the operator begins to lower the load, this stored energy gives the counterbalance valve the message that Model Name/Number: Counterbalance Valve Brand: CBF Hydraulics Counterbalance Valves Prezzure Hydraulics Belgaum Plot No. 0000049155 00000 n 0000012543 00000 n Hydraulic Valves Line-Mounted Counterbalance The counterbalance valve cartridge is available in multiple ratios. 0000081681 00000 n H�\�]k�@���+沽(Q��m!V[�b?Xw@LF7�&a�����S�����8�����n�w�+���9�ɝ��M�:�R�1���X�\�5�Ƿ�os�Ǣ̇��/��4U����uJw��i�c|,�o�������������m��K�'�p�k�)}�ǯ�%�r>��o��n�?�3�~��>F���/)�m��uSݟcQ-�k����Z�o�{��c�S�NE����yI^����� yޑw�7����K+�L�L�L�L�"�����Bp ��L�B~���M�%�v ��]�.a��K�%�v ���f��W�+�-y�&�M��6n"�$p��M=======�ܔ��|e�"_���W�+���|e�"_���W��A٥s�W쯯�W0�Q��G��r�>�}��1�ct68� �Fg�����lt68� �Fg�����lt�� 7W%�h�y�[J� 0000104169 00000 n 0000015678 00000 n x�bbbg`b``Ń3� ����0 �4 3 Port Sizes Code Port Size Housing Number Aluminium Steel ... An Eaton Brand EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 161.A F Where measurements are critical request certified drawings. 0000084385 00000 n When there is … Follow. `�p��q�|S�!pg����B���Og?�ބ/���_0'>M,8{>eգS)�é�KlN�~���V����9�8yar�Ÿ ��@{H�L��sL�9療��a�]��'���$^`#�3��U!�(\��H�$p�満��&�q����p$67.Q��|eZ������K�+���l�+p���Yt�OO��j����b��i�ާ��Y���l�j�B�#' ���Zzj�q 9�Ȍ���vj�.^�g\�(⋯�豣6y� ��U/H������+�'��>� Counterbalance Valve - Series ZNS The proven counterbalance valve series ZNS in size NG06 (CETOP 03) and NG10 (CETOP 05) enables a reliable operation by controlling the … Counterbalance valves are available as individual cartridges or standard cartridge-in-body (CIB) packages. )��xd}& H��WKo7�ϯб-0�(�z AvҠR�X=�4I��E�~?J����ȤIo��}��I��|)�����X�����k����L�O���������惛 &�Y@�}�K�N"�\"Q����$⳪#l�����g��Bq_5������ Ls�T�#-�#X���)F�����C.Ƃ��O%/ k��~�����^*(:JXd7XRh]u������UX dtl��;�L�ٗȷ��& ZV�����B���Dp^�L+��;� Back pressure may adversely affect the operation of a standard non-vented counterbalance as it directly increases the valve … 264 52 0000058341 00000 n The check section allows We reserve the right to change specifications without notice. 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